List of nuclides

This table of nuclides shows the 896 observed nuclides that either are stable or, if radioactive, have half-lives longer than one hour.

(A nuclide is defined conventionally as an experimentally examined bound collection of one or more protons and zero or more neutrons, that either is stable or has an observed decay mode.)

At least 3,000 nuclides have been experimentally characterized. Those not shown in this 896-member list all have decay half-lives less than 60 minutes.

Introduction

An additional row contains specific data on the type of decay of the nuclide. If a decay has been predicted theoretically but never observed experimentally, it is given in parentheses.

254 nuclides are considered stable; some of these could in theory decay through spontaneous fission, alpha decay, double beta decay, etc. with a very long half-life, but no radioactive decay has ever been observed. Some of these are indicated with a ">" number to show the lower time limit of the half-life known based on experimental observation. Such nuclides are considered to be "stable" until a decay has been observed in some fashion.

The next group is the radioactive primordial nuclides. Presently known are 34 of these, of which 29 have half-lives considerably longer than the age of the universe. Tellurium-123 most recently had been reported to be radioactive, but the same experimental group later retracted this report, and it presently remains observationally stable. The total list of 288 primordial nuclides starts with the stable nuclides and ends with the shortest-half-lived primordial nuclide, ²⁴⁴Pu, at position 288.

About 50 nuclides have half-lives too short to be primordial, but are nevertheless found in nature as a result of later production by natural processes. These are daughters of longer-lived nuclides (radiogenic nuclides), cosmic-ray reaction products (cosmogenic nuclides), or products of other natural nuclear reactions (nucleogenic nuclides).

The remaining radionuclides listed are artificially produced. Some, such as caesium-137, are found in the environment only as a result of contamination from man-made nuclear fission product releases (nuclear weapons, nuclear reactors, and other processes).

All the radionuclides, starting with the longest-lived primordial radionuclides, are sorted by decreasing half-life, given in seconds. For more convenient units, half-lives must be divided by the corresponding number of seconds in the time unit (for example, half-life in seconds must be divided by 31,556,926 to obtain half-life in years).

Summary table for numbers of each class of nuclides

This is a summary table^[1] of decay class for the 902 nuclides with half-lives longer than one hour, given in this list of nuclides. Numbers may change slightly in the future, as nuclides radioactive only in theory are observed to be radioactive, half-life measurements improve, or new isotopes are discovered.

254 of these 896 nuclides are considered stable. This number is subject to change as some of these 254 might be determined to be very long-lived radioactive nuclides in the future.

The remaining 642 radionuclides with half-lives longer than 1 hour, have half-lives that are well-characterized. They include 29 nuclides with measured half-lives longer than the estimated age of the universe (13.8 billion years), and another 5 nuclides with half-lives long enough (> 80 million years) to be primordial, and may be detected on Earth, having survived from their presence in interstellar dust since before the formation of the solar system, about 4.6 billion years before the present. Together, these constitute the known 34 radioactive primordial nuclides.

Another ~51 short-lived nuclides can be detected naturally as daughters of longer-lived nuclides (radiogenic nuclides), cosmic-ray reaction products (cosmogenic nuclides), or products of other natural nuclear reactions (nucleogenic nuclides). This gives a total of about ~ 339 naturally occurring nuclides. The remaining known nuclides listed, are known solely from artificial nuclear transmutation.

Stability class	Number of nuclides	Running total	Notes
Stable nuclides	254	254
Radioactive primordial nuclides.	34	288	Total primordial elements include bismuth, uranium, thorium, plutonium, plus all stable elements.
Radioactive non-primordial, but naturally occurring on Earth.	~ 51	~ 339	Carbon-14 (and other isotopes generated by cosmic rays); daughters of radioactive primordials, such as francium, etc.
Radioactive synthetic (half-life > 1 hour).	>557	>896	Includes most useful radiotracers. The 896 nuclides with half-life >1h are listed in this article; there are some more short-lived natural isotopes.
Radioactive synthetic (half-life < 1 hour).	>2404	>3300	Running total includes all well-characterized synthetic nuclides.

List legends

no (number)

A running positive integer for reference. Especially for nuclides with short half-lives, this number, i.e. position in this table, might be changed in the future.

nuclide column

Nuclide identifiers are given by their mass number A and the symbol for the corresponding chemical element (implies a unique proton number). In the rare case that this is not the ground state, this is indicated by a m for metastable appended to the mass number.

energy column

The column labeled "energy" denotes the energy equivalent of the difference between the mass per nucleon of this nuclide and the mass of a neutron (so all nuclides get a positive value) in MeV, formally: m_n − m_nuclide / A.

half-life column

All times are given in seconds (3.1556926×10⁷ s = 1 year). Entries starting with a ">" indicates that no decay has ever been observed, with null experiments establishing lower limits for the half-life. Such elements are considered stable unless a decay can be observed (establishing an actual estimate for the half-life).

decay mode column

α	α decay
β^−	β^− decay
ε	electron capture
β^+	β^+ decay
SF	spontaneous fission
β^−β^−	double β^− decay
β^+β^+	double β^+ decay
IT	isomeric transition
p	proton emission
n	neutron emission

Decay modes in parentheses are still not observed through experiment but are, by their energy, predicted to occur.

decay energy column

Multiple values for (maximal) decay energy are mapped to decay modes in their order. The decay energy listed is for the specific nuclide only, not for the whole decay chain. It includes the energy lost to neutrinos.

Stable nuclides

In theory, spontaneous fission is possible for all elements with atomic numbers >40, but has not been observed for most elements up to lead (82). The list separates nuclides unstable only to this fission mechanism, from the rest of the nuclides following, which are unstable to additional mechanisms.

no	nuclide	A	Z	N	energy	half-life	decay mode	decay energy (Mev)
1	^56Fe	56	26	30	9.153567
2	^62Ni	62	28	34	9.147877
3	^60Ni	60	28	32	9.145862
4	^58Fe	58	26	32	9.142938
5	^52Cr	52	24	28	9.137037
6	^57Fe	57	26	31	9.127119
7	^59Co	59	27	32	9.126046
8	^54Cr	54	24	30	9.125633
9	^61Ni	61	28	33	9.124129
10	^55Mn	55	25	30	9.120611
11	^64Ni	64	28	36	9.119754
12	^66Zn	66	30	36	9.115258
13	^53Cr	53	24	29	9.114435
14	^63Cu	63	29	34	9.112272
15	^65Cu	65	29	36	9.106154
16	^68Zn	68	30	38	9.100845
17	^50Ti	50	22	28	9.099861
18	^51V	51	23	28	9.094884
19	^67Zn	67	30	37	9.084468
20	^48Ti	48	22	26	9.081488
21	^72Ge	72	32	40	9.079465
22	^70Ge	70	32	38	9.079372
23	^69Ga	69	31	38	9.076078
24	^88Sr	88	38	50	9.070438
25	^74Ge	74	32	42	9.063522
26	^49Ti	49	22	27	9.062323
27	^76Se	76	34	42	9.061485
28	^71Ga	71	31	40	9.059218
29	^78Se	78	34	44	9.058842
30	^90Zr	90	40	50	9.057631
31	^89Y	89	39	50	9.056743
32	^86Sr	86	38	48	9.054160
33	^82Kr	82	36	46	9.054126
34	^84Kr	84	36	48	9.052649
35	^73Ge	73	32	41	9.048006
36	^87Sr	87	38	49	9.046964
37	^75As	75	33	42	9.045093
38	^80Kr	80	36	44	9.044984
39	^77Se	77	34	43	9.040153
40	^85Rb	85	37	48	9.037998
41	^91Zr	91	40	51	9.037156
42	^83Kr	83	36	47	9.034966
43	^79Br	79	35	44	9.034220
44	^81Br	81	35	46	9.033979
45	^92Zr	92	40	52	9.032783
46	^46Ti	46	22	24	9.030532
47	^47Ti	47	22	25	9.027336
48	^44Ca	44	20	24	9.013793
49	^42Ca	42	20	22	8.989116
50	^38Ar	38	18	20	8.984870
51	^45Sc	45	21	24	8.983945
52	^43Ca	43	20	23	8.964551
53	^34S	34	16	18	8.951675
54	^40Ar	40	18	22	8.947325
55	^41K	41	19	22	8.938623
56	^39K	39	19	20	8.938174
57	^37Cl	37	17	20	8.929760
58	^36S	36	16	20	8.923108
59	^35Cl	35	17	18	8.900285
60	^30Si	30	14	16	8.885761
61	^32S	32	16	16	8.884318
62	^33S	33	16	17	8.876964
63	^31P	31	15	16	8.859744
64	^28Si	28	14	14	8.838935
65	^29Si	29	14	15	8.826327
66	^27Al	27	13	14	8.708242
67	^26Mg	26	12	14	8.694981
68	^24Mg	24	12	12	8.651911
69	^25Mg	25	12	13	8.599047
70	^23Na	23	11	12	8.485675
71	^22Ne	22	10	12	8.436087
72	^20Ne	20	10	10	8.423422
73	^16O	16	8	8	8.367390
74	^21Ne	21	10	11	8.344280
75	^19F	19	9	10	8.149612
76	^17O	17	8	9	8.118904
77	^18O	18	8	10	8.114744
78	^12C	12	6	6	8.071327
79	^15N	15	7	8	8.064594
80	^14N	14	7	7	7.866827
81	^13C	13	6	7	7.830943
82	^4He	4	2	2	7.465077
83	^11B	11	5	6	7.283337
84	^10B	10	5	5	6.866257
85	^9Be	9	4	5	6.810483
86	^7Li	7	3	4	5.941599
87	^6Li	6	3	3	5.723527
88	^3He	3	2	1	3.094327
89	^2H	2	1	1	1.503327
90	^1H	1	1	0	0.782327
91	^94Mo	94	42	52	9.011856		(SF)	< 4.485
92	^93Nb	93	41	52	9.009051		(SF)	< 0.943
93	^96Mo	96	42	54	8.996229		(SF)	< 5.771
94	^95Mo	95	42	53	8.994564		(SF)	< 4.531
95	^97Mo	97	42	55	8.973806		(SF)	< 6.226
96	^98Ru	98	44	54	8.971572		(SF)	< 11.690
97	^100Ru	100	44	56	8.963517		(SF)	< 13.634
98	^99Ru	99	44	55	8.956348		(SF)	< 12.368
99	^102Ru	102	44	58	8.944837		(SF)	< 12.049
100	^101Ru	101	44	57	8.942117		(SF)	< 13.205
101	^104Pd	104	46	58	8.930847		(SF)	< 18.969
102	^103Rh	103	45	58	8.925910		(SF)	< 15.462
103	^106Pd	106	46	60	8.919460		(SF)	< 16.806
104	^105Pd	105	46	59	8.913356		(SF)	< 18.247
105	^108Pd	108	46	62	8.900253		(SF)	< 16.102
106	^107Ag	107	47	60	8.897514		(SF)	< 20.512
107	^110Cd	110	48	62	8.892718		(SF)	< 22.486
108	^109Ag	109	47	62	8.885300		(SF)	< 19.241
109	^112Cd	112	48	64	8.880077		(SF)	< 20.733
110	^111Cd	111	48	63	8.875445		(SF)	< 21.883
111	^114Sn	114	50	64	8.865722		(SF)	< 27.965
112	^113In	113	49	64	8.862212		(SF)	< 24.281
113	^116Sn	116	50	66	8.860362		(SF)	< 25.905
114	^115Sn	115	50	65	8.854249		(SF)	< 26.791
115	^118Sn	118	50	68	8.848073		(SF)	< 23.815
116	^117Sn	117	50	67	8.843977		(SF)	< 25.334
117	^120Sn	120	50	70	8.830537		(SF)	< 21.824
118	^119Sn	119	50	69	8.828201		(SF)	< 23.140
119	^121Sb	121	51	70	8.811783		(SF)	< 25.718
120	^122Te	122	52	70	8.811606		(SF)	< 30.974
121	^124Te	124	52	72	8.801364		(SF)	< 28.221
122	^123Sb	123	51	72	8.796727		(SF)	< 23.454
123	^126Te	126	52	74	8.786126		(SF)	< 26.011
124	^125Te	125	52	73	8.783505		(SF)	< 26.966
125	^128Xe	128	54	74	8.773359		(SF)	< 35.047
126	^127I	127	53	74	8.771981		(SF)	< 29.961
127	^130Xe	130	54	76	8.762725		(SF)	< 32.483
128	^129Xe	129	54	75	8.758904		(SF)	< 33.947
129	^132Xe	132	54	78	8.747695		(SF)	< 30.885
130	^131Xe	131	54	77	8.746253		(SF)	< 31.140
131	^134Ba	134	56	78	8.735133		(SF)	< 40.520
132	^133Cs	133	55	78	8.733515		(SF)	< 34.753
133	^136Ba	136	56	80	8.724908		(SF)	< 38.041
134	^135Ba	135	56	79	8.722072		(SF)	< 39.357
135	^137Ba	137	56	81	8.711628		(SF)	< 35.722
136	^138Ba	138	56	82	8.710904		(SF)	< 34.302
137	^140Ce	140	58	82	8.700494		(SF)	< 43.633
138	^139La	139	57	82	8.698892		(SF)	< 38.944
139	^141Pr	141	59	82	8.681405		(SF)	< 48.450
140	^142Nd	142	60	82	8.676646		(SF)	< 53.264
141	^156Gd	156	64	92	8.536342		(SF)	< 71.541
142	^157Gd	157	64	93	8.522478		(SF)	< 70.531
143	^158Gd	158	64	94	8.518775		(SF)	< 70.965
144	^159Tb	159	65	94	8.508680		(SF)	< 74.878
145	^163Dy	163	66	97	8.478607		(SF)	< 79.055
146	^164Dy	164	66	98	8.473604		(SF)	< 79.499
147	^54Fe	54	26	28	9.113040		(β^+β^+)	0.6800
148	^58Ni	58	28	30	9.109736		(β^+β^+)	1.9258
149	^74Se	74	34	40	9.047175		(β^+β^+)	1.2094
150	^80Se	80	34	46	9.043326		(β^−β^−)	0.1339
151	^86Kr	86	36	50	9.039532		(β^−β^−)	1.2556
152	^84Sr	84	38	46	9.031375		(β^+β^+)	1.7867
153	^92Mo	92	42	50	9.014860		(β^+β^+)	1.6491
154	^94Zr	94	40	54	8.999698		(β^−β^−)	1.1440
155	^98Mo	98	42	56	8.970426		(β^−β^−)	0.1125
156	^96Ru	96	44	52	8.967911		(β^+β^+)	2.7188
157	^102Pd	102	46	56	8.933337		(β^+β^+)	1.1720
158	^104Ru	104	44	60	8.918337		(β^−β^−)	1.2997
159	^36Ar	36	18	18	8.911105		(β^+β^+)	0.4335
160	^110Pd	110	46	64	8.874500		(β^−β^−)	1.9997
161	^112Sn	112	50	62	8.862944		(β^+β^+)	1.9222
162	^122Sn	122	50	72	8.808590		(β^−β^−)	0.3661
163	^124Sn	124	50	74	8.782914		(β^−β^−)	2.2870
164	^126Xe	126	54	72	8.779010		(β^+β^+)	0.8973
165	^143Nd	143	60	83	8.658792		(α)	0.5214
166	^144Sm	144	62	82	8.640577		(β^+β^+, α)	1.7811, 0.0761
167	^145Nd	145	60	85	8.632963		(α)	1.5784
168	^146Nd	146	60	86	8.625649		(β^−β^−, α)	0.0702, 1.1822
169	^148Nd	148	60	88	8.594388		(β^−β^−, α)	1.9288, 0.5986
170	^150Sm	150	62	88	8.585043		(α)	1.4495
171	^152Sm	152	62	90	8.563227		(α)	0.2203
172	^153Eu	153	63	90	8.550893		(α)	0.2736
173	^154Gd	154	64	90	8.549985		(α)	0.0812
174	^154Sm	154	62	92	8.541857		(β^−β^−)	1.2510
175	^155Gd	155	64	91	8.536341		(α)	0.0812
176	^156Dy	156	66	90	8.523443		(β^+β^+, α)	2.0108, 1.7579
177	^158Dy	158	66	92	8.516973		(β^+β^+, α)	0.2833, 0.8748
178	^160Dy	160	66	94	8.506816		(α)	0.4387
179	^161Dy	161	66	95	8.494067		(α)	0.3443
180	^162Dy	162	66	96	8.492234		(α)	0.0847
181	^162Er	162	68	94	8.480852		(β^+β^+, α)	1.8445, 1.6460
182	^164Er	164	68	96	8.473462		(β^+β^+, α)	0.0241, 1.3041
183	^165Ho	165	67	98	8.464689		(α)	0.1394
184	^166Er	166	68	98	8.462482		(α)	0.8309
185	^167Er	167	68	99	8.450350		(α)	0.6657
186	^168Er	168	68	100	8.446308		(α)	0.5527
187	^168Yb	168	70	98	8.437845		(β^+β^+, α)	1.4221, 1.9508
188	^169Tm	169	69	100	8.433931		(α)	1.2004
189	^170Yb	170	70	100	8.428792		(α)	1.7376
190	^170Er	170	68	102	8.424945		(β^−β^−, α)	0.6536, 0.0502
191	^171Yb	171	70	101	8.418182		(α)	1.5589
192	^172Yb	172	70	102	8.415864		(α)	1.3103
193	^173Yb	173	70	103	8.404023		(α)	0.9459
194	^174Yb	174	70	104	8.398624		(α)	0.7401
195	^175Lu	175	71	104	8.386589		(α)	1.6197
196	^176Hf	176	72	104	8.381427		(α)	2.2550
197	^177Hf	177	72	105	8.370139		(α)	2.2449
198	^178Hf	178	72	106	8.365958		(α)	2.0832
199	^179Hf	179	72	107	8.353293		(α)	1.8065
200	^180Hf	180	72	108	8.347930		(α)	1.2828
201	^181Ta	181	73	108	8.338961		(α)	1.5259
202	^185Re	185	75	110	8.308204		(α)	2.1947
203	^187Os	187	76	111	8.291746		(α)	2.7202
204	^188Os	188	76	112	8.290138		(α)	2.1426
205	^189Os	189	76	113	8.277599		(α)	1.9757
206	^190Os	190	76	114	8.275045		(α)	1.3784
207	^191Ir	191	77	114	8.263508		(α)	2.0839
208	^192Pt	192	78	114	8.260353		(α)	2.4181
209	^192Os	192	76	116	8.258202		(β^−β^−, α)	0.4135, 0.3622
210	^194Pt	194	78	116	8.250519		(α)	1.5045
211	^193Ir	193	77	116	8.250259		(α)	1.0173
212	^195Pt	195	78	117	8.239516		(α)	1.1581
213	^196Pt	196	78	118	8.237896		(α)	0.7942
214	^196Hg	196	80	116	8.233710		(β^+β^+, α)	0.8197, 2.0273
215	^197Au	197	79	118	8.229404		(α)	0.9545
216	^198Hg	198	80	118	8.227663		(α)	1.3833
217	^198Pt	198	78	120	8.222378		(β^−β^−, α)	1.0472, 0.0870
218	^199Hg	199	80	119	8.219805		(α)	0.8242
219	^200Hg	200	80	120	8.218848		(α)	0.7178
220	^201Hg	201	80	121	8.208956		(α)	0.3341
221	^202Hg	202	80	122	8.206703		(α)	0.1363
222	^203Tl	203	81	122	8.198230		(α)	0.9108
223	^204Hg	204	80	124	8.192358		(β^−β^−)	0.4163
224	^205Tl	205	81	124	8.187526		(α)	0.1567
225	^206Pb	206	82	124	8.186791		(α)	1.1366
226	^207Pb	207	82	125	8.179791		(α)	0.3915
227	^208Pb	208	82	126	8.175888		(α)	0.5188

The following stable nuclides have been checked for radioactivity as instability candidates:

no nuclide A Z N energy half-life (sec) decay mode decay energy (MeV) 228 ^134Xe 134 54 80 8.728973 > 1.830×10^30 β^−β^− 0.825 229 ^40Ca 40 20 20 8.942485 > 9.467×10^28 β^+β^+ 0.194 230 ^132Ba 132 56 76 8.741288 > 9.467×10^28 β^+β^+ 0.846 231 ^78Kr 78 36 42 9.022349 > 7.258×10^27 β^+β^+ 2.846 232 ^160Gd 160 64 96 8.496009 > 9.783×10^26 β^−β^− 1.729 233 ^184W 184 74 110 8.319737 > 9.152×10^26 α 1.656 234 ^186W 186 74 112 8.299873 > 8.521×10^26 α 1.123 235 ^183W 183 74 109 8.324699 > 4.102×10^26 α 1.680 236 ^182W 182 74 108 8.336424 > 2.619×10^26 α 1.772 237 ^114Cd 114 48 66 8.860985 > 2.020×10^26 β^−β^− 0.540 238 ^50Cr 50 24 26 9.076517 > 4.102×10^25 β^+β^+ 1.167 239 ^108Cd 108 48 60 8.897735 > 3.156×10^25 β^+β^+ 0.272 240 ^142Ce 142 58 84 8.666666 > 8.205×10^24 β^−β^−, (α) 1.417, 1.298 241 ^106Cd 106 48 58 8.893327 > 8.205×10^24 β^+β^+ 2.770 242 ^176Yb 176 70 106 8.375271 > 5.049×10^24 β^−β^−, (α) 1.083, 0.570 243 ^204Pb 204 82 122 8.194414 > 4.418×10^24 α 1.972 244 ^124Xe 124 54 70 8.778264 > 3.471×10^24 β^+β^+ 2.864 245 ^123Te 123 52 71 8.796302 > 2.903×10^24 β^+ 0.052 246 ^64Zn 64 30 34 9.102634 > 8.836×10^23 (β^+β^+) 1.096 247 ^120Te 120 52 68 8.816369 > 6.943×10^23 β^+β^+ 1.700 248 ^70Zn 70 30 40 9.065109 > 4.102×10^23 β^−β^− 0.998 249 ^46Ca 46 20 26 9.009047 > 8.836×10^22 β^−β^− 0.988 250 ^149Sm 149 62 87 8.589058 > 6.312×10^22 α 1.870 251 ^180mTa 180 73 107 8.342767 > 3.787×10^22 (β^−, K, α) 0.783, 0.929, 2.103 252 ^138Ce 138 58 80 8.705878 > 2.840×10^21 β^+β^+ 0.694 253 ^136Ce 136 58 78 8.707122 > 2.209×10^21 β^+β^+ 2.419 254 ^184Os 184 76 108 8.311850 > 1.767×10^21 α, (β^+β^+) 2.963, 1.451

Primordial radioactive nuclides

The following 34 primordial nuclides have been measured to be radioactive, or decay products were identified (Te-130, Ba-130):

no nuclide energy half-life (sec) decay mode decay energy (MeV) half-life (years) 255 ^128Te 8.743261 6.94×10^31 β^−β^− 2.530 2.2×10^24 256 ^136Xe 8.706805 7.5×10^28 β^−β^− 2.462 2.38×10^21 257 ^76Ge 9.034656 5.6423×10^28 β^−β^− 2.039 1.8×10^21 258 ^130Ba 8.742574 3.79×10^28 KK 2.620 1.2×10^21 259 ^82Se 9.017596 3.408×10^27 β^−β^− 2.995 1.1×10^20 260 ^116Cd 8.836146 9.783×10^26 β^−β^− 2.809 3.102×10^19 261 ^48Ca 8.992452 7.258×10^26 β^−β^−, β^− 4.274, 0.0058 2.301×10^19 262 ^96Zr 8.961359 6.3×10^26 β^−β^− 3.348 2.0×10^19 263 ^209Bi 8.158689 5.996×10^26 α 3.137 1.9×10^19 264 ^130Te 8.766578 2.777×10^26 β^−β^− 0.868 8.806×10^18 265 ^150Nd 8.562594 2.493×10^26 β^−β^− 3.367 7.905×10^18 266 ^100Mo 8.933167 2.461×10^26 β^−β^− 3.035 7.804×10^18 267 ^151Eu 8.565759 1.578×10^26 α 1.9644 5.004×10^18 268 ^180W 8.347127 5.680×10^25 α 2.509 1.801×10^18 269 ^50V 9.055759 4.418×10^24 β^+, β^− 2.205, 1.038 1.4×10^17 270 ^113Cd 8.859372 2.430×10^23 β^− 0.321 7.7×10^15 271 ^148Sm 8.607423 2.209×10^23 α 1.986 7.005×10^15 272 ^144Nd 8.652947 7.227×10^22 α 1.905 2.292×10^15 273 ^186Os 8.302508 6.312×10^22 α 2.823 2.002×10^15 274 ^174Hf 8.392287 6.312×10^22 α 2.497 2.002×10^15 275 ^115In 8.849910 1.392×10^22 β^− 0.499 4.4×10^14 276 ^152Gd 8.562868 3.408×10^21 α 2.203 1.1×10^14 277 ^190Pt 8.267764 2.051×10^19 α 3.252 6.5×10^11 278 ^147Sm 8.610593 3.345×10^18 α 2.310 1.061×10^11 279 ^138La 8.698320 3.219×10^18 K, β^− 1.737, 1.044 1.021×10^11 280 ^87Rb 9.043718 1.568×10^18 β^− 0.283 4.972×10^10 281 ^187Re 8.291732 1.300×10^18 β^−, α 0.0026, 1.653 4.122×10^10 282 ^176Lu 8.374665 1.187×10^18 β^− 1.193 3.764×10^10 283 ^232Th 7.918533 4.434×10^17 α, SF 4.083 1.406×10^10 284 ^238U 7.872551 1.410×10^17 α, SF 4.270 4.471×10^9 285 ^40K 8.909707 3.938×10^16 β^−, K, β^+ 1.311, 1.505, 1.505 1.25×10^9 286 ^235U 7.897198 2.222×10^16 α, SF 4.679 704×10^6 287 ^146Sm 8.626136 3.250×10^15 α 2.529 103×10^6 288 ^244Pu 7.826221 2.525×10^15 α, SF 4.666 80×10^6

Most of these isotopes have half-lives longer than the age of the universe (1.4×10¹⁰ years). The last entry, plutonium-244, has a half-life of 80 million years, or 1/57th of the age of the solar system. Some shorter-lived radionuclides (below) have been detected in uranium ore samples or in the spectra of stars (technetium, promethium, californium); these are not primordial, but are radioactive daughter products of primordial longer-lived nuclides. Others are known naturally on Earth from other spontaneous energetic production processes that have produced them since the birth of the solar system (i.e., from cosmic rays, such as carbon-14). About 50 of them have been observed to occur naturally.

Non-primordial radionuclides

These have half-lives of less than 80 million years.

no	nuclide	energy	half-life (sec)	decay mode	half-life (years or days)
289	^92Nb	9.010980	1.095×10^15	K, β^−	3.470×10^7 y
290	^236U	7.891470	7.391×10^14	α, SF	2.342×10^7 y
291	^205Pb	8.187279	5.459×10^14	β^+	1.730×10^7 y
292	^129I	8.757397	4.955×10^14	β^−	1.570×10^7 y
293	^247Cm	7.806008	4.923×10^14	α	1.560×10^7 y
294	^182Hf	8.324399	2.809×10^14	β^−	8.901×10^6 y
295	^107Pd	8.897197	2.051×10^14	β^−	6.499×10^6 y
296	^98Tc	8.953246	1.325×10^14	β^−	4.199×10^6 y
297	^53Mn	9.103175	1.180×10^14	β^+	3.739×10^6 y
298	^210mBi	8.140473	9.594×10^13	α	2.579615×10^6 y
299	^154Dy	8.528457	9.467×10^13	α	3.000×10^6 y
300	^60Fe	9.094861	8.268×10^13	β^−	2.620×10^6 y
301	^97Tc	8.970503	8.203×10^13	β^+	2.600×10^6 y
302	^135Cs	8.720082	7.258×10^13	β^−	2.300×10^6 y
303	^237Np	7.881989	6.766×10^13	α, SF	2.144×10^6 y
304	^150Gd	8.576454	5.649×10^13	α	1.790×10^6 y
305	^93Zr	9.008069	4.828×10^13	β^−	1.530×10^6 y
306	^10Be	6.810657	4.765×10^13	β^−	1.510×10^6 y
307	^26Al	8.540954	2.263×10^13	β^+	7.171×10^5 y
308	^242Pu	7.845218	1.183×10^13	α, SF	3.749×10^5 y
309	^208Bi	8.162049	1.161×10^13	β^+	3.679×10^5 y
310	^248Cm	7.799586	1.098×10^13	α, SF	3.479×10^5 y
311	^36Cl	8.891380	9.499×10^12	β^−, β^+	3.010×10^5 y
312	^79Se	9.032310	9.309×10^12	β^−	2.950×10^5 y
313	^234U	7.908308	7.747×10^12	α, SF	2.455×10^5 y
314	^126Sn	8.754026	7.258×10^12	β^−	2.230×10^5 y
315	^81Kr	9.030513	7.227×10^12	β^+	2.290×10^5 y
316	^99Tc	8.953379	6.662×10^12	β^−	2.111×10^5 y
317	^186mRe	8.295958	6.312×10^12	I	2.000×10^5 y
318	^233U	7.912873	5.024×10^12	α, SF	1.592×10^5 y
319	^236Np	7.887514	4.860×10^12	β^+, β^−, α	1.540×10^5 y
320	^41Ca	8.928347	3.219×10^12	β^+	1.020×10^5 y
321	^59Ni	9.107863	2.398×10^12	β^+	7.599×10^4 y
322	^230Th	7.937136	2.379×10^12	α, SF	7.539×10^4 y
323	^137La	8.707101	1.893×10^12	β^+	5.999×10^4 y
324	^202Pb	8.199714	1.657×10^12	β^+, α	5.251×10^4 y
325	^231Pa	7.926627	1.034×10^12	α, SF	3.277×10^4 y
326	^239Pu	7.868022	7.609×10^11	α, SF	2.411×10^4 y
327	^94Nb	8.990099	6.406×10^11	β^−	2.030×10^4 y
328	^245Cm	7.822329	2.682×10^11	α, SF	8499 y
329	^250Cm	7.779371	2.619×10^11	SF, α, β^−	8299 y
330	^243Am	7.836035	2.326×10^11	α, SF	7371 y
331	^229Th	7.942127	2.316×10^11	α	7339 y
332	^240Pu	7.862465	2.070×10^11	α, SF	6560 y
333	^14C	7.855620	1.799×10^11[2]	β^−	5701 y[2]
334	^246Cm	7.816781	1.502×10^11	α, SF	4760 y
335	^163Ho	8.478591	1.442×10^11	β^+	4570 y
336	^93Mo	9.004693	1.262×10^11	β^+	3999 y
337	^226Ra	7.966597	5.049×10^10	α	1600 y
338	^247Bk	7.806182	4.355×10^10	α	1380 y
339	^166mHo	8.451273	3.787×10^10	β^−	1200 y
340	^251Cf	7.775969	2.834×10^10	α, SF	898 y
341	^91Nb	9.023327	2.146×10^10	β^+	680 y
342	^194Hg	8.237271	1.401×10^10	β^+	444 y
343	^108mAg	8.881439	1.382×10^10	β^+, I	437.9 y
344	^241Am	7.851676	1.364×10^10	α, SF	432.2 y
345	^249Cf	7.791305	1.108×10^10	α, SF	351.1 y
346	^39Ar	8.923686	8.489×10^9	β^−	269 y
347	^192mIr	8.251875	7.605×10^9	I	241 y
348	^158Tb	8.511055	5.680×10^9	β^+, β^−	180 y
349	^242mAm	7.841913	4.450×10^9	I, α, SF	141 y
350	^32Si	8.823856	4.166×10^9	β^−	132 y
351	^209Po	8.149633	3.951×10^9	α, β^+	125.2 y[3]
352	^63Ni	9.111210	3.159×10^9	β^-	100.1 y
353	^151Sm	8.565251	2.840×10^9	β^-	90.0 y
354	^238Pu	7.877358	2.768×10^9	α, SF	87.71 y
355	^157Tb	8.522096	2.241×10^9	β^+	71.02 y
356	^148Gd	8.586706	2.237×10^9	α	70.89 y
357	^232U	7.922143	2.174×10^9	α, SF	68.89 y
358	^44Ti	8.924702	1.893×10^9	β^+	59.99 y
359	^193Pt	8.249965	1.578×10^9	β^+	50.0 y
360	^121mSn	8.808499	1.385×10^9	I, β^-	43.89 y
361	^150Eu	8.569974	1.164×10^9	β^+	36.89 y
362	^207Bi	8.168209	1.038×10^9	β^+	32.89 y
363	^42Ar	8.890923	1.038×10^9	β^-	32.89 y
364	^137Cs	8.703047	9.477×10^8	β^-	30.03 y
365	^243Cm	7.836004	9.183×10^8	α, β^+, SF	29.1 y
366	^90Sr	9.026239	9.120×10^8	β^-	28.9 y
367	^210Pb	8.141462	7.006×10^8	β^-, α	22.2 y
368	^227Ac	7.957447	6.871×10^8	β^-, α	21.77 y
369	^244Cm	7.831763	5.712×10^8	α, SF	18.1 y
370	^145Pm	8.631838	5.586×10^8	β^+, α	17.7 y
371	^241Pu	7.851590	4.510×10^8	β^-, α, SF	14.29 y
372	^152Eu	8.550897	4.262×10^8	β^+, β^-	13.51 y
373	^250Cf	7.786640	4.128×10^8	α, SF	13.08 y
374	^3H	3.087994	3.888×10^8	β^-	12.32 y
375	^85Kr	9.029919	3.384×10^8	β^-	10.72 y
376	^133Ba	8.729624	3.319×10^8	β^+	10.52 y
377	^248Bk	7.796811	> 2.840×10^8	α	9.00 y
378	^154Eu	8.537200	2.711×10^8	β^-, β^+	8.591 y
379	^194Os	8.238508	1.893×10^8	β^-	5.999 y
380	^228Ra	7.944390	1.815×10^8	β^-	5.752 y
381	^146Pm	8.615574	1.745×10^8	β^+, β^-	5.53 y
382	^60Co	9.098811	1.663×10^8	β^-	5.27 y
383	^155Eu	8.534711	1.500×10^8	β^-	4.753 y
384	^204Tl	8.190671	1.193×10^8	β^-, β^+	3.781 y
385	^174Lu	8.390726	1.045×10^8	β^+	3.312 y
386	^101Rh	8.936753	1.041×10^8	β^+	3.299 y
387	^102mRh	8.920680	9.152×10^7	β^+, I	2.9 y
388	^208Po	8.155315	9.145×10^7	α, β^+	2.898 y
389	^236Pu	7.889536	9.019×10^7	α, SF	2.858 y
390	^125Sb	8.777367	8.705×10^7	β^-	2.759 y
391	^55Fe	9.116407	8.637×10^7	β^+	2.737 y
392	^252Cf	7.769605	8.347×10^7	α, SF	2.645 y
393	^147Pm	8.609068	8.279×10^7	β^-	2.624 y
394	^22Na	8.306891	8.213×10^7	β^+	2.603 y
395	^134Cs	8.719768	6.517×10^7	β^-, β^+	2.065 y
396	^171Tm	8.417620	6.059×10^7	β^-	1.92 y
397	^228Th	7.953906	6.033×10^7	α	1.912 y
398	^172Hf	8.399252	5.901×10^7	β^+	1.87 y
399	^179Ta	8.352703	5.743×10^7	β^+	1.82 y
400	^173Lu	8.400147	4.323×10^7	β^+	1.37 y
401	^252Es	7.764621	4.075×10^7	α, β^+, β^-	1.291 y
402	^109Cd	8.883327	3.986×10^7	β^+	1.263 y
403	^235Np	7.896669	3.422×10^7	β^+, α	1.084 y
404	^106Ru	8.885686	3.228×10^7	β^-	1.023 y
405	^144Pm	8.636751	3.136×10^7	β^+	363 d
406	^145Sm	8.627590	2.938×10^7	β^+	340 d
407	^248Cf	7.800198	2.881×10^7	α, SF	333.4 d
408	^249Bk	7.790805	2.851×10^7	β^−, α, SF	330 d
409	^49V	9.050040	2.843×10^7	β^+	329.1 d
410	^54Mn	9.100131	2.697×10^7	β^+, β^−	312.2 d
411	^144Ce	8.629918	2.462×10^7	β^−	285 d
412	^254Es	7.748524	2.382×10^7	α, β^−, SF, β^+	275.7 d
413	^57Co	9.112454	2.348×10^7	β^+	271.8 d
414	^68Ge	9.056327	2.341×10^7	β^+	271 d
415	^143Pm	8.651509	2.290×10^7	β^+	265 d
416	^110mAg	8.865355	2.158×10^7	β^−, I	249.8 d
417	^65Zn	9.085352	2.105×10^7	β^+	243.6 d
418	^153Gd	8.547731	2.077×10^7	β^+	240.4 d
419	^195Au	8.238353	1.608×10^7	β^+	186.1 d
420	^194mIr	8.238025	1.477×10^7	β^−	170.9 d
421	^184mRe	8.310670	1.460×10^7	I, β^+	169 d
422	^242Cm	7.844860	1.407×10^7	α, SF	162.8 d
423	^45Ca	8.978261	1.405×10^7	β^−	162.6 d
424	^177mLu	8.361829	1.386×10^7	β^−, I	160.4 d
425	^121mTe	8.800749	1.331×10^7	I, β^+	154.1 d
426	^159Dy	8.506378	1.248×10^7	β^+	144.4 d
427	^210Po	8.147295	1.196×10^7	α	138.4 d
428	^139Ce	8.696881	1.189×10^7	β^+	137.6 d
429	^123Sn	8.785311	1.116×10^7	β^−	129.2 d
430	^170Tm	8.423096	1.111×10^7	β^−, β^+	128.6 d
431	^151Gd	8.562685	1.071×10^7	β^+, α	124 d
432	^181W	8.337924	1.047×10^7	β^+	121.2 d
433	^75Se	9.033581	1.035×10^7	β^+	119.8 d
434	^113Sn	8.853035	9.944×10^6	β^+	115.1 d
435	^182Ta	8.326456	9.887×10^6	β^−	114.4 d
436	^127mTe	8.765759	9.418×10^6	I	109 d
437	^88Y	9.029272	9.212×10^6	β^+	106.6 d
438	^257Fm	7.726619	8.683×10^6	α, SF	100.5 d
439	^185Os	8.302730	8.087×10^6	β^+	93.6 d
440	^168Tm	8.436316	8.044×10^6	β^+, β^−	93.1 d
441	^149Eu	8.584395	8.044×10^6	β^+	93.1 d
442	^35S	8.895510	7.561×10^6	β^−	87.51 d
443	^83Rb	9.024038	7.448×10^6	β^+	86.2 d
444	^46Sc	8.979091	7.239×10^6	β^−	83.78 d
445	^88Zr	9.021589	7.206×10^6	β^+	83.4 d
446	^73As	9.043341	6.938×10^6	β^+	80.3 d
447	^56Co	9.072031	6.673×10^6	β^+	77.23 d
448	^185W	8.305866	6.489×10^6	β^−	75.1 d
449	^160Tb	8.495346	6.247×10^6	β^−	72.3 d
450	^58Co	9.103153	6.122×10^6	β^+	70.86 d
451	^183Re	8.321661	6.048×10^6	β^+	70 d
452	^175Hf	8.382665	6.048×10^6	β^+	70 d
453	^188W	8.277003	6.029×10^6	β^−	69.78 d
454	^85Sr	9.025480	5.602×10^6	β^+	64.84 d
455	^95Zr	8.972989	5.532×10^6	β^−	64.03 d
456	^95mTc	8.976359	5.270×10^6	β^+, I	61 d
457	^254Cf	7.751087	5.227×10^6	SF, α	60.5 d
458	^124Sb	8.777943	5.194×10^6	β^−	60.12 d
459	^125I	8.782019	5.132×10^6	β^+	59.4 d
460	^91Y	9.020174	5.055×10^6	β^−	58.51 d
461	^148Eu	8.586882	4.709×10^6	β^+, α	54.5 d
462	^7Be	5.818470	4.598×10^6	β^+	53.22 d
463	^258Md	7.715948	4.450×10^6	α, SF	51.5 d
464	^89Sr	9.039969	4.369×10^6	β^−	50.57 d
465	^114mIn	8.846608	4.278×10^6	I, β^+	49.51 d
466	^146Gd	8.592512	4.171×10^6	β^+	48.28 d
467	^203Hg	8.195806	4.026×10^6	β^−	46.6 d
468	^237Pu	7.881060	3.905×10^6	β^+, α	45.2 d
469	^115mCd	8.835754	3.850×10^6	β^−	44.56 d
470	^59Fe	9.099516	3.844×10^6	β^−	44.49 d
471	^181Hf	8.333272	3.662×10^6	β^−	42.38 d
472	^148mPm	8.589800	3.567×10^6	β^−, I	41.28 d
473	^105Ag	8.900547	3.567×10^6	β^+	41.28 d
474	^255Es	7.741567	3.439×10^6	β^−, α, SF	39.8 d
475	^103Ru	8.918500	3.392×10^6	β^−	39.26 d
476	^127Xe	8.766768	3.145×10^6	β^+	36.4 d
477	^95Nb	8.984821	3.023×10^6	β^−	34.99 d
478	^37Ar	8.907752	3.020×10^6	β^+	34.95 d
479	^129mTe	8.744953	2.903×10^6	I, β^−	33.6 d
480	^84Rb	9.020732	2.860×10^6	β^+, β^−	33.1 d
481	^241Cm	7.848492	2.834×10^6	β^+, α	32.8 d
482	^141Ce	8.677286	2.809×10^6	β^−	32.51 d
483	^169Yb	8.428546	2.767×10^6	β^+	32.03 d
484	^260Md	7.699789	2.748×10^6	SF, α, β^+, β^−	31.81 d
485	^51Cr	9.080127	2.393×10^6	β^+	27.7 d
486	^240Cm	7.855805	2.333×10^6	α, β^+, SF	27 d
487	^233Pa	7.910426	2.331×10^6	β^−	26.98 d
488	^82Sr	8.998254	2.208×10^6	β^+	25.56 d
489	^33P	8.869434	2.189×10^6	β^−	25.34 d
490	^234Th	7.897763	2.082×10^6	β^−	24.1 d
491	^147Eu	8.598879	2.082×10^6	β^+, α	24.1 d
492	^178W	8.354563	1.866×10^6	β^+	21.6 d
493	^230U	7.933871	1.797×10^6	α, SF	20.8 d
494	^253Es	7.759019	1.769×10^6	α, SF	20.47 d
495	^227Th	7.957644	1.614×10^6	α	18.68 d
496	^86Rb	9.033502	1.611×10^6	β^−, β^+	18.65 d
497	^253Cf	7.757885	1.539×10^6	β^−, α	17.81 d
498	^74As	9.028895	1.535×10^6	β^+, β^−	17.77 d
499	^230Pa	7.931436	1.503×10^6	β^+, β^−, α	17.40 d
500	^103Pd	8.920638	1.468×10^6	β^+	16.99 d
501	^99Rh	8.935711	1.391×10^6	β^+	16.1 d
502	^48V	8.997890	1.380×10^6	β^+	15.97 d
503	^191Os	8.261870	1.331×10^6	β^−	15.41 d
504	^205Bi	8.174069	1.323×10^6	β^+	15.31 d
505	^156Eu	8.520642	1.312×10^6	β^−	15.19 d
506	^225Ra	7.973576	1.287×10^6	β^−	14.9 d
507	^32P	8.830865	1.232×10^6	β^−	14.26 d
508	^143Pr	8.652258	1.172×10^6	β^−	13.56 d
509	^189Ir	8.274783	1.140×10^6	β^+	13.19 d
510	^136Cs	8.706171	1.127×10^6	β^−	13.04 d
511	^126I	8.769026	1.117×10^6	β^+, β^−	12.93 d
512	^140Ba	8.666120	1.102×10^6	β^−	12.75 d
513	^126Sb	8.757042	1.067×10^6	β^−	12.35 d
514	^202Tl	8.199956	1.057×10^6	β^+	12.23 d
515	^190Ir	8.264755	1.018×10^6	β^+	11.78 d
516	^131Ba	8.733037	9.936×10^5	β^+	11.5 d
517	^223Ra	7.994042	9.876×10^5	α	11.43 d
518	^71Ge	9.055943	9.876×10^5	β^+	11.43 d
519	^147Nd	8.602973	9.487×10^5	β^−	10.98 d
520	^246Pu	7.805494	9.366×10^5	β^−	10.84 d
521	^188Pt	8.272514	8.813×10^5	β^+, α	10.2 d
522	^225Ac	7.975159	8.640×10^5	α	10 d
523	^131Cs	8.743541	8.371×10^5	β^+
524	^125Sn	8.758515	8.329×10^5	β^−
525	^169Er	8.431852	8.115×10^5	β^−
526	^149Gd	8.575576	8.018×10^5	β^+, α
527	^167Tm	8.445866	7.992×10^5	β^+
528	^206Po	8.159590	7.603×10^5	β^+, α
529	^72Se	9.014300	7.258×10^5	β^+
530	^106mAg	8.890639	7.154×10^5	β^+
531	^171Lu	8.409532	7.119×10^5	β^+
532	^131I	8.738842	6.930×10^5	β^−
533	^257Es	7.723468	6.653×10^5	β^−, SF
534	^111Ag	8.866111	6.437×10^5	β^−
535	^161Tb	8.490383	5.967×10^5	β^−
536	^237U	7.879800	5.832×10^5	β^−
537	^172Lu	8.401217	5.789×10^5	β^+
538	^132Cs	8.731599	5.599×10^5	β^+, β^−
539	^206Bi	8.168551	5.394×10^5	β^+
540	^196Au	8.230205	5.328×10^5	β^+, β^−
541	^56Ni	9.033899	5.249×10^5	β^+
542	^118Te	8.814726	5.184×10^5	β^+
543	^145Eu	8.609245	5.124×10^5	β^+
544	^120mSb	8.808194	4.977×10^5	β^+
545	^52Mn	9.046431	4.831×10^5	β^+
546	^156Tb	8.520667	4.622×10^5	β^+
547	^155Tb	8.531031	4.596×10^5	β^+
548	^133Xe	8.730302	4.530×10^5	β^−
549	^183Ta	8.318847	4.406×10^5	β^−
550	^245Bk	7.819020	4.268×10^5	β^+, α
551	^119mTe	8.801773	4.061×10^5	β^+, I
552	^146Eu	8.599560	3.983×10^5	β^+
553	^47Ca	8.972181	3.919×10^5	β^−
554	^234Np	7.900571	3.802×10^5	β^+
555	^96Tc	8.965255	3.698×10^5	β^+
556	^231U	7.924977	3.629×10^5	β^+, α
557	^175Yb	8.383902	3.616×10^5	β^−
558	^124I	8.775884	3.608×10^5	β^+
559	^127Sb	8.754005	3.326×10^5	β^−
560	^222Rn	7.997573	3.304×10^5	α
561	^224Ra	7.987277	3.138×10^5	α
562	^100Pd	8.923587	3.136×10^5	β^+
563	^166Dy	8.448376	2.938×10^5	β^−
564	^140Nd	8.673113	2.912×10^5	β^+
565	^47Sc	9.014564	2.894×10^5	β^−
566	^87Y	9.025565	2.873×10^5	β^+
567	^89Zr	9.024912	2.823×10^5	β^+
568	^67Ga	9.069532	2.819×10^5	β^+
569	^132Te	8.716646	2.768×10^5	β^−
570	^134Ce	8.704432	2.730×10^5	β^+
571	^199Au	8.217534	2.712×10^5	β^−
572	^201Tl	8.206561	2.625×10^5	β^+
573	^253Fm	7.757691	2.592×10^5	β^+, α
574	^191Pt	8.258228	2.473×10^5	β^+
575	^111In	8.867688	2.423×10^5	β^+
576	^97Ru	8.959080	2.411×10^5	β^+
577	^99Mo	8.939669	2.375×10^5	β^−
578	^122Sb	8.795346	2.353×10^5	β^−, β^+
579	^71As	9.027581	2.350×10^5	β^+
580	^198Au	8.220732	2.329×10^5	β^−
581	^197Hg	8.226358	2.309×10^5	β^+
582	^90Y	9.032294	2.306×10^5	β^−
583	^182Re	8.321053	2.304×10^5	β^+
584	^172Tm	8.404932	2.290×10^5	β^−
585	^67Cu	9.076086	2.226×10^5	β^−
586	^44mSc	8.924627	2.110×10^5	I, β^+
587	^128Ba	8.738523	2.100×10^5	β^+
588	^77Br	9.022431	2.053×10^5	β^+
589	^166Yb	8.442340	2.041×10^5	β^+
590	^177Ta	8.363553	2.036×10^5	β^+
591	^239Np	7.864999	2.036×10^5	β^−
592	^153Tb	8.537471	2.022×10^5	β^+
593	^66Ni	9.071423	1.966×10^5	β^−
594	^247Pu	7.791975	1.961×10^5	β^−
595	^149Pm	8.581871	1.911×10^5	β^−
596	^203Pb	8.193431	1.869×10^5	β^+
597	^238Np	7.871931	1.829×10^5	β^−
598	^240Am	7.856694	1.829×10^5	β^+, α
599	^172Er	8.399752	1.775×10^5	β^−
600	^170Lu	8.408445	1.738×10^5	β^+
601	^252Cm	7.757439	< 1.728×10^5	β^−
602	^72Zn	9.017591	1.674×10^5	β^−
603	^153Sm	8.545614	1.666×10^5	β^−
604	^202Pt	8.183209	1.584×10^5	β^−
605	^48Sc	8.998327	1.572×10^5	β^−
606	^246Bk	7.811287	1.555×10^5	β^+, α
607	^195mHg	8.229399	1.498×10^5	I, β^+
608	^188Ir	8.275200	1.494×10^5	β^+
609	^140La	8.673620	1.450×10^5	β^−
610	^69Ge	9.043800	1.406×10^5	β^+
611	^77As	9.031283	1.398×10^5	β^−
612	^119Sb	8.823235	1.375×10^5	β^+
613	^147Gd	8.584001	1.370×10^5	β^+
614	^194Au	8.237626	1.369×10^5	β^+
615	^229Pa	7.940769	1.296×10^5	β^+, α
616	^246Cf	7.810792	1.285×10^5	α, β^+, SF
617	^57Ni	9.055222	1.282×10^5	β^+
618	^105Rh	8.907956	1.273×10^5	β^−
619	^82Br	9.016407	1.270×10^5	β^−
620	^79Kr	9.013644	1.261×10^5	β^+
621	^137mCe	8.696327	1.238×10^5	I, β^+
622	^169Lu	8.414978	1.226×10^5	β^+
623	^143Ce	8.642041	1.189×10^5	β^−
624	^251Es	7.774467	1.188×10^5	β^+, α
625	^83Sr	8.996568	1.167×10^5	β^+
626	^129Cs	8.749622	1.154×10^5	β^+
627	^268Db	7.635133	1.152×10^5	SF
628	^232Pa	7.916379	1.132×10^5	β^−, β^+
629	^193Os	8.244348	1.084×10^5	β^−
630	^165Tm	8.452758	1.082×10^5	β^+
631	^131mTe	8.720392	1.080×10^5	β^−, I
632	^226Ac	7.963761	1.057×10^5	β^−, β^+, α
633	^160Er	8.484190	1.029×10^5	β^+
634	^151Pm	8.557387	1.022×10^5	β^−
635	^76As	9.022505	9.454×10^4	β^−
636	^200Tl	8.206567	9.396×10^4	β^+
637	^72As	9.018966	9.360×10^4	β^+
638	^231Th	7.924932	9.187×10^4	β^−, α
639	^252Fm	7.766498	9.140×10^4	α, SF
640	^189Re	8.272269	8.748×10^4	β^−	1.01 d

Nuclides with half-lives less than 24 hours but more than 1.0 hour

no	nuclide	energy	half-life	decay mode
641	^187W	8.284722	8.539×10^4	β^−
642	^173Hf	8.391617	8.496×10^4	β^+
643	^96Nb	8.963036	8.406×10^4	β^−
644	^154mTb	8.526912	8.172×10^4	β^+, I
645	^43K	8.922327	8.028×10^4	β^−
646	^182Os	8.316432	7.956×10^4	β^+
647	^228Pa	7.944468	7.920×10^4	β^+, α
648	^48Cr	8.963390	7.762×10^4	β^+
649	^200Pb	8.202542	7.740×10^4	β^+
650	^112Pd	8.842185	7.571×10^4	β^−
651	^28Mg	8.607706	7.529×10^4	β^−
652	^100Rh	8.927167	7.488×10^4	β^+
653	^133I	8.717094	7.488×10^4	β^−
654	^122Xe	8.770959	7.236×10^4	β^+
655	^255Fm	7.742704	7.225×10^4	α, SF
656	^181Re	8.328294	7.164×10^4	β^+
657	^197Pt	8.225756	7.161×10^4	β^−
658	^135La	8.713179	7.020×10^4	β^+
659	^142Pr	8.661417	6.883×10^4	β^−, β^+
660	^200mAu	8.202877	6.732×10^4	β^−, I
661	^159Gd	8.502576	6.652×10^4	β^−
662	^135Ce	8.698179	6.372×10^4	β^+
663	^193Au	8.244353	6.354×10^4	β^+
664	^151Tb	8.545692	6.339×10^4	β^+, α
665	^55Co	9.053647	6.311×10^4	β^+
666	^152Tb	8.536591	6.300×10^4	β^+, α
667	^188Re	8.278860	6.121×10^4	β^−
668	^125Xe	8.768864	6.084×10^4	β^+
669	^97Zr	8.926451	6.028×10^4	β^−
670	^186Ir	8.281935	5.990×10^4	β^+
671	^86Zr	8.975979	5.940×10^4	β^+
672	^76Br	8.996183	5.832×10^4	β^+
673	^170Hf	8.402210	5.764×10^4	β^+
674	^157Eu	8.513792	5.465×10^4	β^−
675	^24Na	8.422082	5.382×10^4	β^−
676	^76Kr	8.979406	5.328×10^4	β^+
677	^86Y	8.993234	5.306×10^4	β^+
678	^211Rn	8.112825	5.256×10^4	β^+, α
679	^90Nb	8.989727	5.256×10^4	β^+
680	^185Ir	8.289382	5.184×10^4	β^+
681	^240U	7.851682	5.076×10^4	β^−
682	^72Ga	9.023958	5.074×10^4	β^−
683	^69mZn	9.056536	4.954×10^4	I, β^−
684	^109Pd	8.875061	4.932×10^4	β^−
685	^123I	8.786311	4.760×10^4	β^+
686	^265Rf	7.661139	≈ 4.680×10^4	α
687	^183Os	8.309907	4.680×10^4	β^+
688	^64Cu	9.093581	4.572×10^4	β^+, β^−
689	^200Pt	8.204342	4.500×10^4	β^−
690	^130I	8.740035	4.450×10^4	β^−
691	^42K	8.905175	4.436×10^4	β^−
692	^171Hf	8.395480	4.356×10^4	β^+
693	^239Am	7.864666	4.284×10^4	β^+, α
694	^193mHg	8.231483	4.248×10^4	β^+, I
695	^203Bi	8.177436	4.234×10^4	β^+
696	^77Ge	8.996185	4.068×10^4	β^−
697	^204Bi	8.172651	4.039×10^4	β^+
698	^266Lr		3.960×10^4	SF
699	^189Pt	8.264359	3.913×10^4	β^+
700	^212Pb	8.106928	3.830×10^4	β^−
701	^175Ta	8.370813	3.780×10^4	β^+
702	^245Pu	7.813752	3.780×10^4	β^−
703	^187Ir	8.283713	3.780×10^4	β^+
704	^165Er	8.462406	3.730×10^4	β^+
705	^93Y	8.976951	3.665×10^4	β^−
706	^244Am	7.825914	3.636×10^4	β^−
707	^266Rf	7.658170	≈ 3.600×10^4	α, SF
708	^155Dy	8.517521	3.564×10^4	β^+
709	^91Sr	8.990503	3.467×10^4	β^−
710	^66Ga	9.036843	3.416×10^4	β^+
711	^156Sm	8.516007	3.384×10^4	β^−
712	^201Pb	8.196989	3.359×10^4	β^+
713	^62Zn	9.057957	3.307×10^4	β^+
714	^135Xe	8.711453	3.290×10^4	β^−
715	^128Sb	8.732343	3.244×10^4	β^−
716	^234Pu	7.898892	3.168×10^4	β^+, α
717	^184Ta	8.304154	3.132×10^4	β^−
718	^250Es	7.778407	3.096×10^4	β^+, α
719	^101Pd	8.917149	3.049×10^4	β^+
720	^52Fe	9.000789	2.979×10^4	β^+
721	^173Tm	8.396524	2.966×10^4	β^−
722	^157Dy	8.513544	2.930×10^4	β^+
723	^210At	8.128337	2.916×10^4	β^+, α
724	^176Ta	8.363202	2.912×10^4	β^+
725	^166Tm	8.444183	2.772×10^4	β^+
726	^256mEs	7.730742	2.736×10^4	β^−
727	^171Er	8.408901	2.706×10^4	β^−
728	^199Tl	8.212333	2.671×10^4	β^+
729	^211At	8.126527	2.597×10^4	β^+, α
730	^73Se	9.005821	2.574×10^4	β^+
731	^234Pa	7.898930	2.412×10^4	β^−
732	^135I	8.691994	2.365×10^4	β^−
733	^107Cd	8.884271	2.340×10^4	β^+
734	^82mRb	8.999608	2.330×10^4	β^+, I
735	^153Dy	8.523288	2.304×10^4	β^+, α
736	^127Cs	8.750383	2.250×10^4	β^+
737	^228Ac	7.944591	2.214×10^4	β^−
738	^145Pr	8.620514	2.154×10^4	β^−
739	^207Po	8.154158	2.088×10^4	β^+, α
740	^90Mo	8.962072	2.002×10^4	β^+
741	^257Md	7.725040	1.987×10^4	β^+, α, SF
742	^111mPd	8.844589	1.980×10^4	I, β^−
743	^139mNd	8.659529	1.980×10^4	β^+, I
744	^209At	8.132954	1.948×10^4	β^+, α
745	^113Ag	8.841531	1.933×10^4	β^−
746	^198Tl	8.210166	1.908×10^4	β^+
747	^251Fm	7.768590	1.908×10^4	β^+, α
748	^138Nd	8.665661	1.814×10^4	β^+
749	^160mHo	8.485877	1.807×10^4	I, β^+
750	^118mSb	8.814963	1.800×10^4	β^+
751	^243Pu	7.833648	1.784×10^4	β^−
752	^192Au	8.242036	1.778×10^4	β^+
753	^110In	8.857464	1.764×10^4	β^+
754	^133mCe	8.690771	1.764×10^4	β^+
755	^94Tc	8.966583	1.758×10^4	β^+
756	^85mY	8.986880	1.750×10^4	β^+, I
757	^73Ga	9.026112	1.750×10^4	β^−
758	^192Hg	8.238051	1.746×10^4	β^+
759	^132La	8.705721	1.728×10^4	β^+
760	^179Lu	8.345428	1.652×10^4	β^−
761	^81Rb	9.002871	1.645×10^4	β^+
762	^243Bk	7.829801	1.620×10^4	β^+, α
763	^105Ru	8.889689	1.598×10^4	β^−
764	^80mBr	9.018872	1.591×10^4	I
765	^139Pr	8.681565	1.588×10^4	β^+
766	^129Sb	8.727358	1.584×10^4	β^−
767	^244Bk	7.822491	1.566×10^4	β^+, α
768	^109In	8.864805	1.512×10^4	β^+
769	^184Hf	8.296871	1.483×10^4	β^−
770	^149Tb	8.551166	1.482×10^4	β^+, α
771	^110Sn	8.851727	1.480×10^4	β^+
772	^262Lr	7.681556	1.440×10^4	SF, β^+, α
773	^71mZn	9.017370	1.426×10^4	β^−, I
774	^141La	8.659540	1.411×10^4	β^−
775	^133La	8.714109	1.408×10^4	β^+
776	^43Sc	8.912907	1.401×10^4	β^+
777	^195mIr	8.233326	1.368×10^4	β^−, I
778	^92Y	8.993208	1.274×10^4	β^−
779	^204Po	8.161200	1.271×10^4	β^+, α
780	^132Ce	8.696131	1.264×10^4	β^+
781	^150Tb	8.545394	1.253×10^4	β^+, α
782	^117mCd	8.808840	1.210×10^4	β^−
783	^61Cu	9.087452	1.200×10^4	β^+
784	^209Pb	8.155607	1.171×10^4	β^−
785	^254Fm	7.752808	1.166×10^4	α, SF
786	^250Bk	7.779523	1.156×10^4	β^−
787	^161Er	8.476352	1.156×10^4	β^+
788	^190mRe	8.257433	1.152×10^4	β^−, I
789	^191Au	8.248343	1.145×10^4	β^+
790	^173Ta	8.374218	1.130×10^4	β^+
791	^112Ag	8.844756	1.127×10^4	β^−
792	^247Cf	7.803566	1.120×10^4	β^+, α
793	^184Ir	8.286599	1.112×10^4	β^+
794	^45Ti	8.938121	1.109×10^4	β^+
795	^167Ho	8.444304	1.081×10^4	β^−
796	^269Db	7.630064	1.080×10^4	α, SF
797	^239Cm	7.857143	1.044×10^4	β^+, α
798	^197Tl	8.215190	1.022×10^4	β^+
799	^88Kr	8.976918	1.022×10^4	β^−
800	^38S	8.778196	1.022×10^4	β^−
801	^117Sb	8.828977	1.008×10^4	β^+
802	^224Ac	7.980993	1.001×10^4	β^+, α, β^−
803	^93Tc	8.970274	9.900×10^3	β^+
804	^150Pm	8.562014	9.648×10^3	β^−
805	^92Sr	8.972067	9.576×10^3	β^−
806	^256Fm	7.737398	9.456×10^3	SF, α
807	^31Si	8.811618	9.438×10^3	β^−
808	^56Mn	9.087572	9.284×10^3	β^−
809	^65Ni	9.073267	9.062×10^3	β^−
810	^176W	8.359055	9.000×10^3	β^+
811	^116Te	8.806414	8.964×10^3	β^+
812	^141Nd	8.668476	8.964×10^3	β^+
813	^161Ho	8.488737	8.928×10^3	β^+
814	^210Rn	8.117032	8.640×10^3	α, β^+
815	^198Pb	8.202893	8.640×10^3	β^+
816	^238Cm	7.863764	8.640×10^3	β^+, α
817	^83Br	9.023243	8.640×10^3	β^−
818	^152Dy	8.532670	8.568×10^3	β^+, α
819	^178mTa	8.355075	8.496×10^3	β^+
820	^187Pt	8.267638	8.460×10^3	β^+
821	^165Dy	8.456891	8.402×10^3	β^−
822	^267Rf	7.647357	8.280×10^3	SF
823	^132I	8.720570	8.262×10^3	β^−
824	^158Er	8.484619	8.244×10^3	β^+
825	^66Ge	9.004964	8.136×10^3	β^+
826	^129Ba	8.730746	8.028×10^3	β^+
827	^177W	8.352118	7.920×10^3	β^+
828	^106mRh	8.884761	7.860×10^3	β^−
829	^138mPr	8.671088	7.632×10^3	β^+
830	^121I	8.784443	7.632×10^3	β^+
831	^127Sn	8.728800	7.560×10^3	β^−
832	^123Xe	8.764409	7.488×10^3	β^+
833	^186Pt	8.274897	7.488×10^3	β^+, α
834	^245Am	7.818674	7.380×10^3	β^−
835	^89Nb	8.977507	7.308×10^3	β^+
836	^117mIn	8.828849	6.972×10^3	β^−, I
837	^177Yb	8.359401	6.880×10^3	β^−
838	^196Tl	8.211618	6.624×10^3	β^+
839	^18F	8.022789	6.585×10^3	β^+
840	^41Ar	8.877852	6.577×10^3	β^−
841	^163Tm	8.456205	6.516×10^3	β^+
842	^239Pa	7.848148	6.480×10^3	β^−
843	^201Bi	8.177875	6.480×10^3	β^+, α
844	^207At	8.135303	6.480×10^3	β^+, α
845	^224Rn	7.971327	6.420×10^3	β^−
846	^80Sr	8.950177	6.378×10^3	β^+
847	^181Os	8.311935	6.300×10^3	β^+
848	^205Po	8.156737	6.264×10^3	β^+, α
849	^149Nd	8.570529	6.221×10^3	β^−
850	^202Bi	8.173966	6.192×10^3	β^+, α
851	^249Es	7.785464	6.132×10^3	β^+, α
852	^147Tb	8.552634	6.120×10^3	β^+
853	^87Zr	8.983373	6.048×10^3	β^+
854	^126Ba	8.727439	6.000×10^3	β^+
855	^61Co	9.102449	5.940×10^3	β^−
856	^95Ru	8.949749	5.915×10^3	β^+
857	^238Am	7.867882	5.880×10^3	β^+, α
858	^208At	8.131376	5.868×10^3	β^+, α
859	^75Br	8.993181	5.802×10^3	β^+
860	^259Md	7.709860	5.760×10^3	SF, α
861	^230Ra	7.921249	5.580×10^3	β^−
862	^142La	8.634954	5.466×10^3	β^−
863	^78As	9.004879	5.442×10^3	β^−
864	^199Pb	8.198111	5.400×10^3	β^+
865	^78Ge	8.992635	5.280×10^3	β^−
866	^255Cf	7.738739	5.100×10^3	β^−
867	^196mIr	8.219440	5.040×10^3	β^−, I
868	^139Ba	8.682217	4.984×10^3	β^−
869	^75Ge	9.029413	4.967×10^3	β^−
870	^120I	8.769577	4.896×10^3	β^+
871	^256Md	7.729062	4.620×10^3	β^+, α, SF
872	^137Pr	8.678459	4.608×10^3	β^+
873	^87Kr	8.999022	4.578×10^3	β^−
874	^164Yb	8.443419	4.548×10^3	β^+
875	^163Er	8.471168	4.500×10^3	β^+
876	^77Kr	8.982618	4.464×10^3	β^+
877	^178Yb	8.350530	4.440×10^3	β^−
878	^267Db	7.644361	4.380×10^3	SF
879	^237Am	7.874830	4.380×10^3	β^+, α
880	^142Sm	8.627616	4.349×10^3	β^+
881	^97Nb	8.953864	4.326×10^3	β^−
882	^185Pt	8.269598	4.254×10^3	β^+
883	^195Tl	8.215712	4.176×10^3	β^+
884	^104Ag	8.889702	4.152×10^3	β^+
885	^174Ta	8.368684	4.104×10^3	β^+
886	^68Ga	9.057888	4.063×10^3	β^+
887	^162mHo	8.478371	4.020×10^3	I, β^+
888	^103Ag	8.894541	3.942×10^3	β^+
889	^249Cm	7.787191	3.849×10^3	β^−
890	^183Hf	8.307885	3.841×10^3	β^−
891	^229Ac	7.937048	3.762×10^3	β^−
892	^117Te	8.798652	3.720×10^3	β^+
893	^240Np	7.853348	3.714×10^3	β^−
894	^212Bi	8.109617	3.633×10^3	β^−, α
895	^116mSb	8.816483	3.618×10^3	β^+
896	^148Tb	8.547949	3.600×10^3	β^+

Naturally occurring isotopes with half-lives below one hour

This list is incomplete; you can help by expanding it.

nuclide	half-life	decay mode
^211Pb	36.1 min	β^−
^214Pb	26.8 min	β^−
^223Fr	22 min	β^−, α
^214Bi	19.9 min	β^−, α
^206Hg	8.15 min	β^−
^215Bi	7.6 min	β^−
^221Fr	4.8 min	α
^207Tl	4.77 min	β^−
^206Tl	4.2 min	β^−
^218Po	3.10 min	α, β^−
^208Tl	3.053 min	β^−
^211Bi	2.14 min	α, β^−
^210Tl	1.3 min	β^−
^234mPa	1.17 min	β^−, I
^219At	56 s	α, β^−
^220Rn	55.6 s	α
^219Rn	3.96 s	α
^218At	1.5 s	α, β^−
^211Po	0.516 s	α
^216Po	0.145 s	α
^218Rn	35 ms	α
^215Po	1.781 ms	α
^214Po	164.3 µs	α
^215At	0.1 ms	α
^212Po	299 ns	α

See also

• Primordial nuclide
• Table of nuclides
• Isotope geochemistry
• Radionuclide
• Mononuclidic element
• Monoisotopic element
• Stable isotope
• List of elements by stability of isotopes
• List of radioactive isotopes by half-life

Sources

Almost all data are taken from reference.^[4] For more recent updates, see reference.^[5] These sources do not indicate whether certain heavy isotopes starting from Lr, Rf, Db... (etc.) were produced, observed, or only predicted from estimated data.

References

1. Table data is derived by counting members of the list; see WP:CALC. References for the list data itself are given below in this reference section
2. Other sources give the half-life of ¹⁴C as 5730 years (=1.808×10¹¹ seconds)
3. Boutin, Chad. "Polonium's Most Stable Isotope Gets Revised Half-Life Measurement". nist.gov. NIST Tech Beat. Retrieved 9 September 2014.
4. Jagdish K. Tuli, Nuclear Wallet Cards, 7th edition, April 2005, Brookhaven National Laboratory, US National Nuclear Data Center
5. Interactive Chart of Nuclides (Brookhaven National Laboratory)

External links

• Experimental atomic mass data compiled Nov. 2003
• J. Magill, G. Pfennig, J. Galy "Karlsruher Nuclide Chart", 7th edition 2006, revised printing Nov. 2007
• The LIVEChart of Nuclides – IAEA with dynamic half-life filtering
• Nice Overview picture for energy of nuclides
• National Isotope Development Center Reference information on isotopes, and coordination and management of isotope production, availability, and distribution
• Isotope Development & Production for Research and Applications (IDPRA) U.S. Department of Energy program for isotope production and production research and development