Isotopes of indium

Indium (In) consists of two primordial nuclides, with the most common (~ 95.7%) nuclide (¹¹⁵In) being measurably though weakly radioactive. Its spin-forbidden decay has a half life of 441 trillion years.

The stable isotope ¹¹³In is only 4.3% of naturally occurring indium. Among elements with a known stable isotope, only tellurium and rhenium similarly occur with a stable isotope in lower abundance than the long-lived radioactive isotope. Other than ¹¹⁵In, the longest-lived radioisotope is ¹¹¹In, with a half-life of 2.8047 days. All other radioisotopes have half-lives less than a day. This element also has 47 isomers, the longest-lived being ^114m1In, with a half-life of 49.51 days. All other meta-states have half-lives less than a day, most less than an hour, and many measured in milliseconds or less.

Indium-111 is used medically in nuclear imaging, as a radiotracer nuclide tag for gamma camera localization of protein radiopharmaceuticals, such as In-111-labeled octreotide, which binds to receptors on certain endocrine tumors (Octreoscan).^[1] Indium-111 is also used in indium white blood cell scans, which use nuclear medical techniques to search for hidden infections.

Relative atomic mass: 114.818(3).

Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life[n 1]	decay mode(s)[2][n 2]	daughter isotope(s)[n 3]	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
	excitation energy
^97In	49	48	96.94954(64)#	5# ms			9/2+#
^98In	49	49	97.94214(21)#	45(23) ms [32(+32−11) ms]	β^+	^98Cd	0+#
^98mIn	0(500)# keV			1.7(8) s [1.2(+12−4) s]
^99In	49	50	98.93422(43)#	3.1(8) s [3.0(+8-7) s]	β^+	^99Cd	9/2+#
^99mIn	400(150)# keV			1# s			1/2−#
^100In	49	51	99.93111(27)	5.9(2) s	β^+ (96.1%)	^100Cd	(6,7)+
					β^+, p (3.9%)	^99Ag
^101In	49	52	100.92634(32)#	15.1(3) s	β^+	^100Cd	9/2+#
					β^+, p	^100Ag
^101mIn	550(100)# keV			10# s			1/2−#
^102In	49	53	101.92409(12)	23.3(1) s	β^+ (99.99%)	^102Cd	(6+)
					β^+, p (.00929%)	^101Ag
^103In	49	54	102.919914(27)	60(1) s	β^+	^103Cd	9/2+#
^103mIn	631.7(1) keV			34(2) s			(1/2−)#
^104In	49	55	103.91830(9)	1.80(3) min	β^+	^104Cd	5,6(+)
^104mIn	93.48(10) keV			15.7(5) s	IT (80%)	^104In	(3+)
					β^+ (20%)	^104Cd
^105In	49	56	104.914674(19)	5.07(7) min	β^+	^105Cd	9/2+
^105mIn	674.1(3) keV			48(6) s	IT	^105In	(1/2)−
^106In	49	57	105.913465(13)	6.2(1) min	β^+	^106Cd	7+
^106mIn	28.6(3) keV			5.2(1) min	β^+	^106Cd	(3+)
^107In	49	58	106.910295(12)	32.4(3) min	β^+	^107Cd	9/2+
^107mIn	678.5(3) keV			50.4(6) s	IT	^107In	1/2−
^108In	49	59	107.909698(10)	58.0(12) min	β^+	^108Cd	7+
^108mIn	29.75(5) keV			39.6(7) min	β^+	^108Cd	2+
^109In	49	60	108.907151(6)	4.2(1) h	β^+	^109Cd	9/2+
^109m1In	650.1(3) keV			1.34(7) min	IT	^109In	1/2−
^109m2In	2101.8(2) keV			209(6) ms			(19/2+)
^110In	49	61	109.907165(13)	4.9(1) h	β^+	^110Cd	7+
^110mIn	62.1(5) keV			69.1(5) min	β^+	^110Cd	2+
^111In[n 4]	49	62	110.905103(5)	2.8047(5) d	EC	^111Cd	9/2+
^111mIn	536.95(6) keV			7.7(2) min	IT	^111In	1/2−
^112In	49	63	111.905532(6)	14.97(10) min	β^+ (56%)	^112Cd	1+
					β^− (44%)	^112Sn
^112m1In	156.59(5) keV			20.56(6) min	β^+	^112Cd	4+
^112m2In	350.76(9) keV			690(50) ns			7+
^112m3In	613.69(14) keV			2.81(3) µs			8-
^113In	49	64	112.904058(3)	Stable[n 5]			9/2+	0.0429(5)
^113mIn	391.699(3) keV			1.6579(4) h	IT	^113In	1/2−
^114In	49	65	113.904914(3)	71.9(1) s	β^+ (99.5%)	^114Cd	1+
					β^− (0.5%)	^114Sn
^114m1In	190.29(3) keV			49.51(1) d	IT (96.75%)	^114In	5+
					β^+ (3.25%)	^114Cd
^114m2In	501.94(3) keV			43.1(6) ms	IT (96.75%)	^114In	(8−)
					β^+ (3.25%)	^114Cd
^114m3In	641.72(3) keV			4.3(4) µs			(7+)
^115In[n 6][n 7]	49	66	114.903878(5)	4.41(25)×10^14 a	β^−	^115Sn	9/2+	0.9571(5)
^115mIn	336.244(17) keV			4.486(4) h	IT (95%)	^115In	1/2−
					β^− (5%)	^115Sn
^116In	49	67	115.905260(5)	14.10(3) s	β^−	^116Sn	1+
					EC	^116Cd
^116m1In	127.267(6) keV			54.29(17) min			5+
^116m2In	289.660(6) keV			2.18(4) s			8-
^117In	49	68	116.904514(6)	43.2(3) min	β^−	^117Sn	9/2+
^117mIn	315.302(12) keV			116.2(3) min	β^− (52.91%)	^117Sn	1/2−
					IT (47.09%)	^117In
^118In	49	69	117.906354(9)	5.0(5) s	β^−	^118Sn	1+
^118m1In	100(50)# keV			4.364(7) min	β^−	^118Sn	5+
^118m2In	240(50)# keV			8.5(3) s			8-
^119In	49	70	118.905845(8)	2.4(1) min	β^−	^119Sn	9/2+
^119m1In	311.37(3) keV			18.0(3) min	β^− (94.4%)	^119Sn	1/2−
					IT (5.6%)	^119In
^119m2In	654.27(7) keV			130(15) ns			1/2+,3/2+
^120In	49	71	119.90796(4)	3.08(8) s	β^−	^120Sn	1+
^120m1In	50(60)# keV			46.2(8) s			5+
^120m2In	300(200)# keV			47.3(5) s	β^−	^120Sn	8(−)
^121In	49	72	120.907846(29)	23.1(6) s	β^−	^121Sn	9/2+
^121mIn	312.98(8) keV			3.88(10) min	β^− (98.8%)	^121Sn	1/2−
					IT (1.2%)	^121In
^122In	49	73	121.91028(5)	1.5(3) s	β^−	^122Sn	1+
^122m1In	40(60)# keV			10.3(6) s			5+
^122m2In	290(140) keV			10.8(4) s	β^−	^122Sn	8-
^123In	49	74	122.910438(26)	6.17(5) s	β^−	^123mSn	(9/2)+
^123mIn	327.21(4) keV			47.4(4) s	β^−	^123mSn	(1/2)−
^124In	49	75	123.91318(5)	3.11(10) s	β^−	^124Sn	3+
^124mIn	-20(70) keV			3.7(2) s	β^−	^124Sn	(8)(−#)
					IT	^124In
^125In	49	76	124.91360(3)	2.36(4) s	β^−	^125mSn	9/2+
^125mIn	360.12(9) keV			12.2(2) s	β^−	^125Sn	1/2(−)
^126In	49	77	125.91646(4)	1.53(1) s	β^−	^126Sn	3(+#)
^126mIn	100(60) keV			1.64(5) s	β^−	^126Sn	8(−#)
^127In	49	78	126.91735(4)	1.09(1) s	β^− (99.97%)	^127mSn	9/2(+)
					β^−, n (.03%)	^126Sn
^127mIn	460(70) keV			3.67(4) s	β^− (99.31%)	^127mSn	(1/2−)
					β^−, n (.69%)	^126Sn
^128In	49	79	127.92017(5)	0.84(6) s	β^− (99.96%)	^128Sn	(3)+
					β^−, n (.038%)	^127Sn
^128m1In	247.87(10) keV			10(7) ms			(1)−
^128m2In	320(60) keV			720(100) ms	β^−	^128Sn	(8−)
^129In	49	80	128.92170(5)	611(4) ms	β^− (99.75%)	^129Sn	9/2+#
					β^−, n (.25%)	^128Sn
^129m1In	380(70) keV			1.23(3) s	β^− (97.2%)	^129Sn	(1/2−)#
					β^−, n (2.5%)	^128Sn
					IT (.3%)	^129In
^129m2In	1688.0(5) keV			8.5(5) µs			17/2−
^130In	49	81	129.92497(4)	0.29(2) s	β^− (98.35%)	^130Sn	1(−)
					β^−, n (1.65%)	^129Sn
^130m1In	50(50) keV			538(5) ms			10-#
^130m2In	400(60) keV			0.54(1) s			(5+)
^131In	49	82	130.92685(3)	0.28(3) s	β^− (97.8%)	^131Sn	(9/2+)
					β^−, n (2.19%)	^130Sn
^131m1In	363(37) keV			0.35(5) s			(1/2−)
^131m2In	4.10(7) MeV			320(60) ms			(19/2+ to 23/2+)
^132In	49	83	131.93299(7)	206(4) ms	β^− (94.8%)	^132Sn	(7−)
					β^−, n (5.2%)	^131Sn
^133In	49	84	132.93781(32)#	165(3) ms	β^−, n (85%)	^132Sn	(9/2+)
					β^− (15%)	^133Sn
^133mIn	330(40)# keV			180# ms	IT	^133In	(1/2−)
^134In	49	85	133.94415(43)#	140(4) ms	β^− (79%)	^134Sn
					β^−, n (17%)	^133Sn
					β^−, 2n (4%)	^132Sn
^135In	49	86	134.94933(54)#	92(10) ms			9/2+#

1. Bold for isotopes with half-lives longer than the age of the universe (nearly stable)
2. Abbreviations:
   EC: Electron capture
   IT: Isomeric transition
3. Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
4. Used in medical applications
5. Theoretically capable of spontaneous fission
6. Fission product
7. Primordial radionuclide

Notes

• Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
• Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
• Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.

References

1. "Octreoscan review". Medscape. (registration required (help)).
2. "Universal Nuclide Chart". nucleonica. (registration required (help)).

• Isotope masses from:
  • G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.
• Isotopic compositions and standard atomic masses from:
  • J. R. de Laeter; J. K. Böhlke; P. De Bièvre; H. Hidaka; H. S. Peiser; K. J. R. Rosman; P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683.
  • M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051. Lay summary.
• Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
  • G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.
  • National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005.
  • N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0-8493-0485-9.