List of nuclear weapons tests

Nuclear weapons testing according to the standard definition used in treaty language for the space/time requirement is:

In conformity with treaties between the United States and the Soviet Union, a salvo is defined, for multiple explosions for peaceful purposes, as two or more separate explosions where a period of time between successive individual explosions does not exceed 5 seconds and where the burial points of all explosive devices can be connected by segments of straight lines, each of them connecting two burial points, and the total length does not exceed 40 kilometers. For nuclear weapon tests, a salvo is defined as two or more underground nuclear explosions conducted at a test site within an area delineated by a circle having a diameter of two kilometers and conducted within a total period of time of 0.1 second.[1]

This definition is inclusive of "zero yield" safety tests of warheads, whether the test is successful (there is no nuclear yield) or the test is unsuccessful (there is a nuclear yield). It does not include hydronuclear, cold or subcritical tests because no nuclear explosions are possible, even in failure. In these sorts of tests there may be small amounts of chain reaction occurring, but they stop before materially adding to the chemical explosion that causes them. The line here is finely drawn, but, among other things, subcritical testing is not prohibited by the Comprehensive Nuclear Test Ban Treaty, while safety tests are.[2][3]

Totals by country

The table in this section summarizes all worldwide nuclear testing (including the two bombs dropped in combat which were not tests). The country names are links to summary articles for each country, which may in turn be used to drill down to test series articles which contain details on every known nuclear explosion and test. The notes attached to various table cells detail how the numbers therein are arrived at. As of 1993, worldwide, 520 atmospheric nuclear explosions (including 8 underwater) have been conducted with a total yield of 545 Megaton (Mt): 217 Mt from fission and 328 Mt from fusion, while the estimated number of underground nuclear tests conducted in the period from 1957 to 1992 is 1,352 explosions with a total yield of 90 Mt.[4]

Worldwide nuclear testing totals by country
Country Tests [Notes 1] Devices fired [Notes 2] Devices w/ unknown yields [Notes 3] Peaceful use tests [Notes 4] Non-PTBT tests [Notes 5] Yield range (kilotons) Total yield (kilotons) Percentage by tests Percentage by yield
USA [1][5] 1032 [Notes 6] 1132 12 27 [Notes 7]
(Operation Plowshare)		 231 0 to 15,000 196,514 [Notes 8] 48.7% 36.3%
USSR [1][6] 727 [Notes 9][7] 981 248 156 [Notes 10]
(Nuclear Explosions for the National Economy)		 229 0 to 50,000 296,837 34.4% 54.9%
UK [1] 88 [Notes 11] 88 31 0 64 0 to 3,000 9,282 4.15% 1.72%
France [1] 217 [Notes 12][8] 217 0 4 [Notes 13] 57 0 to 2,600 13,567 10.2% 2.51%
China [1] 47 [Notes 14][6] 48 7 0 23 0 to 4,000 24,409 2.22% 4.51%
India [1] 3 6 0 1 [Notes 15] 0 0 to 43 68 0.141% 0.0126%
Pakistan [1] 2 6 [Notes 16] 0 0 0 1 to 32 51 0.107% 0.0094%
North Korea [1] 4 4 0 0 0 1 to 7 22 0.189% 0.0041%
Totals 2120 2475 294 188 604 0 to 50,000 540,749
  1. ↑ Including salvo tests counted as a single test.
  2. ↑ Detonations include zero-yield detonations in safety tests and failed full yield tests, but not those in the accident category listed above.
  3. ↑ The number of detonations for which the yield is unknown.
  4. ↑ As declared so by the nation testing; some may have been dual use.
  5. ↑ Tests which violate the PTBT - atmospheric, surface, barge, space, and underwater tests.
  6. ↑ Including five tests in which the devices were destroyed before detonation by rocket failures, and the combat bombs dropped on Japan in World War II
  7. ↑ Includes both application tests and research tests at NTS.
  8. ↑ When a test yield reads "< number kt" (like "< 20 kt") this total scores the yield as half the stated maximum, i.e., 10 kt in this example.
  9. ↑ Includes the test device left behind in Semipalatinsk and 11 apparent failures not in the official list, but included in list in reference following:
  10. ↑ 124 applications tests and 32 research tests which helped design better PNE charges.
  11. ↑ Includes the 43 Vixen tests, which were safety tests.
  12. ↑ Including 5 Pollen plutonium dispersal tests near at Adrar Tikertine near In Ekker, and two possible safety tests in 1978, listed in reference following:
  13. ↑ Four of the tests at In Ekker were the focus of attention at APEX (Application pacifique des expérimentations nucléaires). They gave the tests different names, causing some confusion.
  14. ↑ Includes one test destroyed before detonation by a failed parachute, and two which are unlisted in most sources, but are listed in the reference following:
  15. ↑ Indira Gandhi, in her capacity as India's Minister of Atomic Energy at the time, declared the Smiling Buddha test to have been a test for the peaceful uses of atomic power.
  16. ↑ There is some uncertainty as to exactly how many bombs were exploded in each of Pakistan's tests. It could be as low as three altogether or as high as six.

Known tests

In the following subsections, a selection of significant tests (by no means exhaustive) are listed, representative of the testing effort in each nuclear country.

United States of America

The standard "official" list of tests for American devices is arguably the United States Department of Energy DoE-209 document.[5] The United States conducted around 1,054 nuclear tests (by official count) between 1945 and 1992, including 216 atmospheric, underwater, and space tests.[9] Some significant tests conducted by the United States include:[10]

Shot "Baker" of Operation Crossroads (1946) was the first underwater nuclear explosion.

Soviet Union

The 18,000 km2 expanse of the Semipalatinsk Test Site (indicated in red), attached to Kurchatov (along the Irtysh river), and near Semey, as well as Karagandy, and Astana. The site comprised an area the size of Wales.[12]

After the fall of the USSR, the American government (as a member of the International Consortium "International Science and Technology Center", http://www.istc.ru) hired a number of top scientists in Sarov (aka Arzamas-16, the Soviet equivalent of Los Alamos and thus sometimes called "Los Arzamas") to draft a number of documents about the history of the Soviet atomic program.[13] One of the documents was the definitive list of Soviet nuclear tests.[6] Most of the tests have no code names, unlike the American tests, so they are known by their test numbers from this document. Some list compilers have detected discrepancies in that list; one device was abandoned in its cove in a tunnel in Semipalatinsk when the Soviets abandoned Kazakhstan,[14] and one list[15] lists 13 other tests which apparently failed to provide any yield. The source for that was the well respected Russian Strategic Nuclear Forces[16] which confirms 11 of the 13; those 11 are in the Wikipedia lists.

The Soviet Union conducted 715 nuclear tests (by the official count)[17] between 1949 and 1990, including 219 atmospheric, underwater, and space tests. Most of them took place at the Semipalatinsk Test Site in Kazakhstan and the Northern Test Site at Novaya Zemlya. Additional industrial tests were conducted at various locations in Russia and Kazakhstan, while a small number of tests were conducted in Ukraine, Uzbekistan, and Turkmenistan.

In addition, the large-scale military exercise was conducted by Soviet army to explore the possibility of defensive and offensive warfare operations on the nuclear battlefield. The exercise, under code name of "Snezhok" (Snowball), involved detonation of a nuclear bomb twice as powerful as the one used in Nagasaki and approximately 45,000 soldiers coming through the epicenter immediately after the blast[18] The exercise was conducted on September 14, 1954, under command of Marshal Georgy Zhukov to the north of Totskoye village in Orenburg Oblast, Russia.

Some significant Soviet tests include:

The last Soviet test took place on October 24, 1990. After the dissolution of the USSR in 1992, Russia inherited the USSR's nuclear stockpile, while Kazakhstan inherited the Semipalatinsk nuclear test area, as well as the Baikonur Cosmodrome, the Sary Shagan missile/radar test area and three ballistic missile fields. Semipalatinsk included at least the one unexploded device, later blown up with conventional explosives by a combined USA/Kazakh team. No testing has occurred in the former territory of the USSR since its dissolution.

United Kingdom

The United Kingdom has conducted 45 tests (21 in Australian territory, including 9 in mainland South Australia at Maralinga and Emu Field, 3 at Malden Island and 6 at Kiritibati (Christmas Island) in the Line Islands of the central Pacific, and 24 in the U.S. as part of joint test series). Often excluded from British totals are the 31 safety tests of Operation Vixen in Maralinga. British test series include:

Last test: Julin Bristol, November 26, 1991, vertical shaft.

Atmospheric tests involving nuclear material but conventional explosions:[19]

France

France conducted 210 nuclear tests between February 13, 1960 and January 27, 1996.[20] Four were tested at Reggane, Algeria, 13 at In Ekker, Algeria and the rest at Moruroa and Fangataufa Atolls in French Polynesia. Often skipped in lists are the 5 safety tests at Adrar Tikertine in Algeria.[21]

China

The foremost list of Chinese tests compiled by the Federation of American Scientists[23] skips over two Chinese tests listed by others. The People's Republic of China conducted 45 tests (23 atmospheric and 22 underground, all conducted at Lop Nur Nuclear Weapons Test Base, in Malan, Xinjiang)

India

India announced it had conducted a test of a single device in 1974 near Pakistan's eastern border under the codename Operation Smiling Buddha. After 24 years, India publicly announced five further nuclear tests on May 11 and May 13, 1998. The official number of Indian nuclear tests is six, conducted under two different code-names and at different times.

Pakistan

Pakistan conducted 6 official tests, under 2 different code names, in the final week of May 1998. From 1983 to 1994, around 24 nuclear cold tests were carried out by Pakistan; these remained unannounced and classified until 2000. In May 1998, Pakistan responded publicly by testing 6 nuclear devices.[28]

North Korea

On October 9, 2006, North Korea announced they had conducted a nuclear test in North Hamgyong Province on the northeast coast at 10:36 AM (11:30 AEST). There was a 3.58 magnitude earthquake reported in South Korea. There was a 4.2 magnitude tremor detected 240 miles north of P'yongyang. The low estimates on the yield of the test—potentially less than a kiloton in strength—have led to speculation as to whether it was a fizzle (unsuccessful test), or not a genuine nuclear test at all.

On May 25, 2009, North Korea announced having conducted a second nuclear test. A tremor, with magnitude reports ranging from 4.7 to 5.3, was detected at Mantapsan, 233 miles northeast of P'yongyang and within a few kilometers of the 2006 test location. While estimates as to yield are still uncertain, with reports ranging from 3 to 20 kilotons, the stronger tremor indicates a significantly larger yield than the 2006 test.

On 12 February 2013, North Korean state media announced it had conducted an underground nuclear test, its third in seven years. A tremor that exhibited a nuclear bomb signature with an initial magnitude 4.9 (later revised to 5.1) was detected by both Comprehensive Nuclear-Test-Ban Treaty Organization Preparatory Commission (CTBTO)[33] and the United States Geological Survey (USGS).[34] The tremor occurred at 11:57 local time (02:57 UTC) and the USGS said the hypocenter of the event was only one kilometer deep. South Korea's defense ministry said the event reading indicated a blast of six to seven kilotons.[35][36][37][38] However, there are some experts who estimate the yield to be up to 15 kt, since the test site's geology is not well understood.[39] In comparison, the atomic (fission) bombs dropped by the Enola Gay on Hiroshima (Little Boy, a "gun-type" atomic bomb) and on Nagasaki by Bockscar (Fat Man, an "implosion-type" atomic bomb) had blast yields of the equivalents of 13 and 21 kilotons of TNT, respectively.

On January 5, 2015, North Korean TV news anchors announced that they had successfully tested a "miniaturized atomic bomb", about 5 miles from the Punggye-ri nuclear site where a test was conducted in 2013.

On January 6, 2016, North Korea announced that it conducted a successful test of a hydrogen bomb. The seismic event, at a magnitude of 5.1, occurred 19 kilometers (12 miles) east-northeast of Sungjibaegam.[40]

Alleged tests

There have been a number of significant alleged/disputed/unacknowledged accounts of countries testing nuclear explosives. Their status is either not certain or entirely disputed by most mainstream experts.

Israel / South Africa

Main article: Vela Incident

The Vela Incident was an unidentified double flash of light detected by a partly functional, decommissioned American Vela Satellite on September 22, 1979 in the Indian Ocean (near the Prince Edward Islands off Antarctica), other sensors which could have recorded proof of a nuclear test were not functioning on this satellite. It is possible that this was produced by a nuclear device. If this flash detection was actually a nuclear test, a popular theory favored in the diary of then sitting American President Jimmy Carter, is that it resulted from a covert joint South African and Israeli nuclear test of an advanced highly miniaturized Israeli artillery shell sized device which was unintentionally detectable by satellite optical sensor due to a break in the cloud cover of a typhoon.[41]

Pakistan

Because Pakistan's nuclear programme was conducted under extreme secrecy, it raised concerns in the Soviet Union and India, who suspected that since the 1974 test it was inevitable that Pakistan would further develop its programme. The pro-Soviet newspaper, The Patriot, reported that "Pakistan has exploded a nuclear device in the range of 20 to 50 kilotons" in 1983.[42] But it was widely dismissed by Western diplomats as it was pointed out that The Patriot had previously engaged in spreading disinformation on several occasions. In 1983, India and the Soviet Union both investigated secret tests but, due to lack of any scientific data, these statements were widely dismissed.[43]

In their book, The Nuclear Express, authors Thomas Reed and Danny Stillman also allege that the People's Republic of China allowed Pakistan to detonate a nuclear weapon at its Lop Nur test site in 1990, eight years before Pakistan held its first official weapons test.[44]

However, senior scientist Dr. Abdul Qadeer Khan strongly rejected the claim in May 1998.[45] According to Khan, due to its sensitivity, no country allows another country to use their test site to explode the devices.[45] Such an agreement only existed between the United States and the United Kingdom since the 1958 US–UK Mutual Defense Agreement which among other things allows Britain access to the American Nevada National Security Site for testing.[46] Dr. Samar Mubarakmand, another senior scientist, also confirmed Dr. Khan's statement and acknowledged that cold tests were carried out, under codename Kirana-I, in a test site which was built by the Corps of Engineers under the guidance of the PAEC.[47]

North Korea

Main article: Ryanggang explosion

On September 9, 2004, it was reported by South Korean media that there had been a large explosion at the Chinese/North Korean border. This explosion left a crater visible by satellite and precipitated a large (2 mile diameter) mushroom cloud. The United States and South Korea quickly downplayed this, explaining it away as a forest fire that had nothing to do with the DPRK's nuclear weapons program.

Germany

Hitlers Bombe, a book published in German by the historian Rainer Karlsch in 2005, has alleged that there is evidence that Nazi Germany performed some sort of test of a "nuclear device" (a hybrid fusion device unlike any modern nuclear weapons) in March 1945, though the evidence for this has not yet been confirmed, and has been doubted by many historians.

Tests of live warheads on rockets

The Frigate Bird explosion seen through the periscope of USS Carbonero (SS-337).

Missiles and nuclear warheads have usually been tested separately, because testing them together is considered highly dangerous; they are certainly the most extreme type of live fire exercise. The only US live test of an operational missile was the following:

Other live tests with the nuclear explosive delivered by rocket by the USA include:

The Soviet Union tested nuclear explosives on rockets as part of their development of a localised anti-ballistic missile system in the 1960s. Some of the Soviet nuclear tests with warheads delivered by rocket include:

The People's Republic of China conducted CHIC-4 with a Dongfeng-2 rocket launch in October 27, 1966. The warhead exploded with a yield of 12 kt.

Most powerful tests

The following list contains all known nuclear tests conducted with a yield of 10 Mt TNT equivalent and more.

Worldwide nuclear test with a yield of 10 Mt TNT equivalent and more
Date (GMT) Yield (megatons) Deployment Country Test Site Name or Number
October 30, 1961 50 parachute air drop Soviet Union Novaya Zemlya Tsar Bomba, Test #130
December 24, 1962 24.2 air drop Soviet Union Novaya Zemlya Test #219
August 5, 1962 21.1 air drop Soviet Union Novaya Zemlya Test #147
September 27, 1962 20.0 air drop Soviet Union Novaya Zemlya Test #174
September 25, 1962 19.1 air drop Soviet Union Novaya Zemlya Test #173
February 28, 1954 15 ground USA Bikini Atoll Castle Bravo
May 4, 1954 13.5 barge USA Bikini Atoll Castle Yankee
October 23, 1961 12.5 air drop Soviet Union Novaya Zemlya Test #123
March 26, 1954 11.0 barge USA Bikini Atoll Castle Romeo
October 31, 1952 10.4 ground USA Eniwetok Ivy Mike
August 25, 1962 10.0 air drop Soviet Union Novaya Zemlya Test #158
September 19, 1962 10.0 air drop Soviet Union Novaya Zemlya Test #168

See also

References

  1. 1 2 3 4 5 6 7 8 9 Yang, Xiaoping; North, Robert; Romney, Carl; Richards, Paul G. (August 2000), Worldwide Nuclear Explosions (PDF), retrieved 2013-12-31
  2. ↑ Martin Kalinowski. "SubCritical Tests". Retrieved 2014-01-01.
  3. ↑ Jeffrey Lewis. "Subcritical Experiments". Retrieved 2014-01-01.
  4. ↑ Atmospheric Nuclear Tests NATO ASI Series Volume 35, 1998, pp 219-260 Radiological Consequences of Nuclear Testing for the Population of the Former USSR (Input Information, Models, Dose, and Risk Estimates)O. A. Pavlovski
  5. 1 2 "United States Nuclear Tests: July 1945 through September 1992 (Revision 15)" (PDF). Department of Energy, Nevada Operations Office. December 2000. Retrieved 2013-10-26. Generally regarded as the "official" list of American tests.
  6. 1 2 3 Andryushin, L. A.; Voloshin, N. P.; Ilkaev, R. I.; Matushchenko, A. M.; Ryabev, L. D.; Strukov, V. G.; Chernyshev, A. K.; Yudin, Yu. A. (1999). "Catalog of Worldwide Nuclear Testing". Sarov, Russia: RFNC-VNIIEF. Retrieved 2013-12-18.
  7. ↑ Podvig, Pavel, ed. (2001), Russian Strategic Nuclear Forces, Cambridge, MA: MIT Press, retrieved 2014-01-09
  8. ↑ "Le CEP in Polynesie Francaise - Archives sur le Centre d'Experimentation du Pacifique a Muroroa, Hao et Fangataufa: Chronologie des essais nucléaires en Polynésie Française effectués de 1966 à 1996". Retrieved 2014-01-24.
  9. ↑ "Chronological Listing of Above Ground Nuclear Detonations". Wm. Robert Johnston. Retrieved 2001-02-06.
  10. ↑ "Nuclear weapons and the United States - Wikipedia, the free encyclopedia". En.wikipedia.org. Retrieved 2012-08-17.
  11. ↑ MacKenzie, Donald A. (1993). Inventing Accuracy: A Historical Sociology of Nuclear Missile Guidance. Cambridge, Massachusetts: MIT Press. pp. 343–344. ISBN 978-0-262-63147-1.
  12. ↑ Togzhan Kassenova (28 September 2009). "The lasting toll of Semipalatinsk's nuclear testing". Bulletin of the Atomic Scientists.
  13. ↑ Yury A Yudin, Project Manager. "Manuscript on the History of the Soviet Nuclear Weapons and Nuclear Infrastructure" (PDF). Retrieved 2014-01-01.
  14. ↑ Ellen Barry. "Old Soviet Nuclear Site in Asia Has Unlikely Sentinel: The U.S.".
  15. ↑ Wm Robert Johnston, PhD. "Johnston Archive of Nuclear Weapons". Retrieved 2013-12-31.
  16. ↑ Podvig, Pavel, ed. (2001), Russian Strategic Nuclear Forces, Cambridge, MA: MIT Press, retrieved 2014-01-09
  17. ↑ "Soviet Nuclear Test Summary". Nuclearweaponarchive.org. Retrieved 2010-09-04.
  18. ↑ Viktor Suvorov, Shadow of Victory (Тень победы), Donetsk, 2003, ISBN 966-696-022-2, pages 353-375.
  19. ↑ "Australian participants in British nuclear tests in Australia — Vol 1: Dosimetry" (PDF). Australian Department of Veteran's Affairs. Retrieved 2007-12-24.
  20. ↑ "Listing des essais nucléaires français". Capcomespace.net. Retrieved 2010-09-04.
  21. ↑ "Le CEP in Polynesie Francaise - Archives sur le Centre d'Experimentation du Pacifique a Muroroa, Hao et Fangataufa: Chronologie des essais nucléaires en Polynésie Française effectués de 1966 à 1996". Retrieved 2014-01-24.
  22. ↑ Essais nucléaires : Gerboise verte, la bombe et le scoop qui font plouf... (actualisé), Jean-Dominique Merchet, Libération
  23. ↑ "Chinese Nuclear tests". Retrieved 2013-12-31.
  24. ↑ "China's Nuclear Tests". Nuclearthreatinitiative.org. Retrieved 2010-09-04.
  25. ↑ China's Nuclear program in the 1980s nti.org
  26. ↑ "Chinese Nuclear Tests Allegedly Cause 750,000 Deaths" Epoch Times. March 30, 2009.
  27. ↑ "India's Nuclear Weapons Program - Smiling Buddha: 1974". Nuclear Weapon Archive.
  28. 1 2 Chidanand Rajghatta, TNN, Sep 21, 2009, 12.00am IST (2009-09-21). "AQ Khan nails Pakistan's nuke lies - Pakistan - World - The Times of India". The Times of India. Retrieved 2010-09-04.
  29. ↑ Azam, Rai Muhammad Saleh Azam (June 2000). "Where Mountains Move: The Story of Chagai, §Kirana Hills, Sarghodha Air Force Base: Kirana-I: The Cold tests.". Rai Muhammad Saleh Azam. Article published in the Nation, Defence Journal. Retrieved 2011.
  30. 1 2 When Mountains Move: The Story of Chagai Rai Muhammad Saleh Azam, defencejournal.com
  31. 1 2 "Pakistan's Nuclear Weapons Program - 1998: The Year of Testing". Nuclearweaponarchive.org. Retrieved 2012-08-17.
  32. 1 2 Bulletin of the Atomic Scientists - Google Books. Books.google.co.in. Retrieved 2012-08-17.
  33. ↑ "Press Release: On the CTBTO's detection in North Korea". CTBTO. Retrieved 12 February 2013.
  34. ↑ "M5.1 Nuclear Explosion - 24km ENE of Sungjibaegam, North Korea". Earthquake Hazards Program. United States Geological Survey. 12 February 2013. Retrieved 12 February 2013.
  35. ↑ Riviera, Gloria; Akiko, Fujita (12 February 2013). "North Korea Tremor Arouses Suspicion of Nuclear Test". ABC News. Retrieved 12 February 2013.
  36. ↑ "M5.1 – 24km ENE of Sungjibaegam, North Korea". USGS. 12 February 2013. Retrieved 12 February 2013.
  37. ↑ Chance, David; Kim, Jack (12 February 2013). "China joins U.S., Japan in condemning North Korea nuclear test". Reuters. Retrieved 12 February 2013.
  38. ↑ MacLeod, Calum (12 February 2013). "Obama calls North Korea nuclear test a threat to U.S.". USA Today. Retrieved 12 February 2013.
  39. ↑ "North Korea nuclear test raises uranium concerns". 12 February 2013. Retrieved 12 February 2013.
  40. ↑ "North Korea nuclear: State claims first hydrogen bomb test". 7 January 2016. Retrieved 7 January 2016.
  41. ↑
    • Hersh, Seymour (1991). The Samson option: Israel's Nuclear Arsenal and American Foreign Policy. Random House. ISBN 0-394-57006-5., page 271
  42. ↑ NTI: 1983 in Pakistan
  43. ↑ —S.G. Roy, "India Investigates Reported Nuclear Test," United Press International, 25 June 1983, International; in Lexis-Nexis Academic Universe, 25 June 1983, http://web.lexis-nexis.com; "Pakistan Adamantly Rejects Accusation it Tested Bomb," Washington Post, 26 June 1983, First Section, World News, A24; in Lexis-Nexis Academic Universe, 25 June 1983, http://web.lexis-nexis.com.
  44. ↑ William Broad, "Hidden Travels of the Atomic Bomb", New York Times (8 December 2008).
  45. 1 2 Khan, Kamran (May 30, 1998). "Interview with Abdul Qadeer Khan". Kamran Khan, director of the News Intelligence Unit of "The News International". Jang Media Group, Co. Retrieved May 30, 2011.
  46. ↑ http://www.ford.utexas.edu/library/document/nsdmnssm/nsdm276a.htm
  47. ↑ Mir, Hamid (May 3, 2004). "Interview of Dr. Samar Mubarak — Head of Pakistan Missile Program". Hamid Mir, director of the Political Intelligence Directorate of "The News International". Geo Television Network. Retrieved May 13, 2011.

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