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Template:Critical mass

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Nuclide Half-life
(y)		 Critical mass
(kg)		 Diameter
(cm)		 Ref
uranium-233 159,200 15 11 [1]
uranium-235 703,800,000 52 17 [1]
neptunium-236 154,000 7 8.7 [2]
neptunium-237 2,144,000 60 18 [3][4]
plutonium-238 87.7 9.04–10.07 9.5–9.9 [5]
plutonium-239 24,110 10 9.9 [1][5]
plutonium-240 6561 40 15 [1]
plutonium-241 14.3 12 10.5 [6]
plutonium-242 375,000 75–100 19–21 [6]
americium-241 432.2 55–77 20–23 [7]
americium-242m 141 9–14 11–13 [7]
americium-243 7370 180–280 30–35 [7]
curium-243 29.1 7.34–10 10–11 [8]
curium-244 18.1 13.5–30 12.4–16 [8]
curium-245 8500 9.41–12.3 11–12 [8]
curium-246 4760 39–70.1 18–21 [8]
curium-247 15,600,000 6.94–7.06 9.9 [8]
berkelium-247 1380 75.7 11.8-12.2 [9]
berkelium-249 0.9 192 16.1-16.6 [9]
californium-249 351 6 9 [2]
californium-251 900 5.46 8.5 [2]
californium-252 2.6 2.73 6.9 [10]
einsteinium-254 0.755 9.89 7.1 [9]
  1. ^ a b c d Nuclear Weapons Design & Materials, The Nuclear Threat Initiative website.[dead link][unreliable source?]
  2. ^ a b c Final Report, Evaluation of nuclear criticality safety data and limits for actinides in transport, Republic of France, Institut de Radioprotection et de Sûreté Nucléaire, Département de Prévention et d'étude des Accidents.
  3. ^ Chapter 5, Troubles tomorrow? Separated Neptunium 237 and Americium, Challenges of Fissile Material Control (1999), isis-online.org
  4. ^ P. Weiss (26 October 2002). "Neptunium Nukes? Little-studied metal goes critical". Science News. 162 (17): 259. doi:10.2307/4014034. Archived from the original on 15 December 2012. Retrieved 7 November 2013.
  5. ^ a b Updated Critical Mass Estimates for Plutonium-238, U.S. Department of Energy: Office of Scientific & Technical Information
  6. ^ a b Amory B. Lovins, Nuclear weapons and power-reactor plutonium, Nature, Vol. 283, No. 5750, pp. 817–823, February 28, 1980
  7. ^ a b c Dias, Hemanth; Tancock, Nigel; Clayton, Angela (2003). "Critical Mass Calculations for 241Am, 242mAm and 243Am" (PDF). Challenges in the Pursuit of Global Nuclear Criticality Safety. Proceedings of the Seventh International Conference on Nuclear Criticality Safety. Vol. II. Tokai, Ibaraki, Japan: Japan Atomic Energy Research Institute. pp. 618–623.
  8. ^ a b c d e Okuno, Hiroshi; Kawasaki, Hiromitsu (2002). "Critical and Subcritical Mass Calculations of Curium-243 to -247 Based on JENDL-3.2 for Revision of ANSI/ANS-8.15". Journal of Nuclear Science and Technology. 39 (10): 1072–1085. doi:10.1080/18811248.2002.9715296.
  9. ^ a b c Institut de Radioprotection et de Sûreté Nucléaire: "Evaluation of nuclear criticality safety. data and limits for actinides in transport", p. 16
  10. ^ Carey Sublette, Nuclear Weapons Frequently Asked Questions: Section 6.0 Nuclear Materials February 20, 1999
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