Template:Critical mass
| 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] |
- ^ a b c d Nuclear Weapons Design & Materials, The Nuclear Threat Initiative website.[dead link][unreliable source?]
- ^ 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.
- ^ Chapter 5, Troubles tomorrow? Separated Neptunium 237 and Americium, Challenges of Fissile Material Control (1999), isis-online.org
- ^ 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.
- ^ a b Updated Critical Mass Estimates for Plutonium-238, U.S. Department of Energy: Office of Scientific & Technical Information
- ^ a b Amory B. Lovins, Nuclear weapons and power-reactor plutonium, Nature, Vol. 283, No. 5750, pp. 817–823, February 28, 1980
- ^ 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.
- ^ 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.
- ^ a b c Institut de Radioprotection et de Sûreté Nucléaire: "Evaluation of nuclear criticality safety. data and limits for actinides in transport", p. 16
- ^ Carey Sublette, Nuclear Weapons Frequently Asked Questions: Section 6.0 Nuclear Materials February 20, 1999