A nuclide that undergoes nuclear fission with thermal neutrons, and is generally used to refer to fertile nuclei, but the distinction between fissile materials and fissile materials is not clear in Japan's nuclear energy regulations. In addition to natural uranium 235, artificially produced plutonium 239 and uranium 233 are considered fissile nuclides in the narrow sense, but fissionable nuclides that can undergo nuclear fission with fast neutrons are also often translated as fissionable nuclides. If we broadly consider incident neutrons with energy of 20 MeV (mega electron volts) or less, this also includes uranium 238 and thorium 232. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
熱中性子で核分裂を起こす核種で,親物質核に対して使われるのが一般的だが,日本の原子力関係法規では,核分裂性物質との区分が明確ではない。天然ウラン 235のほか,人工的につくるプルトニウム 239,ウラン 233などが狭義の核分裂性核種とされるが,高速中性子で核分裂を起こしうる fissionable nuclideと呼ばれる核種も核分裂性核種と訳されることが多い。入射中性子のエネルギーが 20MeV (メガ電子ボルト) 以下と広く考えるとウラン 238,トリウム 232も含まれる。
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