fast neutron
柯林斯词典
1. N a neutron produced by nuclear fission that has lost little energy by collision; a neutron with a kinetic energy in excess of 0.1 MeV (能量超过0.1MeV的)快中子
2. N a neutron with a kinetic energy in excess of 1.5 MeV, the fission threshold of uranium-238 (能量超过1.5MeV的)高速中子
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