柯林斯詞典fast neutron 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 (能量超過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 (能量超過1.5MeV的)高速中子 返回 fast neutron