Heavy-ion 14~ C can not only be directly emitted by three radioactive series ( 238~ U, 235~ U and 232~ Th), but can also be produced by neutrons of the spontaneous fission and α-decay interacting with matter.
由于铀,钍、锕三系能直接发射微量重离子~(14)C,以及自发裂变中子和α-衰变与物质发生核相互作用,也可产生~(14)C。
The absolute determination of cumulative yield of several nuclides from induced fission of~ ( 235) u by neutrons of spontaneous fission of~ ( 252) cf
~(252)Cf自发裂变中子诱发~(235)U裂变时几个核素裂变产额的绝对测定
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