radioactive decay series

A proof of the secular equilibrium formula in radioactive cascade decay series

放射性递次衰变系列中长期平衡公式的证明

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。

Radioactive series: Any of four sets of unstable heavy atomic nuclei that undergo a series of alpha decay and Beta decay until a stable nucleus is achieved.

放射性系：四组不稳定的重原子核，通过一系列α衰变和β衰变直至达到稳定的核为止。

The E-factor method for solving the equations of succesive decay in a radioactive series

放射性递次衰变方程的E因子解法

The numerical methods used in analysing the experimental decay data of synthesizing a new heavy neutron rich isotope 239 Pa are studied, and its half life is obtained by analysing the decays of a radioactive series for the first time.

根据合成239Pa实验的特定条件，利用递次衰变关系首次确定了丰中子新核素239Pa的半衰期。