它产生于铀衰变链中的镭，而铀是所有岩石和土壤中都能找到的一种元素，含量各不相同。
It is produced from radium in the decay chain of uranium, an element found in varying amounts in all rocks and soil.
用二进制数对递次衰变链的衰变路径进行编码。
The decay pathways in successive decay chain were coded with binary digits.
氡是天然放射性惰性气体，是铀系衰变链中的一个衰变产物。
As a product from the uranium disintegration, radon is a natural radioactive idle gas.
研制了聚变一裂变混合堆放射性计算程序fdkr和配套的衰变链数据库af—DCDL—IB。
A computer code FDKR and its associated data library AF-DCDLIB have been developed for fusion-fission hybrid reactor radioactivity calculations.
研制了聚变一裂变混合堆放射性计算程序fdkr和配套的衰变链数据库af—DCDL—IB。
A computer code FDKR and its associated data library AF-DCDLIB have been developed for fusion-fission hybrid reactor radioactivity calculations.
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