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1·The decay pathways in successive decay chain were coded with binary digits.

用二进制数对递次衰变链的衰变路径进行编码。

2·It is produced from radium in the decay chain of uranium, an element found in varying amounts in all rocks and soil.

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。