衰变链又称放射系(radioactive series)或级联衰变(series decay)。一个连续的核素，其中某一个核素经放射性衰变而转化成下一个核素，直到达于一个稳定核素。
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.
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.
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