更妙的是，显然人们可以用放射性作为时钟，用衰变系列的半衰期计算出岩石的年龄。
Better still, it became apparent to him that one could use radioactivity as a clock, with the half-life of a decay series enabling us to calculate the age of a rock.
提出了放射性递次衰变系列中存在的长期平衡公式的证明问题，指出该问题可以利用巴特曼公式来解决。
The truth of the secular equilibrium formula in radioactive cascade decay series is proved with the use of the Bateman formula.
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