Better still, it became apparent to him that one could use radioactivity as a clock, with the half-life of a decayseries enabling us to calculate the age of a rock.
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。
2
The truth of the secular equilibrium formula in radioactive cascade decayseries is proved with the use of the Bateman formula.
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。
3
The influences of pipe materials and organic substances to decay of chlorine series disinfectants were studied.