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1·Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.

氦是钍和铀元素数千年放射性衰变的副产品。

2·These minerals can be dated by radioactive decay techniques because of the very small quantities of radioactive trace elements they, in turn, contain.

这些矿物可以用放射性衰变技术测定年代，因为它们所含的放射性微量元素非常少。

3·This process is also called radioactive decay.

这个过程就叫放射衰变。

4·Unlike helium - 4, it cannot be produced by radioactive decay.

与氦- 4不同之处是，氦- 3不能由放射性衰变产生。

5·The point of the experiment is that radioactive decay is a quantum process.

这项实验的关键因素在于放射性衰变是一个量子过程。

6·Radon is a gas that comes from the radioactive decay of radium in rocks.

氡是来自岩石中镭辐射衰变而产生的气体。

7·Radon is a gas that comes from the radioactive decay of radium in rocks.

氡是来自岩石中镭辐射衰变而产生的一种气体。

8·Rutherford first identified the action of probability in radioactive decay.

卢瑟福首先认识到几率在放射性衰变中的作用。

9·Alpha particles are these helium nuclei, and they are the result of radioactive decay.

阿尔法粒子是氦核，它们是放射性衰变的产物。

10·Chemistry also USES calculus in determining reaction rates and radioactive decay.

化学也使用演算在确定反应速率和放射性衰变。