It occurs in Uranium ores as a by product of nuclear decay.

它作为一种原子核衰变的副产物，产生在铀矿石里。

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The organization structure of Chinese evaluated nuclear decay data file and its management program system are presented briefly.

简要介绍了中国评价核衰变数据库的组织结构及其库的管理程序系统与具体应用。

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The functions of this instrument include correction for nuclear decay, background subtraction and automatical detection of trouble.

仪器有核衰变修正、扣除本底和自动检测故障的功能。

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And the type of nuclear decay each isotope undergoes before it reaches a state.

FORBES: Uranium Stocks Looking Ugly Post-Fukushima As Short-Interest Rises

The electroweak force is a synthesis of two previously identified forces of nature, electromagnetism (itself a synthesis, carried out in the 19th century, of the electric and magnetic forces), and the weak nuclear force, which governs radioactive decay.

ECONOMIST: The 1999 Nobel prizes

And this whole topic completely ignores the other, even rarer form of Heliem, the Isotope Helium3, which is formed only as a biproduct of the radioactive decay of the Tritium used in making nuclear missiles.

FORBES: What Great Helium Shortage?