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 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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A reconstruction module (5) reconstructs a motion corrected emission tomographic image from the nuclear decay signals on the basis of the motion correction.

重构模块(5)在运动校正的基础上根据核衰变信号重构经运动校正的发射断层摄影图像。

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

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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?