Because of the continuous decay, the quantity of radioactive material and the rate of emission of radiation decrease steadily.

由于连续衰变的结果，放射性物质的数量，辐射发射率都逐渐下降。

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A new method is presented for measurement of internal pressure of vacuum interrupters, having no use of magnetic fields but using decay velocity of emission current.

提出了一种无需施加磁场、利用发射电流衰减速度测量真空开关灭弧室真空度的新方法。

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The morphology, structure, and photoluminescence(PL) of the phosphors were investigated by transmission electron microscope(TEM), X-ray diffraction(XRD), emission spectra, and decay time.

以X射线衍射（XRD）、透射电子显微镜（TEM）、发射光谱和衰减时间谱等手段表征材料性能。

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The team of physicists was investigating the possibility of using radioactive decay rates to generate random numbers, since the rate is constant but the emission of individual atoms is unpredictable, it seemed like a perfect fit.

FORBES: Radioactive Decay Rates May Not Be Constant After All