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。
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。
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。
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。
A diagnostic imaging arrangement comprises a magnetic resonance examination (1) system to acquire magnetic resonance signals and an emission tomography system (2) to acquire nuclear decay signals.
一种诊断成像装置包括用于获取磁共振信号的磁共振检查(1)系统和用于获取核衰变信号的发射断层摄影系统(2)。
Calculates the natural ventilation rate by the tracer gas decay method. Explores the definition of the indoor criterion of carbon monoxide concentration and the carbon monoxide emission from cars.
利用示踪气体法计算了地下停车库的自然通风量，并讨论了地下汽车库内一氧化碳允许浓度和小汽车一氧化碳排放量的确定。
The characteristics of the decay distribution of spontaneous emission from an assembly of atoms in photonic crystals with pseudogaps are described.
介绍了三维赝带隙光子晶体中原子集合的自发辐射衰减分布特性。
The characteristics of the decay distribution of spontaneous emission from an assembly of atoms in photonic crystals with pseudogaps are described.
介绍了三维赝带隙光子晶体中原子集合的自发辐射衰减分布特性。
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