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。
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。
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。
This paper reports the measurement of Poission or Guassion statistic distributions of nuclear decay controlled by a single board computer.
本文介绍了用单板机控制测量核衰变统计分布——泊松及高斯分布。
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。
But that assumption was challenged in an unexpected way by a group of researchers from Purdue University who at the time were more interested in random Numbers than nuclear decay.
但是普渡大学的一组研究者用意想不到的方式挑战了衰变速率恒定这个假设。相比于原子核衰变，他们对随机数更感兴趣。
The principle of simulation of the statistics counting of radioactive nuclear decay based on the rejection method is presented, and the simulation is implemented with TC programming.
本文从原理上分析了采用舍选法进行随机抽样，得到符合放射性衰变统计规律的模拟计数值，并用TC进行了编程实现；
This paper summarized the research present situation of nuclear chemistry, mainly expounded the nuclear chemical reaction principle, including nuclear decay, nuclear fission and nuclear fusion.
综述了核化学的研究现状。主要阐述了核化学的反应机理，包括衰变，聚变和裂变；
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)。
Only gravity and a phenomenon called the weak nuclear force, which governs some types of radioactive decay, can bind them—hence the term “weakly interacting”.
只有重力和一种可以支配某些放射性衰变的弱核力能够使其聚集凝固，“弱反应”这一术语由此得名。
Quantum tunneling is involved in many physical processes, such as radioactive decay and the nuclear fusion that takes place in the Sun.
量子隧穿发生在许多的物理过程中，比如说放射性衰变和太阳上发生的核聚变。
By calling them “weakly interacting”, physicists mean that the particles experience another of the four fundamental forces, namely, the weak nuclear force that is responsible for radioactive decay.
之所以称其为“弱作用”，是为了指出粒子受到四大基本力中的另一种——由放射性衰变所产生的弱核力（四大基本力是：引力、电磁力、强力、弱力）。
Some byproducts of the nuclear fission are themselves radioactive.These decay, producing heat.
有些核裂变产生的副产品自身具有放射性。这些物质的衰变，也在产生热能。
Decay rates of the radioactive fallout are the same for any size nuclear device.
核辐射尘降物的衰减率不应核装置的大小而改变。
This is because radioactive nuclear elements are formed in the giant outbursts of energy, and some of these decay by releasing positrons.
这是因为放射性核素在这巨大的爆炸能量中形成，其中一些放射出正电子而衰变。
In a nuclear magnetic resonance measurement, the decay, or relaxation, caused by dephasing in an inhomogeneous magnetic field.
核磁共振测量中，由于不均匀磁场相位滞后引起的驰豫或衰减。
Researchers have demonstrated a penny-sized "nuclear battery" that produces energy from the decay of radioisotopes.
研究人员展示了一块一便士大小的“核能电池”，该电池可利用放射性同位素的衰变产生电能。
In this paper the progress and prospect of utilization of nuclear energy (decay, fission and fusion energy) are reviewed.
本文评述了核能(衰变能、裂变能、聚变能)利用的现状和前景。
Neutrinos are created as a result of certain types of radioactive decay or nuclear reactions such as those that take place in the Sun, in nuclear reactors, or when cosmic rays hit atoms.
中微子是创建作为放射性衰变或核反应，如某些类型的结果，在阳光下放置在核反应堆，或当宇宙射线撞击原子。
Neutrinos are created as a result of certain types of radioactive decay or nuclear reactions such as those that take place in the Sun, in nuclear reactors, or when cosmic rays hit atoms.
中微子是创建作为放射性衰变或核反应，如某些类型的结果，在阳光下放置在核反应堆，或当宇宙射线撞击原子。
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