它作为一种原子核衰变的副产物，产生在铀矿石里。
仪器有核衰变修正、扣除本底和自动检测故障的功能。
The functions of this instrument include correction for nuclear decay, background subtraction and automatical detection of trouble.
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。
This paper reports the measurement of Poission or Guassion statistic distributions of nuclear decay controlled by a single board computer.
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 organization structure of Chinese evaluated nuclear decay data file and its management program system are presented briefly.
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 reconstruction module (5) reconstructs a motion corrected emission tomographic image from the nuclear decay signals on the basis of the motion correction.
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。
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.
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)。
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.
分析了子核具有三个激发态的典型核衰变情况下的级联校正情况，具体给出了测量滤材源的情况下具有代表性的符合校正因子计算的解析表达式。
The true coincidence correction for a specific three excited levels de-excitation case has been analyzed, and the typical analytical expressions of true coincidence correction factors have been given.
这么大的原子核不可能是稳定的，但在足够长的时间内，在真空附近组装一个原子核以观察真空的衰变是可能的。
A nucleus that large cannot be stable, but it might be possible to assemble one next to a vacuum for long enough to observe the decay of the vacuum.
氡很容易从地下释放到空气中并通过称为氡子核的短命衰变产物分解。
Radon escapes easily from the ground into the air, where it disintegrates through short-lived decay products called radon progeny.
阿尔法粒子是氦核，它们是放射性衰变的产物。
Alpha particles are these helium nuclei, and they are the result of radioactive decay.
它只是一个巧妙地通过衰变成锇和钽而假装成磁单极子的普通的铂原子核。
It was just a garden variety platinum nucleus pretending to be a monopole by cleverly decaying into osmium and tantalum.
氡子核在衰变时发射出放射性阿尔法粒子，这些粒子可附着于空气中的浮质、灰尘及其它粒子。
As radon progeny decay, they emit radioactive alpha particles and attach to aerosols, dust and other particles in the air.
一年后，他们成功地让两个元素的原子核聚变，创造出了他们的首个113号元素原子核，但过了不到千分之一秒，它就衰变了。
A year later, they successfully fused two atomic nuclei from these elements, creating their first nucleus of element 113, but it decayed in less than a thousandth of a second.
剩余核一般说来将发生一次放射性衰变。
The residual nucleus will, in general, undergo a radioactive transformation.
剩余核一般说来将发生一次放射性衰变。
The residual nucleus will, in general, undergo a radioactive transformation .
这四种新元素都是人造的，是由火花与原子核相互撞击并且循着放射性超重元素衰变的轨迹而发现的。
The four new elements, all of which are synthetic, were discovered by slamming lighter -nuclei into each other and tracking the following decay of the radioactive superheavy elements.
而大统一理论则预言在原子核中的核子将衰变，重子数守恒将被破坏。
However, the nucleons in nucleus will decay and baryon-number conservation may not be absolute according to the Grand unified theory.
不同衰变方式和半衰期的放射性核束在生物医学领域有不同应用。
Radioactive ion beams with different decay modes and half-lives can be applied in many aspects of bio-medical fields.
但核反应堆产生大量的核废物需要处理，而且核废物的存放既构成对人类及其环境的巨大威胁，又造成核废物所含剩余衰变能量的浪费。
But the nuclear rubbish produced by the nuclear reactor, which is to do harm to the people and environments and also waste the remain disintegration energy, is hoped to be well disposed.
在衰变时由原子核释放出能量。
During the disintegration energy is released from the nucleus.
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；
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；
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.
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