Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.
氦是钍和铀元素数千年放射性衰变的副产品。
These minerals can be dated by radioactive decay techniques because of the very small quantities of radioactive trace elements they, in turn, contain.
这些矿物可以用放射性衰变技术测定年代，因为它们所含的放射性微量元素非常少。
This process is also called radioactive decay.
这个过程就叫放射衰变。
Unlike helium - 4, it cannot be produced by radioactive decay.
与氦-4不同之处是，氦- 3不能由放射性衰变产生。
Radon is a gas that comes from the radioactive decay of radium in rocks.
氡是来自岩石中镭辐射衰变而产生的气体。
Radon is a gas that comes from the radioactive decay of radium in rocks.
氡是来自岩石中镭辐射衰变而产生的一种气体。
Rutherford first identified the action of probability in radioactive decay.
卢瑟福首先认识到几率在放射性衰变中的作用。
Alpha particles are these helium nuclei, and they are the result of radioactive decay.
阿尔法粒子是氦核，它们是放射性衰变的产物。
Chemistry also USES calculus in determining reaction rates and radioactive decay.
化学也使用演算在确定反应速率和放射性衰变。
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
粒子是从天然放射性蜕变得到的带正电的氦核。
Each element has at least one isotope with unstable nuclei that can undergo radioactive decay.
每个元素至少有一个同位素不稳定原子核可以进行放射性衰变。
It had been used for practical ends, to identify elements and to unravel radioactive decay chains.
已将其用于实践的目的，去鉴别元素和阐明放射性衰变系。
Its stable isotopes are all end products of radioactive decay of uranium and other heavy elements.
其稳定的同位素为铀和其它重金属放射衰变后的最终产物。
Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.
几种氡的同位素的放射性气体，是放射性物质衰变的产物。
These radionuclides undergo radioactive decay, by emitting harmful alpha particles, beta particles or gamma rays.
它们在衰变期间会放出对人体有害的粒子粒子或射线。
Inlarge parts of the ocean, the seafloor is made of thick, heavy clay, perfectfor absorbing radioactive decay products.
在海洋的大部分区域，海床都由厚重的粘土构成，最适合吸收放射性衰变产物。
However, some of the minerals contain xenon isotopes unlike those usually produced by radioactive decay of uranium.
然而，有些含氙同位素的矿物并非如此，是由铀的放射性衰变产生的。
His advice to Purdue: Look for evidence that the changes in radioactive decay on Earth vary with the rotation of the sun.
他向普渡大学的研究者提出建议：寻找地球上放射性元素衰变速率的变化同太阳自转的关系。
The ash contains minerals such as zircon that can be dated precisely from the radioactive decay of some of their components.
这些火山灰中含有锆石等矿物，这些矿物中的某些组分允许进行精确的放射性测年(以确定精确的年代数据)。
It results from cosmic rays reaching the earth from the outer space, and from the radioactive decay of mineral in the soil.
它来自星际空间抵达地球的宇宙射线，来自土壤中矿物质的放射性衰变。
At an intermediate scale, however, they areoccasionally amplified to become observable, for example when wemeasure radioactive decay.
在中间尺度上，量子效应偶尔会被放大以致可被观察到，例如我们在测量放射性衰变的时候。
TRNGs are usually based on physical phenomena such as thermal noise, atmospheric noise, radioactive decay and even coin-tossing.
真随机数发生器的熵源通常来自于真实的物理世界，如热噪声，大气噪声，放射性衰减甚至掷硬币。
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。
But rather than test the radioactive decay using just one method, the researchers used three, involving the elements lead, samarium and neodymium.
但是，相对于仅使用一个方法测试放射性衰变，研究人员测定时使用了三种元素，铅，钐，钕。
The process by which an atom changes from an unstable state to a more stable state by emitting radiation is called radioactive decay or radioactivity.
原子通过辐射由不稳定状态转变为更加稳定状态的过程称为放射性衰变或放射性。
The process by which an atom changes from an unstable state to a morestable state by emittingradiation is called radioactive decay or radioactivity.
这种原子通过释放射线从不稳定状态变到更加稳定的状态的过程被称为核衰减或放射。
Mathematical relationship between Rn daughter concentrations and ventilation, adhesion and deposition, and radioactive decay was developed in the paper.
本文给出了氡子体浓度和通风、附着和沉积、以及放射性衰变之间的关系。
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。
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。
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