氦是钍和铀元素数千年放射性衰变的副产品。
Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.
这颗晕星不同于大多数超新星，它吐出的许多元素比铁还重，其中包括放射性钍和铀。
Unlike most supernovae, this one spewed lots of elements far heavier than iron, including radioactive thorium and uranium.
当氦衰变成为氦-3相对于我们在太阳里看到的那它就可用了，因为地球上多数的氦-4是通过元素铀和钍自然放射性衰变而造成的。
What helium is available is depleted in helium-3 relative to what we see in the sun, because most of Earth's helium-4 is freshly made via natural radioactive decay of the elements uranium and thorium.
稀土矿山常常也含有放射性元素，比如铀和钍。
Rare earth mines often also contain radioactive elements, such as uranium and thorium.
理由是煤燃烧过后省些的煤灰含有放射性元素，尤其是铀和钍。
The reason is that the ash left over when coal is burned contains radioactive elements, notably uranium and thorium.
我们脚下深处是地狱般的岩石汤，在温度非常高的地球地幔中，有毒的铀、钍和钾元素的同位素释放出的辐射流不断地对这些岩石汤进行加热，使其保持高温。
Deep underneath your feet is a hellish stone soup, kept hot by a torrent of radiation from poisonous isotopes of uranium, thorium and potassium in the earth's superheated mantle.
地质学家在石笋上钻孔，使用铀衰变成钍的同位素的方法确定它们的年龄。
In this case the geologists drilled into the stalagmites and estimated their age from the way that uranium decays into an isotope of thorium.
从中微子工作计算出铀和钍约产出20太瓦。
The calculation from the neutrino work yields 20 terawatts for uranium and thorium.
该模型估计，铀和钍(一起)产生占地球产生的约44太瓦热量中的16太瓦。
That model estimated that uranium and thorium (together) accounted for about 16 terawatts of the approximately 44 terawatts of heat produced by the Earth.
与铀相比，钍的储藏量更为丰富，能量密度也更高。
Compared to uranium, thorium is far more abundant as well as much more energy-dense.
出于所有这些理由，越来越多的科学家和能源专家认为，主要核燃料应该从铀转换成钍。
For all of these reasons, a growing number of scientists and energy experts believe that the world should switch from uranium to thorium as its primary nuclear fuel.
日本的KamLAND探测器可以检测衰变的铀和钍产生的反中微子，这两种元素产生了地球放射热量中的很大部分。
The KamLAND detector in Japan can detect anti-neutrinos generated by the decay of uranium and thorium-the two elements responsible for most of the radioactive heating of the Earth.
铀或钍矿砂及其精矿。
镭、铀和钍都属于放射性金属元素。
Radium, uranium, and thorium are radioactive metallic elements.
西方公司打算扩大中国以外的稀土矿产量，但这其中储量较大的稀土矿比中国华南的稀土矿复杂的多，这些矿往往伴生着放射性的铀和钍，开采起来很复杂。
Companies want to expand production outside China, but most rare-earth deposits, unlike those in southern China, are accompanied by radioactive uranium and thorium that complicate mining.
少数元素，其中有铀和钍，通过它们核的变化自然蜕变成较轻的元素。
A few elements, among them uranium and thorium, spontaneously disintegrate into lighter elements by chances.
介绍了一种测定滑石粉中放射性核素铀钍的简便、快速且灵敏的方法。
A simple, quick, and sensitive method to determine the radioactive nuclides of uranium and thorium in talc is described.
本文介绍了用(232u)作示踪同位素，测定岩石、土壤、水体中铀同位素及岩石中钍同位素比活度的方法。
This paper presents a determination method of specific activity for uranium isotope in rocks, soil, water and thorium isotope in rocks using 232u as a tracer isotope.
铀元素随后缓慢分解为另一种元素钍。
Followed by the slow decomposition of uranium to another element thorium.
铀矿山坑道污水含有铀、镭、钍、钋等放射性核素，外排前必须加以处理。
There are some radioactive nuclides such as uranium, radium, thorium and polonium in pit effluent of uranium mine.
壳型花岗岩具较高的铅同位素比值和富铀铅贫钍铅的特点；
The crust granites have higher lead isotope ratios and are richer in uranium lead but poorer in thorium lead.
通过塔里木盆地不同层系沉积岩石中放射性元素铀、钍、钾的含量实测数据，计算了不同岩石的生热率。
The paper presents the heat generation rate on the bases of measurements of the contents of uranium, thorium and potassium for different types of sedimentary rock in Tarim basin.
有三个天然存在的放射系列，即钍系、锕系和铀系。
There are three naturally occurring radioactive series - the thorium series, the actinium series, and the uranium series.
在条件实验的基础上提出了一个从中能18o离子照过的天然铀样品中简便、快速地分离钍的化学流程。
Based on the experiments, a chemical procedure used for rapidly separating thorium from the natural uranium irradiated by 18o ions was developed.
本文还讨论了铀、钍的来源、搬运形式和沉淀机理。
The sources, forms of transportation and precipitation mechanisms of uranium and thorium are also discussed in this paper.
铅同位素研究揭示，该板块富铀、钍，从而为铀矿省的形成提供了必不可少的地质前提。
The plate is enriched in U and Th revealed by Pb-isotopic study, which plays an role of essential prerequisite for the formation of U province.
与国外相比，除了肾铀浓度明显偏低和肺钍浓度偏高外，其他数值基本相当。
Apart from the lower uranium concentration in kidney and higher thoron concentration in lung, the related other values are roughly similar with those reported abroad.
与国外相比，除了肾铀浓度明显偏低和肺钍浓度偏高外，其他数值基本相当。
Apart from the lower uranium concentration in kidney and higher thoron concentration in lung, the related other values are roughly similar with those reported abroad.
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