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.
铀元素之后的元素，是人工合成的。
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.
一种放射性超铀元素在用氦核子轰击时发现。
A radioactive transuranic metallic element produced by bombarding with helium nuclei.
研究了在HEDPA介质中TRPO对超铀元素的萃取性能。
Extraction of transuranium elements from HEDPA medium by TRPO is studied.
目前全世界大约有130个使用武器级铀元素的研究反应堆。
There are about130research reactors around the world running on weapons-grade uranium.
目前全世界大约有130个使用 武器级铀元素的研究反应堆。
There are about 130 research reactors around the world running on weapons-grade uranium.
本文介绍了超铀元素的环境水平，对它们的放射化学分析的进展进行了述评。
An introduction to environmental level of transuranium elements and a review of the recent advance in radiochemical analyses of them are made.
本文讨论了超铀元素存在的“空间限制”、“时间限制”和“生成截面限制”。
Some problems are discussed in this paper which is"spale-restriction", "time-restriction"and"cross-section-restriction on the transuranium s limit".
锘在锕类元素中的一种放射性超铀元素，人工微量制造，其最长寿命的同位素是锘255，其。
A radioactive transuranic element in the actinide series, artificially produced in trace amounts. Its longest-lived isotope is No255 with a half-life of3 minutes. Atomic number102.
超铀元素与地下水中可能存在的无机及有机配位体的络合会影响它们在水中的浓度及其迁移行为。
The complexation of TRU element with inorganic or organic agents may have impact on their concentrations in groundwater and their migration behavior.
断裂构造存在证据和分布特征研究表明，鄂尔多斯盆地断裂构造发育，且对铀元素分布具有重要作用。
The evidence and feature of the structure and fracture indicates that they are developing and play a important role in uranium distributions.
相关研究表明，盆地深部和浅部的铀异常具有一定的关系，盆地历经的沉积环境变迁是铀元素富集的主导因素。
The activation and accumulation aroused the abnormity of natural gamma. There is a certain correlation in shallow and deep abnormality of uranium.
叙利亚本周无视一项早已被泄露的报告：国际原子能调查员已经在去年被以色列轰炸的核设施里发现了铀元素的踪迹。
Syria dismissed a leaked report that nuclear inspectors had found traces of uranium at an alleged nuclear facility that was bombed by Israel last year.
伊朗曾有一份文件，是关于如何将铀元素塑成球形，这项技术只能用来制造武器。许多国家至今未得到满意的答复。
Other countries have yet to get a satisfactory explanation as to why Iran had a document on shaping uranium metal into spheres, a trick useful only for making weapons.
在此之前不久，另外有位科学家发现过铀元素放出射线的现象。于是玛丽便决定在这方面进行研究，以获取博士学位。
Not long before another scientist had found that uranium gave off rays, so Marie decided to study this area for her doctor's degree.
伊朗是迄今为止唯一的、在尚未拥有哪怕一座需要以本国铀元素充当堆芯燃料的已运作反应堆之前却已建成铀浓缩工厂的国家。
Iran is the only country so far to have built a uranium-enrichment plant before having even a single working reactor that would need its uranium as fuel for the reactor core.
她关于铀的理论可以解释她的团队的矿石样本中43号元素的存在。
Her theory about uranium would have explained the presence of element 43 in her team's ore sample.
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.
铀，碘，铯等元素在一定的半衰期内都可以释放出上述射线。
These rays are emitted during the decay of certain versions of uranium, iodine, cesium and other elements.
煤中的铀和其他元素的放射性可能只对矿工产生实际的健康危害，Finkelman解释说。
Radiation from uranium and other elements in coal might only form a genuine health risk to miners, Finkelman explains.
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.
一些如铀一般的元素，通常在核电厂用作核燃料，都是有放射性的；这些元素由于自身的性质是没有无放射性状态的。
Some elements such as uranium, commonly used as fuel in nuclear power plants, are always radioactive; there is no nonradioactive form of them that naturally occurs in nature.
它产生于铀衰变链中的镭，而铀是所有岩石和土壤中都能找到的一种元素，含量各不相同。
It is produced from radium in the decay chain of uranium, an element found in varying amounts in all rocks and soil.
它产生于铀衰变链中的镭，而铀是所有岩石和土壤中都能找到的一种元素，含量各不相同。
It is produced from radium in the decay chain of uranium, an element found in varying amounts in all rocks and soil.
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