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.
1932年，氧化钍胶体被首次引进。
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.
镭、铀和钍都属于放射性金属元素。
Radium, uranium, and thorium are radioactive metallic elements.
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.
为了未来的钍基熔盐核反应堆。
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.
铅钍石是钍石的新变种，属首次发现。
The plumbothorite discovered for the first time is a new variety of thorite.
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.
中国大力研发钍能，将改变世界能源景观。
China's dash for thorium power could alter the energy landscape.
铀或钍矿砂及其精矿。
用萃取色层法分离钍。
钾、磷、钍是月岩可向将来的采矿企业提供的其它元素。
Potassium, phosphorus and thorium are other elements that lunar rocks have to offer a potential mining venture.
这显然证实了检测钍。
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.
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.
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.
该队的测量发现钍的总体格局丰富的重元素，为这个目的。
The team's measurement of thorium revealed the overall abundance pattern of heavy elements for this object.
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.
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.
上述结果表明钍在体外可直接诱发金黄地鼠胚胎细胞的恶性转化。
The above results indicated that malignant transformation of golden hamster embryo cells was directly induced by thorium dioxide in vitro.
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.
举例来说，计算表明，钍- 229的原子核内存在着能发出紫外线的转变过程。
Calculations suggest, for instance, that in the nucleus of the isotope thorium-229 is a transition that should emit ultraviolet rays.
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.
他们用皮埃尔所发明的仪器来进行测量。玛丽注意到钍元素也是具有放射性的。
Using Pierre’s invention to make the measurements, Marie noted that thorium was radioactive.
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.
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.
提出了一种用于钍基先进核能系统压力管与排管之间的非能动热开关设计方案。
The paper presents a design of passive heat-switch between pressure tube and calandria tube of Thorium-based Advanced Nuclear Energy System.
我国有些地区和某些类型住房中钍射气浓度较高，有必要加强这一问题的研究。
The indoor thoron concentration in some areas and some kind of houses is higher, the study in this field should be strengthened.
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