Great changes of uranium isotope separation methods have been made in the past 10 years.
近十年来，铀同位素分离方法发生了很大变化。
In this paper, a short outline of general principles and methods of laser isotope separation is discussed. A general review is made on methods and progress of uranium isotope separation.
本文概述了激光分离同位素的一般原理和方法，并对分离铀同位素的方法和进展作了评述。
In this case the geologists drilled into the stalagmites and estimated their age from the way that uranium decays into an isotope of thorium.
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。
To make fuel for electricity-generating reactors, uranium is enriched to less than 5 percent of the isotope U-235.
为将燃料做成电能反应堆，铀被浓缩至U-235同位素含量5%以下。
It is made up of old fuel rods that have become sufficiently depleted of uranium-235, the isotope that drives a reactor’s main chain reaction, to be no longer useful.
乏燃料由完全耗尽铀-235的旧燃料棒组成，核反应堆的链式反应就是由铀-235激发的。
The crust granites have higher lead isotope ratios and are richer in uranium lead but poorer in thorium lead.
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；
On the basis of principle of uranium-lead isotope system evolution, the viewpoint of uranium mobilized mineralization has been proved;
根据铀-铅同位素体系演化原理论证了铀的活化成矿观点；
On the basis of principle of uranium-lead isotope system evolution, the viewpoint of uranium mobilized mineralization has been proved;
根据铀-铅同位素体系演化原理论证了铀的活化成矿观点；
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