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。

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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。

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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。

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At the time, Mr David said that radiation from the uranium isotope had ruined his health and robbed him of the ability to earn a living.

BBC: NEWS | UK | England | Somerset | Uranium High Court battle resumes

The uranium in the cake is almost entirely the stable isotope uranium 238.

FORBES: Companies, People, Ideas

What they failed to appreciate, and what the company failed to tell them, was that a fast-breeder uses fuel that has a 19% concentration of the fissile isotope of uranium, 235U. Ordinary nuclear reactors use fuel containing around 3% of the fissile isotope.

ECONOMIST: All over in a flash