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.
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.
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.
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.
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.
以512矿床为例，研究了砂岩铀矿体铀、钍含量及其放射性同位素分布规律，由此讨论铀矿体的定位条件。
Exemplified by No. 512 uranium deposit, this paper discusses the delineation of ore bodies in sandstone type uranium deposits by uranium and thorium concentrations and their radioisotopes.
以512矿床为例，研究了砂岩铀矿体铀、钍含量及其放射性同位素分布规律，由此讨论铀矿体的定位条件。
Exemplified by No. 512 uranium deposit, this paper discusses the delineation of ore bodies in sandstone type uranium deposits by uranium and thorium concentrations and their radioisotopes.
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