Radioactive tritium has leaked from three-quarters of U. S. commercial nuclear power sites, often into groundwater from corroded, buried piping.

美国四分之三的商业核电站均存在放射性氚泄露，通过埋在地底下的被腐蚀的管道进入地下水。

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Radon is a gaseous substance of radioactive. It exists widely in groundwater and atmosphere: or in pores of soil and rock.

前言：氡是气态的放射性物质，它广泛存在于岩石和土壤的孔隙中、地下水中和空气中。

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This study deals with the research achievement in aspect of groundwater exploration with techniques of isotopic and radioactive measurements.

本文举例论述了应用同位素及射线测量技术开发这类地下水的研究成果。

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