... radioactive decay(放射性的衰变) radioactive clocks(放射性的时钟) Radiation and matter(放射线和物质) ...
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更妙的是,显然人们可以用放射性作为时钟,用衰变系列的半衰期计算出岩石的年龄。
Better still, it became apparent to him that one could use radioactivity as a clock, with the half-life of a decay series enabling us to calculate the age of a rock.
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