考古学家确定地质、古墓等年代的方法之一是用放射性同位素作为“时钟”,来测量漫长的时间,这叫做放射性同位素鉴年法。本文结合例题简单谈谈几种同位素鉴年法的原理,供教学时参考。1238U与206Pb比鉴年法238U在岩石中经一系列的衰变,最后成为206Pb,测出现存的206Pb与238U的存量 One of the archeologists’ methods for determining the age of geology and ancient tombs was to use radioactive isotopes as a “clock” to measure long periods of time. This is called radioisotope dating. This article briefly discusses the principle of several isotopic dating methods with reference to examples, for reference when teaching. The 1238U and 206Pb ratio dating method 238U was a series of decays in the rock, eventually becoming 206Pb, measuring the stock of 206Pb and 238U that existed.