目前仪器分析低含量铀、钍的最佳方法是中子活化,质谱以及激光荧光法。自75年以来,不少研究单位已开始使用X荧光光谱法分析地质样品中的低含量铀和钍。其优点是制样简单,分析速度快,而且除了铀、钍含量外,还可同时测定诸如铷、锶、铅和钾等元素的含量。但到目前为止,人们 At present, the best method of instrument analysis of low content of uranium and thorium is neutron activation, mass spectrometry and laser fluorescence method. Since 75 years, many research institutes have begun to use X-ray fluorescence spectrometry to analyze low levels of uranium and thorium in geological samples. Its advantage is simple sample preparation, analysis speed, and in addition to uranium, thorium content, but also the determination of such as rubidium, strontium, lead and potassium and other elements content. But so far, people