本文是一篇用γ能谱法放射性测定岩石标本中铀、镭、钍、钾克拉克含量的实验报告。文中叙述了该法的理论基础及选择工作条件的依据。论述了样品的不同物质化学成分和装填密度的对该法分析结果的影响。讨论了该法的灵敏度、精确度和准确度。最后提出了改进测量方法和探测器,以提高分析灵敏度。 This article is an experimental report of radioactive determination of uranium, radium, thorium, potassium and carat contents in rock samples by γ-ray spectrometry. The article describes the theoretical basis of the law and the basis for the selection of working conditions. The effects of chemical composition and packing density of different samples on the analytical results of the method are discussed. The sensitivity, accuracy and accuracy of this method are discussed. Finally, improved measurement methods and detectors are proposed to improve the analysis sensitivity.