一、引言在铀矿地质研究、勘探和采掘工作中,分析地质样品中的铀、镭、钍的含量是十分重要的。γ射线能谱法无需对样品进行放化分离和制成薄源,因此是测定地质样品中铀、镭、钍比较理想的方法。目前采用较多的是β-γ、β-γ-γ、β-γ-γ-γ法。由于自然界三个天然放射性衰变系列中的各核素经常处于不平衡状态,在地质样品中这些核素所发射的γ射线中,各谱 I. Introduction It is very important to analyze the contents of uranium, radium and thorium in geological samples in uranium geological research, exploration and mining. γ-ray spectrometry method without the need for sample radiochemical separation and made thin source, it is the determination of geological samples of uranium, radium, thorium is a more ideal method. Currently used more of β-γ, β-γ-γ, β-γ-γ-γ method. Due to the nature of the three natural radioactive decay series of nuclides are often in an imbalance in the geological samples of these radionuclides emit gamma rays, the spectrum