1.绪言笔者们从1955年开始进行了花岗岩接触带放射性分布的研究,发现在横切接触带的线上,根据岩体不同,其放射性强度的分布也有显著的差异,这对了解接触机构是一个很好的暗示。到目前为止已测定完167个点,包括本州、四国、九州等地区。这次对这些测定结果作了总结,对具有代表性的一些样品结合β放射性和光谱分析的测定结果进行了考察。 1. INTRODUCTION The authors conducted a study on the radioactive distribution of the contact zone of granite since 1955 and found that the distribution of radioactive intensity varies significantly with the rock mass on the line crossing the contact zone. A good suggestion. To date, 167 points have been measured, including Honshu, Shikoku and Kyushu. The results of these measurements were summarized this time, and some representative samples combined with beta radioactivity and spectral analysis were examined.