最近2-3年为研究花岗岩中铀的配分问题,我们对岩体人工重砂中分选出的晶质铀矿进行了电子探针分析,共积累了几十个晶质铀矿的分析数据。根据以往晶质铀矿铅同位素的质谱分析资料,其中的铅大部分为放射成因铅,而普通铅所占的比例甚小(见表1)。法国的朗香曾用电子探针对晶质铀矿颗粒测定的U、Th、Pb含量计算过法国中央地块二云母花岗岩 In the recent 2-3 years, in order to study the distribution of uranium in granite, we conducted an electronic probe analysis of the crystalline uranium ore sorted out by artificial heavy sand in rock mass, accumulating dozens of analytical data of uraninite . According to the mass spectrometry data of lead isotopes of crystalline uranium deposits in the past, most of the lead is lead-induced radioactivity, while the proportion of ordinary lead is very small (see Table 1). French Longxiang electron probe has been used for the determination of crystalline uranium particles U, Th, Pb content of the French central massif mica granite