各种岩石或矿物中都含有微量铀杂质,~(238)U原子核以一定速率产生自发裂变,每一自发裂变放出的两个碎片在绝缘质岩石或矿物中产生一条连续的辐射损伤径迹,这种径迹可用化学蚀刻法显影和用普通光学显微镜观察。在常温下,矿物中的辐射损伤径迹可长期保留,在高温 All kinds of rocks or minerals contain trace amounts of uranium impurities. The ~ (238) U nuclei produce spontaneous fission at a certain rate. Two fragments released by each spontaneous fission produce a continuous radiation damage track in the insulating rocks or minerals. This track can be chemically etched and visualized using an ordinary light microscope. At room temperature, radiation in mineral damage track can be long-term retention, at high temperatures