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利用矿物或岩石中铀、钍裂变的碎片径迹来测定铀、钍含量及矿物年令的方法,是裂变径迹法在地质上的应用途径之一。早在1939年就发现铀在受到热中子轰击下,会产生裂变,但一直到1962年普赖斯(Price)等人用蚀刻法把裂变径迹扩大到可用普通光学显微镜进行观察研究之后,裂变径迹法才开始应用到地质研究上来。我国是在最近几年才开始开展这项工作的。1978年我们初次尝试使用诱发裂变径迹法(同时配合其他方法,如重砂分析、中子活化分析和电子探针分析等)确定岩石矿物的铀含量和了解铀在岩石矿物中的配分状况,初步获得了一些有益的结果。
One of the ways of using fission track method in geology is to use the trace of uranium and thorium fission in mineral or rock to determine uranium, thorium content and mineral year. As early as 1939, uranium was found to be fissile under the attack of thermal neutrons. However, until Price et al. Used the etching method to expand the fission track to the extent that ordinary optical microscopes could be used for observational studies in 1962, Fission track method began to be applied to geological research. Our country started this work only in recent years. In 1978, we first attempted to determine the uranium content of rock minerals by using induced fission-track method (along with other methods such as heavy sand analysis, neutron activation analysis and electron probe analysis) and to understand the distribution of uranium in rock minerals. Some preliminary results have been obtained.