湘江流域大气降水中痕量铀的裂变径迹法测定

大气降水是地表水和地下水的重要来源,因此与人类生活有着密切的关系。近些年来人们对大气降水的酸度引起了普遍关注,并对其形成和危害等方面做了探讨。对降水中一些阴、阳离子浓度及其变化进行了观测,但对降水中天然放射性铀的测定尚不多见。本文利用裂变径迹法测定了湘江流域部分地区以及北京市中关村某些降水中的含铀量.初步探讨了大气降水中铀的可能来源及其差异的原因。

DETERMINATION OF TRACE URANIUM IN ATMO-SPHERIC PRECIPITATION OF THE XlANGJlANG RIVER VALLEY BY FISSION TRACK METHOD

In this work the uranium contents in atmospheric precipitations in the region of the Xiangjiang River valley have been measured by fission track method, which range from 0.008 to 1.5 ppb. The majority of them are below 0.1 PPb. The uranium contents in the samples from different geographical positions are obviously different.Sometimes the differences in uranium contents of the samples from the same area collected at different times are also great A preliminary discussion is given on the sources of uranium in atmospheric precipitation and the reason of the difference in contents