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本研究方法探讨微量元素地球化学对氡(222Rn)含量在土壤和空气界面及大气中空间的影响。综合了不同的原地氡测量方法,并在1∶50000地质图和U、Th含量基础上进行岩石地球化学分类。以铀含量分布范围较广的变质岩和花岗岩为特征的法国西部的某海西期一稳定基底区,证实了本方法的优点。如果把各种岩性及其铀含量作为氡源的话,它们很可能是控制室外环境氡浓度的主要参数。事实上,氡最高浓度(在空气中≥100Bq·m-3,土壤表面≥100mBq·m-2·s-1)是在铀平均含量超过8×10-6的岩石(即相当于过铝质浅白色花岗岩或变质花岗岩的产铀花岗岩)上才会测得。
This study explored the effect of trace element geochemistry on the radon (222Rn) content at the soil-air interface and in the atmosphere. Different radon measurement methods are integrated and the lithogeochemical classification is based on 1: 50000 geological map and U and Th contents. A stable Hercynian basement region in western France, characterized by metamorphic rocks and granites with a wide distribution of uranium content, confirms the advantages of this method. If a variety of lithology and its uranium content as a source of radon, they are likely to be the main parameters of outdoor radon concentration control. In fact, the highest radon concentration (≧ 100 Bq · m -3 in air and ≧ 100 mBq · m -2 · s -1 on the soil surface) is found in rocks with an average uranium content of more than 8 × 10 -6 (ie, Pale white granite or metamorphic granite uranium granite) will be measured.