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以铀系、钍系、锕系为主的放射性核素广泛分布在地壳上.非铀矿山,如煤矿、金属和非金属矿同样存在铀、钍放射性核素。一般情况下非铀矿山井下矿岩中的铀、钍含量常常高于地壳中的平均值,局部地方甚至接近和超过铀矿开采工业的边界品位。据调查,我国井下煤矿中,矿岩或煤层铀的品位为百万分之几到万分之几.~(233)U 是放射性气体~(222)Rn 的母体。氡形成之后,经扩散、渗流,由岩石、土壤表面进入大气,并衰变成子体,所以氡及其子体的危害不仅铀矿山存在,非铀矿山包括煤矿也存在。
Uranium, thorium, actinide-based radionuclides are widely distributed in the crust.Non-uranium mines, such as coal mines, metals and non-metallic minerals also exist uranium, thorium radionuclides. In general, the uranium and thorium contents in the ore of non-uranium mines are often higher than the average value in the crust and even close to and surpassing the boundary grade of uranium mining industry in some places. According to the survey, the grade of uranium in ore or coal seam in China’s underground coal mines is in the range of a few thousandths to several ten thousandths. ~ (233) U is the parent of radioactive gas ~ (222) Rn. After the formation of radon, the radon and its daughters not only exist uranium mines, but also non-uranium mines, including coal mines, through diffusion and seepage, entering the atmosphere from rock and soil surfaces and decaying into the daughter bodies.