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某铁矿的矿体成分复杂,伴有少量放射性物质,铀镭为地壳水平,ThO_2含量为0.006—0.043％,平均0.02％。钍为一种天然放射性元素,它在衰变过程中主要释放出氢及其子代产物。按国内外有关资料报导,如不防护.一定量的钍及其子代产物侵入体内,对健康会造成一定的损害。鉴于该矿开采已有相当长的时间,该矿破碎车间空气中粉尘的含量超过国家允许标准数倍至数十倍。遵循“一个正确的认
The ore body of a certain iron ore is complex in composition with a small amount of radioactive material. The uranium radium is crustal level, and the content of ThO 2 is 0.006-0.043% with an average of 0.02%. Thorium is a natural radioactive element that releases mainly hydrogen and its progeny products during decay. According to the relevant information at home and abroad, if not protected, a certain amount of thorium and its offspring invade the body, which will cause some damage to health. In view of the mining has been a long time, the mine crushing plant dust in the air more than the national allowable standards several times to several times. Follow "a correct recognition