贵州省部分煤矿氡浓度及放射性水平的研究

Research on Radon Concentration and Radioactivity Level of Part Coal Mine in Guizhou Province

目的 研究和评价贵州省地下煤矿氡气浓度和放射性水平.方法 在贵州省4县、区13个地下煤矿进行矿井内氡浓度、煤矿天然放射性核素含量、煤矿γ外照射水平测量.结果 此次调查的煤矿矿井内氡浓度为31.7～351.7 Bq/m^3;煤矿放射性核素226 ^Ra为14.1～1 573.5Bq/kg、232 ^Th为13.8～40.2 Bq/kg、40K为小于探测下限值～497.2 Bq/kg;煤矿的γ外照射水平为4～48（×10^-8Gy/h）.结论 此次被调查的煤矿均采用效果良好机械通风方式,故所测量的氡浓度未达到干预水平 .部分放射性核素较高的煤及产生的煤渣将会对堆放的环境以及煤渣的再利用产生一定影响.

Objective To research and assess radon concentration and radioactivity level of part coal mine in Guizhou province. Methods To measur the radon concentration in well, analyze the content of nature radionuclide,measure γ, radiation levels, survey 13 underground coal mine in 4 county of Guizhou province. Results In this survey, radon concentration between 31.7 and 351.7 Bq/m^3 ; content of nature radionuclide in coal, 226^Ra is between 14.1 and 1 573.5 Bq/kg, 232^Th is between 13.8 and 40.2 Bq/kg,40^K is between less than LLD （ lower limit of detection ） and 497.2 Bg/kg,γ radiation levels is between 4 and 48 （ × 10 ^-8Gy/h）. Conclusion By using mechanical ventilation facility, there is good ventilated rate in the well of coal mine, therefore the radon concentration is lower using^[1,2]. Coal with high radioactivity level and residue will be harmful to environment of storing site, affective the reuse of residue.