摘要
目的调查河北省唐山地区地下煤矿放射性水平。方法应用累积测量和瞬时测量技术对四个地下煤矿氡浓度和γ剂量率进行测量,以及用高纯锗γ谱仪对各煤矿的放射性核素活度浓度测量。结果对四个煤矿累积测量表明:矿区煤矿222Rn浓度约为50.1Bq/m3,220Rn约为38.4Bq/m3,矿井下γ剂量率约为108nGy/h;瞬时取样测量表明矿区煤矿中222Rn浓度约为60.8Bq/m3,矿区地表γ剂量率约为67nGy/h;煤矿中煤和矸石238U,226Ra,232Th,40K放射性活度浓度算术平均值分别为39.6,31.3,36.3,26.0Bq/kg。结论唐山地区地下煤矿氡浓度高于环境氡浓度,该矿区煤的放射性核素含量低于全国平均值,矿区归一化集体剂量4.76人mSv/万t。
Objective To investigate the level of radionuclide in underground coal mines at Tangshan district in Hebei province. Methods The radon concentration and γ dose rate of four underground coal mines were measured with accumulative method and instant method. The activity concentration of radionuclide was measured with high pure germanium （HPGe） spectrum. Result The accumulative measurement at four coal mines in the district show that 222 ^Rn concentration is 50.1 Bq/ m^3 , 220^Rn is about 38.4 Bq/m^3 and γ dose- rate of underground coal mines is 108nGy/h; Instant measurement indicates that radon concentration is 8.7 ± 17.0 Bq/m^3 and γ dose - rate is 67nGy/h at the earth surface; the arithmetic mean values of activity concentration of radionuclides for 238^U ,226^Ra,232^Th,40^K are 39.6,31.3,36.3,26.0Bq/kg, respectively. Conclusion Radon concentrations in underground coal mines are higher than that in the open environment. Contents of radionuclide of coal are all apparent lower than that of average of the whole country. The normalized collective dose is 4.67 man · mSv （Mt） ^-1 .
出处
《中国辐射卫生》
北大核心
2007年第1期14-16,共3页
Chinese Journal of Radiological Health
基金
国防科工委资助课题
编号:HHAQ
