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调查山东省某金矿氡浓度、矿石放射性核素活度浓度及γ空气比释动能率,估算矿工接受年有效剂量。利用固体径迹探测器CR-39测量金矿222 Rn、220 Rn浓度;利用高纯锗γ谱仪分析矿石226 Ra、232 Th4、0 K活度浓度;利用环境剂量计测量γ空气比释动能率。结果表明,测量期间矿井下氡浓度由高到底依次为:第2期(2007年6—10月)为2130Bq/m3、第1期(2007年2—6月)为923Bq/m3和第3期(2007年10月—2008年2月)为577Bq/m3。全年氡浓度平均值为1210Bq/m3,氡及其子体所致矿工年有效剂量为7.6mSv。提示,该矿应采取加大通风能力等措施降低井下氡浓度;对井下矿工应按照职业照射人员的要求开展职业健康监护。
The concentration of radon in a gold mine, the activity concentration of radionuclides and the kerma rate of γ air in a gold mine in Shandong Province were investigated to estimate the annual effective dose received by miners. The 222 Rn and 220 Rn concentrations of gold ore were measured by solid track detector CR-39. The activity concentrations of 226 Ra and 232 Th4,0 K ore were analyzed by high-purity germanium γ spectrometer. The γ-air kerma ratio Rate. The results show that during the survey, the concentrations of radon in the mine from high to low are as follows: the second phase (June-October 2007) is 2130Bq / m3, the first phase (February-June 2007) is 923Bq / m3 and the third phase (October 2007 - February 2008) was 577 Bq / m3. The annual average radon concentration is 1210Bq / m3, and the effective annual dose of radon and its daughters to the miners is 7.6mSv. Suggesting that the mine should take measures to increase the ventilation capacity and other measures to reduce the concentration of underground radon; underground miners should be in accordance with the requirements of occupational exposure to carry out occupational health guardianship.