Investigation and evaluation of radioactive level in coal mines in a county of Xinjiang

In order to strengthen the radioactivity supervision of coal mining process in a county in Xinjiang, 4 coal mines' γ radiation dose rate, radon concentrations and naturally occurring radionuclides of solid samples were investigated and measured, the annual effective dose of the coal mine staff were estimated. The monitoring results showed that: the γ radiation dose rate and radon concentration level of the coal mine ground environment were at the level of Xinjiang and the national environment background; the γ radiation dose rate and radon concentration level of the coal mine underground environment were higher, the numerical fluctuation were great, and anomaly radioactivity existed in part of coal mines; the annual effective dose of the coal mine staff were: A mine 1.38 mSv, B mine 0.69 mSv, C mine 0.08 mSv, D mine 0.61 mSv. The evaluation results showed that the regional 4 coal mines had radioactive problems, and the radiation safety supervision work of the mines should be strengthened. (authors)