Study On The Dose Of The Underground Coal Mine Workers In A Certain Area Of Xinjinag

Select six coal mines in Xinjiang key coal Mining District. Radon concentration and γ radiation dose rate of six coal mines were detected in Xinjiang area. Gangue radionuclide concentration of the coal mine were analyzed for each coal mine. Then, considering annual effective inhalation of dust caused by Radon and radon progeny, γ radiation, we should build underground workers estimated radiation dose pattern. Estimate the dose of the underground mine staff,master the general level of the occupational exposure dose in the area of Xinjiang, and compare with the radiation level of the underground workers in China.Survey and monitoring results show that the presence of some coal mines have unusual radioactivity problems. Most coal mines radiation levels below the national average, and the radiation level of large coal mines is higher than medium and small coal mines. The γ radiation dose rate is too high in A coal mine, average value of up to 241.4×10-8Gy/h, The γ radiation dose rate of the other large, medium and small coal mines are in the range of 1×10-8~25×10-8Gy/h,the concentration of radon in large, medium and small coal mines is concentrated in 140、50、60 Bq/m3. We also find that A coal mine coal has high levels of radionuclides and B coal mine Radon concentration is high, and the content of coal gangue is high. The tailings dam was built to carry out the treatment of coal gangue, In addition to the A coal mine; the concentration of radionuclides in the rest of coal mine was low.The average annual effective dose of the six coal mines is 1.47 m Sv, and the annual effective dose of the A coal mine underground workers is 4.23 m Sv, which is far beyond the national average of 2.4m Sv. The remaining five coal mines are lower than the national average of 2.4m Sv, which shows that most of the area of Xinjiang coal mine underground workers annual dose is low. The annual effective dose is relatively high in six coal mines of large coal mines, however, the annual effective dose is relatively small for medium and small coal mines. Removing A coal mine from the rest of the coal mine, the annual effective dose caused by radon and radon progeny accounts for 70%-90% of the total annual effective dose of the underground workers. Similar to the majority of coal mines in the country, Radon and radon progeny are the most important underground radiation hazards. The annual effective dose of γ radiation is also low. Each coal mine the annual dose caused by the inhalation of dust is relatively small, which is about 0.01~0.19 m Sv. The average annual effective dose of each monitoring point of underground mining and roadway position caused by radiation level is higher than that of the basic annual effective dose. The radiation level of the mining face and the main tunnel is the highest, and the radiation hazard to the human body is relatively large.Finally we need to take a series of protective measures and strengthen the supervision of Xinjiang coal mine: coal mine itself needs to strengthen supervision; Adopt various measures to reduce the radiation level of underground mine; Strengthen workers’ awareness of self-protection; Build underground professionals dose of archives; Establish and improve relevant laws and regulations; Clear the relevant responsibilities of the department.