REDUCTION OF GAMMA RADIATION LEVEL OF MINERS IN PURIFYING FACE BLOCKS AS THE DOMINANT FACTOR IN IMPROVING THE RADIATION SITUATION AT THE URANIUM MINES OF RUSSIA
The experience of supporting radiation safety of miners in purifying face blocks of uranium mines of «PIMCU» is given. The results of the analysis of the radiation situation have shown that mining faces with uranium content of more than 0,5 % of miners in purifying face blocks receive the dose up to 110 mSv over the successive 5 years, which is 10 % higher than the limit set by NRB-99. Reducing the dose to 2 mSv per year due to the use of shielding protection against --irradiation on powerloaders will solve the problem and avoid overexposure of the staff of purifying face teams during the year for other jobs. The analysis of mining bodies with different types of power-loaders is given. On the basis of production tests the reduction of the dose of external --irradiation of miners in purifying face blocks of uranium mines is proved on the basis of the screening system use of operator’s seat in power-loaders. The formula for calculating the radiation dose in mines, depending on the uranium content in the ore body is suggested. It is proved that the use of lead shielding system of operator’s seat in power-loaders can effectively fulfill ore bodies with high uranium content.