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Abstract Because of the collapse column, fault and other structural damage to the complete formation, radioactive material radonwith the structure damage brought up to the surface, forming a radioactive elements of radon content difference of abnormal “halo”, using the α numeric scintillation radiometer to measure the strength of the radioactive, within the scope of the detecting circle “abnormal” area, which had important significance to detect concealed structures in coal mine. α measurement in soil was one of the natural radioactive detection method, had the advantages of safety, small radioactive, no pollution, was important for its applications.
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