積算線量計を用いた診療用エックス線量測定における自然放射線の取扱いに関する考察

概要

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At the last amendment of the radiation protection law, dose limits were reduced. The natural radiation dose cannot then be negligible for radiation protection dosimetry at medical facilities. But because the natural radiation dose is not regulated, we should estimate it and subtract it from the measured gross dose. It is difficult to estimate a natural radiation dose precisely because it is affected by many factors. We examined the methods of evaluating a natural radiation dose when an integral dosimeter is applied to environmental radiation dosimetry in medical facilities. Because X-ray energy is low at most medical facilities and we ascertained that a filtered glass dosemeter can effectively separate X-rays and natural radiation. In this method, the total error is less than 30%, which is permissible for radiation protection dosimetry.
日本保健物理学会の論文