Present status of ambient dose equivalent rate and radioactive substance concentration measurements in working environment. 2. Present status of measurement methods and practical examples

According to Law on Industrial Safety and Hygiene, the rules of working environment measurement expert, measurement of radiation and radioactivity in working environment and ambient dose equivalent at 10 mm in hospitals and facilities are explained. Outline of measurement process in working environment is described. On measurement of airborne radioactive substance concentration, design, sampling methods, measurements and analyses, items in the report, and practical measurement results of universities are described. On the ambient dose equivalent at 10 mm, determination of measurement points in preparation room, treatment room, boundary area, boundary of facilities, living environment and Liniac used as irradiation equipment is stated. The results of measurements are evaluated. The leakage dose is calculated. 19 points of measurements in 883 points of nuclear medicine facilities and 21 in 644 points of the hospitals showed the significant quantities. (S.Y.)