Estimation of genetically significant dose equivalent from occupational exposure to external sources of radiation in Japan

The genetically significant dose equivalent from occupational exposure in Japan has been estimated. The annual individual dose from external X-ray, gamma-ray and neutron sources in various types of radiation work has been evaluated from the personnel monitoring records. This report also presents information on the numbers of installations and radiation workers in Japan. The mean annual dose equivalent in medical, industrial, research and educational, and atomic work was 377, 291, 88.6 and 125 mrem per yr, respectively. The genetically significant dose equivalent in medical, industrial, research and educational, and atomic energy work was 0.082, 0.032, 0.0053 and 0.0056 mrem per yr, respectively.