Annual report of the activities of health physics in JAERI in 1999. April 1, 1999 - March 31, 2000

This annual report summarizes the activities in fiscal year 1999 concerned with radiation protection which cover environmental monitoring of the facilities, radiation protection of workplace and workers, individual monitoring, maintenance of monitoring instruments, and their technical development, carried out at the establishments of Tokai, Naka, Takasaki, Oarai, Kansai and Mutsu of JAERI. The report also covers the research activities of 4 research laboratories for Radiation Risk Analysis, Internal Dosimetry, External Dosimetry and Calibration Standards and Measurement which were authorized in Department of Health Physics in Tokai Establishment in April 1999. There are no occupational exposure and effluent release recorded exceeding the prescribed limits for effective dose equivalent and radioactive concentrations for gaseous release and liquid waste. In September 30 in 1999, the JCO criticality accident occurred in Tokai village and the Department of Health Physics of Tokai Establishment, Radiation Protection Division of Oarai Establishment and Safety Division of Naka Establishment took cooperative activities for surveying the level of radiation and radioactivity in the environment, radiation protection in terminating the criticality, sending specialists for the consultant of radiation protection to local government and others, surveying the radioactive contamination of the evacuated public, play ground of schools and others. The estimations of dose for the public and total fissions from the measurement of neutron activated samples collected near JCO were carried out at External Dosimetry Laboratory and Calibration Standards and Measurement Division respectively in Department of Health Physics of Tokai Establishment. (author)