Evaluation of dose conversion coefficients for high-energy radiation in Japan after Satif-4

After SATIF-4, four activities of dose conversion coefficient evaluation for high-energy radiations were achieved by using an anthropomorphic model in Japan. The first was the evaluation of effective dose and ambient dose equivalent conversion coefficients for high-energy photon and the evaluation of dose contribution due to photonuclear reactions from high-energy photons. The second was the evaluation of effective dose for high-energy electrons. The third was the evaluation of effective dose and effective dose equivalents for high-energy alpha particles. The fourth was the trial evaluation for neutrons and protons up to 100 GeV. The data of fluence to effective dose conversion coefficients for high-energy photons and electrons obtained using the EGS4 code were almost same as those evaluated by the FLUKA code system. On the other band, the data for 10-100 GeV neutrons and protons obtained using the HERMES code system were smaller than those evaluated by the FLUKA code system for all irradiation geometries, and the difference was caused by the nuclear reaction model. (authors)