Induced Radioactivity at High-energy Irradiation Terminal of HIAF

The Monte Carlo code FLUKA was used to predict the induced radioactivity of high-energy irradiation terminal of HIAF. The maximum energy of proton is 9.3 GeV, and the maximum current is 1.45×10¹² pps (particle per second). In this study we were to predict:(1) the activity properties of activated substances in the experimental terminal; (2) the residual dose rate distribution in the experimental terminal at different cooling time. The results indicate that the induced radioactivity in the high energy irradiation terminal of the HIAF is mainly affected by the radionuclide induced in the beam dump. The residual dose rate on the surface of the beam dump is 2.375 mSv·h^-1, after 100 d irradiation and 4 h cooling. The dynamic saturation ratio of ¹³N and ¹⁵O induced in the air inside the terminal is higher than its corresponding derived air concentration. The activity of 13 N and¹⁵O induced in cooling water is higher than its ALI_min. This study is a part of radiation protection basic research and environmental impact assessment for HIAF.