Neutron dose rate in the facility at the Cyclotron Center of Chung Shan Medical University

摘要

The neutron dose equivalent rate (DR) leaking from the self-shielded cyclotron was measured using an FHT-751 neutron counting system in the facility at the Cyclotron Center of Chung Shan Medical University. This system was calibrated using two Cf-252 neutron sources and simulated according to MCNP code. The results show various DRs up to 120 mu Sv h(-1) in the cyclotron room. Two-dimensional distributions of measured neutron DRs indicate an explicit, heavy leakage of neutrons through the self-shielded interlock. The neutron DR of the operating cyclotron that is hazardous to the health of medical personal and the public is evaluated.