2011 Article Dosimetry ICNCT14 Physics

Evaluation for activities of component of Cyclotron-Based Epithermal Neutron Source (C-BENS) and the surface of concrete wall in irradiation room

Applied Radiation and Isotopes, 2011

Authors:   M. Imoto,H. Tanaka,K. Fujita,T. Mitsumoto,K. Ono,A. Maruhashi,Y. Sakurai,
Journal: Applied Radiation and Isotopes
Abstract: The workers employed in BNCT must enter the irradiation room just after an irradiation under the condition of remaining activities. To reduce the radiation exposure for the workers, it is important to identify the origins of the activities. In this research, the activities induced on the concrete wall surface were evaluated using MCNP-5 and the measurement results of thermal neutron distribution. Furthermore, the radioisotopes produced in the moderator were identified with a High Purity Germanium detector. It was found that the activities of the wall were mainly caused by 46Sc, 60Co and 152Eu, and that 24Na and 56Mn were mainly produced in the moderator.