Development and characterization of a neutron personal dose equivalent monitor

Tsujimura, Norio   ; Yoshida, Tadayoshi ; Nunomiya, Tomoya*; Aoyama, Kei*

The authors developed a new neutron-measuring instrument that was designed to measure a neutron personal dose equivalent, H(10). This instrument is composed of a conventional moderator-based neutron dose equivalent meter and a neutron shield made of borated polyethylene which covers a backward hemisphere to adjust the angular dependence. The whole design was determined on the basis of MCNP calculations so as to have response characteristics which would generally match both energy and angular dependencies of H(10). The verification experiments for energy and angular responses were done using monoenergetic neutrons produced by the accelerator and polyenergetic neutrons from the moderated Cf source. As results of experiments, it is found that this new instrument has reasonably acceptable responses as a reference neutron dosemeter.