Performance test of the electronic personal neutron dosemeter in neutron fields simulating workplaces of MOX fuel fabrication facilities

MOX燃料製造施設の作業場を模擬する中性子場における電子式中性子個人線量計の性能評価

辻村 憲雄   ; 吉田 忠義 ; 高田 千恵 ; 布宮 智也*; 青山 敬*

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

二個のシリコン半導体検出器からなる電子式中性子個人線量計の性能評価試験を実施した。試験は、Cf中性子線源と減速材を組合せて作成した減速中性子校正場で行われた。その結果、個人線量計による中性子線量当量の指示精度は-30%+10%であることがわかった。

The authors assessed performance of electronic personal neutron dosemeters (EPD). The EPD selected in this study is NRY21, manufactured by Fuji Electric Systems Co., Ltd. This dosemeter uses two silicon semiconductor detectors to provide wide measurable energy ranges from thermal to several tens of MeV. In the test, we focused on the energy and angular dependences of dose equivalent responses because it was of great importance in neutron dosimetry in work environments. Measurements of dose equivalent responses were performed in the moderated neutron field reproducing neutron spectra likely to be encountered in workplaces of MOX fuel facilities. Neutron dose equivalents given by EPD were compared with reference dose values. As a result, dose equivalent responses of this EPD were evaluated to be 0.7 to 1.1 for normal incidence of neutron irradiation. This is satisfactory performance required for personal neutron monitoring.