Evaluation of neutron response of criticality accident alarm system detector to quasi-monoenergetic 24 keV neutrons

24keV準単色中性子に対する臨界事故警報装置用検出器のレスポンスの評価

辻村 憲雄   ; 吉田 忠義 ; 八島 浩*

Tsujimura, Norio; Yoshida, Tadayoshi; Yashima, Hiroshi*

The criticality accident alarm system (CAAS), recently developed and installed at the Tokai Reprocessing Plant of the Japan Atomic Energy Agency, consists of a plastic scintillator combined with a cadmium-lined polyethylene moderator and thereby responds both to neutrons and rays. To evaluate the neutron absorbed dose rate response of the CAAS detector, a 24 keV quasi-monoenergetic neutron irradiation experiment was performed at the B-1 facility of Kyoto University Research Reactor. The evaluated neutron response of the detector was confirmed to be in reasonably good agreement with the prior computer-predicted response.