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Report No.

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

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 $$gamma$$ 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.



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