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Report No.
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Characterization measurement of JRR-4 utilization facility

Kishi, Toshiaki ; Motohashi, Jun ; Yamamoto, Kazuyoshi ; Kumada, Hiroaki; Torii, Yoshiya 

JRR-4 had carried out modification works for the purpose of reducing the enrichment level of fuel. About utilization facilities, followings were installed new neutron beam facility, renewal irradiation facility that was modified pneumatic irradiation facility for activation analysis of short-lived nuclides. This report describes the characteristic measurement by initial core and equilibrium core in 2001 by renewal JRR-4. Utilization facilities had been identified equal performance before modify about neutron flux and cadmium ratio on 1998 and 2001. And we have achieved less than 5% of irradiation uniformity at N-pipe. The maximum neutron flux is about 2.2$$times$$10$$^{13}$$m$$^{-2}$$$$cdot$$s$$^{-1}$$ at the New neutron beam facility and the maximum neutron flux is about 1$$times$$10$$^{11}$$m$$^{-2}$$$$cdot$$s$$^{-1}$$ at the prompt $$gamma$$-ray analysis facility got good quality performance for medical irradiation and fundamental examination of it.

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