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Report No.

Developments of a LaBr$$_3$$ scintillation detector system for neutron resonance densitometry (NRD)

Koizumi, Mitsuo ; Tsuchiya, Harufumi; Kitatani, Fumito ; Harada, Hideo  ; Takamine, Jun ; Kureta, Masatoshi ; Seya, Michio; Kimura, Atsushi  ; Iimura, Hideki ; Becker, B.*; Kopecky, S.*; Mondelaers, W.*; Schillebeeckx, P.*

Neutron resonance densitometry (NRD) has been proposed as a method to quantify the amount of special nuclear materials in particle-like debris of melted fuel. The requirements of a $$gamma$$-ray detector system for the NRD measurements are: (1) good energy resolution to identify elements (2) fast response not to be suffocated by the radiation from debris samples and (3) good signal to noise ratio. The quantification of $$^{10}$$B is considered to be the most important for NRD because of its very large neutron cross-sections. However, the Compton peak of the $$gamma$$ rays from $$^{137}$$Cs, which is probably the strongest radioactivity in debris, overlaps the $$^{10}$$B $$gamma$$ peak; and it makes the measurements difficult. We, therefore, designed a well-type LaBr$$_{3}$$ scintillation spectrometer to reduce the Compton peak. The progress of the research and development of the spectrometer is reported.



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