Development of NRD, 1; Developments of a LaBr scintillation detector system for neutron resonance densitometry

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.*

We have proposed neutron resonance densitometry (NRD) as a method to quantify special nuclear materials in particle-like debris of melted fuel. NRD is a combination of neutron resonance transmission analysis (NRTA), and neutron resonance capture analysis (NRCA) (and prompt -ray analysis (PGA)). NRCA/PGA is used to identify contaminant elements, which is difficult to be detected by NRTA. To observe rays emitted in neutron capture reaction, a spectrometer consisting of LaBr scintillation detectors has been constructed. A newly installed data acquisition system enables us to measure 500 k event/s for each 8-channel inputs. In this presentation, the research and development of NRD is introduced and the status of the development of the spectrometer system is given as well.