Evaluation of two-stage system for neutron measurement aiming at increase in count rate at Japan Atomic Energy Agency-Fusion Neutronics Source

K Shinohara; K Ishii; K Ochiai; M Baba; A Sukegawa; M Sasao; S Kitajima

doi:10.1063/1.4893941

Evaluation of two-stage system for neutron measurement aiming at increase in count rate at Japan Atomic Energy Agency-Fusion Neutronics Source

Rev Sci Instrum. 2014 Nov;85(11):11E823. doi: 10.1063/1.4893941.

Authors

K Shinohara¹, K Ishii², K Ochiai¹, M Baba³, A Sukegawa¹, M Sasao⁴, S Kitajima²

Affiliations

¹ Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan.
² Department of Quantum Science and Energy Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan.
³ Cyclotron and Radioisotope Center, Tohoku University, Sendai, Miyagi 980-8578, Japan.
⁴ Organization for Research Initiatives and Development, Doshisha University, Kyoto 602-8580, Japan.

PMID: 25430388
DOI: 10.1063/1.4893941

Abstract

In order to increase the count rate capability of a neutron detection system as a whole, we propose a multi-stage neutron detection system. Experiments to test the effectiveness of this concept were carried out on Fusion Neutronics Source. Comparing four configurations of alignment, it was found that the influence of an anterior stage on a posterior stage was negligible for the pulse height distribution. The two-stage system using 25 mm thickness scintillator was about 1.65 times the count rate capability of a single detector system for d-D neutrons and was about 1.8 times the count rate capability for d-T neutrons. The results suggested that the concept of a multi-stage detection system will work in practice.