Performance evaluation of high-pressure MWPC with individual line readout under Cf-252 neutron irradiation

International Workshop on Neutron Optics and Detectors

Toh, K.^1 ; Nakamura, T.^1 ; Sakasai, K.^1 ; Soyama, K.^1 ; Yamagishi, H.^1,2

J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirakatashirane, Tokyo 319-1195, Japan^1

Nippon Advanced Technology, 3129-45 Hibara, Muramatsu, Tokyo 319-1112, Japan^2

关键词: Experimental facilities;    High spatial resolution;    Irradiation experiments;    Japan proton accelerator research complexes;    Multiwire proportional chamber;    Performance evaluations;    Short response time;    Two dimensional images;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/528/1/012045/pdf
DOI  :  10.1088/1742-6596/528/1/012045

来源: IOP

【 摘 要 】

A multiwire proportional chamber (MWPC) neutron detector system was developed for the Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex. Its basic performance was evaluated by an irradiation experiment using a Cf-252 neutron source. A short response time and high spatial resolution can be obtained using an individual line readout method. The detector system exhibited a one-dimensional uniformity of response of 4.8% and 3.8% in the x- and y-directions, respectively. The uniformity of all pixels in the two-dimensional image was 7.9%. The average intrinsic spatial resolution was 1.55 mm full width at half maximum in the sensitive region calculated by taking into account the track lengths of secondary particles. The signal intensity of the system remained constant during the operation for 500 min under Cf-252 neutron irradiation.