A 4H silicon carbide based fast-Neutron detection system with a neutron threshold of 0.4 MeV

作者：Liu, L. Y.^*; Ouyang, X. P.^*; Zhang, X. P.; Liu, J. L.; Ruan, J. L.; Jin, P.; Tian, Z. N.; Su, C. L.; Huang, R. H.; Bai, S.

来源：Sensors and Actuators A: Physical , 2017, 267: 547-551.

DOI：10.1016/j.sna.2017.10.009

• 4H-SiC
• Fast-neutron
• Np-237
• Fission fragment
• Radiation resistance

Special requirements in pulsed fast-neutron detection of prompt fission and fusion devices call for a detection detector or system which could detect fast-neutrons in a severe radiation field, and thus should necessarily have a flat energy response, a high signal-noise-ratio, proper threshold energy, and a good radiation resistance. In this paper, a fast-neutron detection system based on a thin silicon carbide (SiC) detector and a Np-237 fission target was developed and tested on Xi'an Pulsed Reactor, which was with a neutron threshold of 0.4 MeV, a flat energy response to neutrons in the range of 1 MeV to 20 MeV and got good response spectra to fission fragments. The SiC detector used here is a 4H-SiC Schottky diode detector with the dimension of 20 mm x 20 mm x 201.1m, a dark current of lower than 5 nA within 600 V, a best energy resolution to alpha particles of about 1.78% and a high radiation resistance under alpha particle irradiation with a max incident number of 1.03 x 10(10). The detection system shows advantaged prospects in fast-neutron fluence monitoring in nuclear fission and fusion equipments.

• 出版日期2017-11-1
• 单位西京学院; 西北核技术研究所; 西安交通大学