中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4777-4780.doi: 10.1088/1674-1056/18/11/028

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Design and gamma sensitivity measurement of a novel dual-emitter vacuum Compton detector

王群书1, 夏良斌1, 管兴胤1, 张子川1, 韩和同2   

  1. (1)Northwest Institute of Nuclear Technology, Xi'an 710024, China; (2)School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;Northwest Institute of Nuclear Technology, Xi'an 710024, China
  • 收稿日期:2009-01-22 修回日期:2009-04-22 出版日期:2009-11-20 发布日期:2009-11-20

Design and gamma sensitivity measurement of a novel dual-emitter vacuum Compton detector

Han He-Tong(韩和同)a)b), Wang Qun-Shu(王群书)b), Xia Liang-Bin(夏良斌)b), Guan Xing-Yin(管兴胤)b), and Zhang Zi-Chuan(张子川)b)   

  1. a School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China; b Northwest Institute of Nuclear Technology, Xi'an 710024, China
  • Received:2009-01-22 Revised:2009-04-22 Online:2009-11-20 Published:2009-11-20

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摘要： A novel dual-emitter vacuum Compton detector (D-VCD) with higher gamma ray detecting efficiency is proposed. The emitters are made of Ta--Al clad metal. The gamma ray sensitivity is studied by Monte Carlo simulation using the MCNP code. A comparison between calculations and results measured by using the 1.25~MeV gamma ray of Co-60 is also performed. Experimental sensitivities for two sample D-VCDs with the same materials and structures are 1.92×10^ - 20 and 2.02×10^ - 20~C.cm2/MeV separately, which are consistent with the simulation result of 1.98×10^ - 20~C.cm2/MeV and are 4 times higher than that of VCD with a single Fe emitter. According to the simulation results, in a gamma energy range from 0.5 to 3~MeV, the maximum sensitivity variance for the D-VCD is less than 15%, and less than 5% in a range from 1 to 2~MeV in particular. The novel D-VCD is applicable to the detection of intense pulse gamma rays.

Abstract: A novel dual-emitter vacuum Compton detector (D-VCD) with higher gamma ray detecting efficiency is proposed. The emitters are made of Ta--Al clad metal. The gamma ray sensitivity is studied by Monte Carlo simulation using the MCNP code. A comparison between calculations and results measured by using the 1.25~MeV gamma ray of Co-60 is also performed. Experimental sensitivities for two sample D-VCDs with the same materials and structures are $1.92×10^{-20}$ and $2.02×10^{-20}$ C$\cdot$cm2/MeV separately, which are consistent with the simulation result of $1.98×10^{-20}$ C$\cdot$cm2/MeV and are 4 times higher than that of VCD with a single Fe emitter. According to the simulation results, in a gamma energy range from 0.5 to 3 MeV, the maximum sensitivity variance for the D-VCD is less than 15%, and less than 5% in a range from 1 to 2 MeV in particular. The novel D-VCD is applicable to the detection of intense pulse gamma rays.

Key words: vacuum Compton detector, sensitivity, pulsed gamma ray

中图分类号:  (X- and γ-ray sources, mirrors, gratings, and detectors)

  • 07.85.Fv
29.40.Mc (Scintillation detectors) 29.40.Cs (Gas-filled counters: ionization chambers, proportional, and avalanche counters)