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)
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
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.
Received: 22 January 2009
Revised: 22 April 2009
Accepted manuscript online:
PACS:
07.85.Fv
(X- and γ-ray sources, mirrors, gratings, and detectors)
(Gas-filled counters: ionization chambers, proportional, and avalanche counters)
Cite this article:
Han He-Tong(韩和同), Wang Qun-Shu(王群书), Xia Liang-Bin(夏良斌), Guan Xing-Yin(管兴胤), and Zhang Zi-Chuan(张子川) Design and gamma sensitivity measurement of a novel dual-emitter vacuum Compton detector 2009 Chin. Phys. B 18 4777
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