Design and gamma sensitivity measurement of a novel dual-emitter vacuum Compton detector |
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Authors: | Han He-Tong Wang Qun-Shu Xia Liang-Bin Guan Xing-Yin and Zhang Zi-Chuan |
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Institution: | School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China; Northwest Institute of Nuclear Technology, Xi'an 710024, China |
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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.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. |
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Keywords: | vacuum Compton detector sensitivity pulsed gamma ray |
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