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 A1 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·cm^2/MeV separately, which are consistent with the simulation result of 1.98×10^-20·cm^2/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.
A novel dual-emitter vacuum Compton detector （D-VCD） with higher gamma ray detecting efficiency is proposed. The emitters are made of Ta A1 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·cm^2/MeV separately, which are consistent with the simulation result of 1.98×10^-20·cm^2/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.
