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The accelerator-generating 6.13~MeV pulsed Gamma by
19F(p, αγ )160 reaction usually synchronizes
with an intense bremsstrahlung x-ray which has a maximum energy of
1~MeV. This paper proposes a new method, named the scattering and
absorbing method, to diagnose the 6.13~MeV Gamma. This method
includes two parts: the detector and a scatterer placed in front of
the detector. The detector converts the Gamma to electrons and then
collects the electrons by a scintillator. In order to restrain the
interference of the low-energy background, the scintillator collects the
electrons at a small angle. The scintillator is wrapped with
electro-absorbing material to absorb the low-energy electrons
generated by background x-rays. The theoretical sensitivity ratio of
6.13~MeV Gamma to 1~MeV x-rays is greater than 150. The scatterer is a
pretreatment tool to scatter some background x-rays away from the
radial beam before they enter the detector. By varying the length,
the scatterer can reduce the background x-rays to an acceptable level for
the detector. 相似文献
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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. 相似文献
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相对永久密封真空康普顿探测器伽马灵敏度研究 总被引:1,自引:0,他引:1
针对强流脉冲γ射线探测,研制了厚入射窗结构真空康普顿探测器,并在60Co辐照装置上,准直孔径为40 mm的条件下,对2套样品探测器灵敏度进行了测量,得到了1.25 MeV的γ射线灵敏度,实验值分别为4.65×10-22 C/MeV和4.59×10-22 C/MeV.该实验值与蒙特卡罗程序MCNP的计算值(4.70×10-22 C/MeV)相比,误差范围一致,在0.5~3.0 MeV能量区间,探测灵敏度的能量响应变化小于20%.实验证明:该探测器比薄窗结构真空康普顿探测器的灵敏度提高了60%,克服了薄窗探测器封装加工和静态真空保持的困难;保存使用期可达2年以上,达到了相对永久密封的目的,可应用于粒子注量率为1020 cm-2·s-1以上的强流脉冲γ射线测量. 相似文献
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Film ZnO:In crystal is a good candidate for a scintillation recoil proton neutron detection system and the response of ZnO:In to protons is a crucial point. The energy response of ZnO:In to mono-energetic protons in the range of 10 keV-8 MeV was measured. The experiment was carried out in current mode, and Au foil scattering was employed, where the forward scattering protons were used for exciting the sample, and the backward scattering protons were used for monitoring the beam intensity. According to the result, the yield of light non-linearly depends on proton energy, and drops significantly when proton energy is low. The scintillation efficiency as a function of proton energy was obtained, which is very useful for researching the scintillation recoil proton neutron detection system. 相似文献
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This paper describes a newly designed gamma pulse detector of current mode that uses the scattered electron method. Tungsten is used as the scattering target, an organic thin film scintillator ST401 is used to collect the scattered electrons. The spatial distribution of the electronic energy-flux density is studied by using the MCNP code. The optimization of the target and the thickness of the scintillator are also discussed. The results indicate that the energy response is relatively flat in the range of 0.4 to 5 MeV. 相似文献
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