A high-energy gamma-ray source based on neutron capture

被引：5

作者：

Mao, Xiaoqing ^{[1
,2
]}

Wang, Zhonghai ^{[1
]}

Qi, Junfeng ^{[1
,2
]}

Chen, Qi ^{[1
,2
]}

Qi, Peiwen ^{[1
,2
]}

Li, Xiaobing ^{[1
,2
]}

Zhao, Chaoyang ^{[1
,2
]}

Li, Yulong ^{[1
,2
]}

Zhu, Balin ^{[1
,2
]}

Gao, Tai ^{[1
,2
]}

Zhou, Rong ^{[1
,2
]}

Yang, Chaowen ^{[1
,2
]}

机构：

[1] Sichuan Univ, Coll Phys, Chengdu 610065, Peoples R China

[2] Sichuan Univ, Minist Educ, Key Lab Radiat Phys & Technol, Chengdu 610065, Peoples R China

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2020年 / 982卷

基金：

中国国家自然科学基金;

关键词：

Neutron-capture gamma-ray source; High-energy gamma ray; GEANT4; DETECTOR;

D O I：

10.1016/j.nima.2020.164552

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

In special applications, high-energy gamma rays are needed to calibrate the energy response of a detector. However, the energies of commonly used radioactive gamma-ray sources are lower than 3 MeV. An alternative source is the prompt gamma rays created by the radiative capture of thermal neutrons. In this study, a 5x10(4) neutrons/s Am-Be neutron source was used to emit fast neutrons that were moderated in paraffin and then absorbed by Ni (nickel), which captured thermal neutrons and generated monochromatic high-energy gamma rays in the range 5-9 MeV. The 8.99 MeV line in this was the strongest. The paraffin and Ni were mixed uniformly to increase the yield of the high-energy gamma rays, and the optimal mass ratio of paraffin to Ni was calculated by GEANT4. According to the results of simulations, a 200x200x200 mm(3) neutron-capturing device was built with a mass ratio of paraffin to Ni of 3:7. Finally, spectra of the high-energy gamma rays emitted by the device were measured by a 38.1 mm (diameter) x 38.1 mm (thickness) LaBr3:Ce detector, and most characteristic energy peaks were clearly visible.

引用

页数：6

共 16 条

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