上海激光电子伽马源的伽马活化实验平台建设

杨宇萱; 张岳; 赵维娟; 王宏伟; 范功涛; 许杭华; 刘龙祥; 郝子锐; 李志才; 金晟; 陈开杰; 焦普; 周梦蝶; 王振伟

doi:10.11804/NuclPhysRev.41.2023CNPC42

上海激光电子伽马源的伽马活化实验平台建设

Construction of Gamma Activation Experimental Platform for Shanghai Laser Electron Gamma Source

摘要

摘要: 上海激光电子伽马源(Shanghai Laser Electron Gamma Source, SLEGS)通过激光与电子逆康普顿散射产生准单能、能量连续可调的兆电子伏伽马束，是目前国际上唯一一台可连续变换碰撞角度的激光康普顿散射(Laser Compton Scattering, LCS)伽马源装置。伽马活化是研究材料特性的有效手段之一，本文介绍了上海激光电子伽马源的伽马活化平台情况：包括在线活化过程、离线低本底测量、高纯锗(High Purity Germanium, HPGe)探测器的能量效率刻度等。目前的低本底屏蔽使得测量系统本底计数率降低到约5.2 cps(60 keV~3 MeV能区)。SLEGS的活化平台为开展伽马活化测量研究提供了有利条件，未来在核物理、核天体物理、医学应用、材料科学和环境科学等领域的研究将会发挥重要的作用。

Abstract: Shanghai Laser Electron Gamma Source (SLEGS) is a quasi-monoenergetic, and energy-tunable MeV gamma-rays source generated by the inverse Laser Compton Scattering (LCS) of lasers and electrons. SLEGS is the only LCS gamma source in the world with a continuously variable collision angular range. The gamma activation analysis is one of the effective methods to study the properties of materials. This paper introduces the gamma activation platform of SLEGS, including the online activation experiment, the low background offline measurement, and the energy and efficiency calibration for the high purity germanium (HPGe) detector. The counting rate of the shielded HPGe has been controlled down to 5.2 cps/s within 60 keV~3 MeV region under the current low background environment. The activation platform of the SLEGS has provided favorable conditions for gamma activation measurements, which will play an important role in future research in the fields of nuclear physics, nuclear astrophysics, medical applications, materials science, and environmental science.

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