分类： 物理学 >> 核物理学 提交时间： 2024-02-28
Yang yuxuan
Zhang Yue
Zhao Weijuan
Wang Hongwei
Fan Gongtao
Xu Hanghua
Liu Longxiang
Hao Zirui
Li Zhicai
Jin Sheng
Chen Kaijie
Jiao Pu
Zhou Mengdie
Wang Zhenwei
摘要： 上海激光电子伽马源（Shanghai Laser Electron Gamma Source，SLEGS）是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。目前的简易低本底屏蔽使得测量系统本底计数率降低到约 5.2cps/(60 keV-3 MeV 能区）。SLEGS 伽马源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。
分类： 物理学 >> 核物理学 提交时间： 2024-02-16
Yang Yuxuan
Wang Hongwei
Zhao Weijuan
Zhang Yue
Li Zhicai
Hao Zirui
Chen Kaijie
Wang Zhenwei
Sun Qiankun
Fan Gongtao
Xu Hanghua
Liu Longxiang
摘要： The Shanghai Laser Electron Gamma Source(SLEGS) has delivered a quasi-monochromatic, continuously energy-tunable gamma-ray beam. Based on the photon activation analysis(PAA) method, SLEGS has built and developed a photon activation analysis platform, including online activation and offline low-background HPGe detector measurement systems, as an alternative to direct measurement methods and a cross-tests at low throughput. Due to the short half-lives spanning from minutes to days and characteristics such as ease of fabrication, cost-effectiveness, and stability, gold (197Au) and zinc (64Zn) emerge as favorable activation targets in the gamma-ray beam flux monitor. Notably, their utility shows a multitude of advantages in monitoring the gamma-ray beam flux typically 105 photons/s with the energy of 13.16 to 19.08 MeV under the condition of the 3 mm coarse collimator. Especially in high-flux $\gamma$-ray beam experiments can be well applied.
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