请翻译成英文：低本底γ能谱活度标准装置包括反康普顿低本底γ谱仪和反宇宙射线低本底γ谱仪主要用于超低水平γ放射性样品的核素分析和活度测量。国内首台反宇宙射线低本底γ谱仪采用物质屏蔽、反符合塑料闪烁探测器和热中子屏蔽等联合方法大幅度降低了实验室环境和宇宙射线产生的本底有效抑制了快中子与锗晶体和屏蔽材料非弹性散射引起的本底极大地拓展了低本底γ谱仪的探测下限达到了国际同类地面谱仪的最高水平荣获国防科技进步

The low-background gamma energy spectrum activity standard device consists of an anti-Compton low-background gamma spectrometer and an anti-cosmic ray low-background gamma spectrometer. It is mainly used for isotope analysis and activity measurement of ultra-low-level gamma radioactive samples. The first anti-cosmic ray low-background gamma spectrometer in China adopts combined methods such as material shielding, anti-coincidence (plastic scintillation detector), and thermal neutron shielding, which significantly reduces the background generated by the laboratory environment and cosmic rays. It effectively suppresses the background caused by fast neutrons' non-elastic scattering with germanium crystals and shielding materials, greatly expanding the detection limit of the low-background gamma spectrometer, reaching the highest level of international similar ground spectrometers, and winning the second prize of national defense scientific and technological progress. The main technical indicators are: high-purity germanium detector relative detection efficiency of 105%, 50keV to 2000keV integral background of 0.1s-1. It plays an important role in basic scientific research, nuclear fuel cycle, nuclear facility operation monitoring, environmental protection, and has participated in IAEA-related capability verification activities with a data pass rate of 100%