新建的国内首台反宇宙射线低本底γ谱仪测量装置,结构由内到外分别为HPGe主探测器、内屏蔽室、塑料闪烁反宇宙射线屏蔽探测器和外屏蔽室,采用样品室内充氮气方法进一步降低空气中222Rn子体对谱仪本底的影响。主要技术指标为:HPGe探测器相对效率105.2%;100～2000keV能区积分本底为2.2×10-2s-1/100cm3Ge;100～2000keV能区本底抑制系数为13.7。其中积分本底 The first newly built anti-cosmic ray low background γ spectrometer measuring device, the structure from the inside to the outside were HPGe main detector, inner shielded room, plastic scintillation anti-cosmic ray shielding detector and outer shielded room, The nitrogen method further reduces the influence of 222Rn in the air on the spectrometer background. The main technical indicators are: HPGe detector relative efficiency of 105.2%; 100 ~ 2000keV energy area integral background 2.2 × 10-2s-1 / 100cm3Ge; 100 ~ 2000keV energy region background suppression coefficient of 13.7. The integral background