现代反符合（AC）系统在 HPGe γ-能谱法中降低空气滤器中放射性核素探测下限的应用。
Application of modern anticoincidence (AC) system in HPGe γ-spectrometry for the detection limit lowering of the radionuclides in air filters.
机构信息
Technical University of Lodz, Institute of Applied Radiation Chemistry, Wróblewskiego 15, 90-924 Lodz, Poland.
出版信息
J Environ Radioact. 2017 Apr;169-170:104-108. doi: 10.1016/j.jenvrad.2017.01.008. Epub 2017 Jan 19.
The use of active and passive shields can substantially reduce the Minimum Detectable Activity (MDA) of the γ-ray counting systems, rejecting events induced by cosmic-rays or by environmental radioactivity. However, the size and geometry of the samples lead to limitations in the background reduction in routine measurements. The Minimum Detectable Activity (MDA) values for low energy of γ-ray emitting radionuclides (<200 keV) deposited in three typical air filter geometries have been compared for anticoincidence and single HPGe detector mode of γ-spectrometry systems. The relative increase in the Figure Of Merit (FOM) values from to 10-37% has been achieved for AC counting mode for radionuclides of Pb, Th, U and Ra deposited on the three kinds of air filters.
主动和被动屏蔽可以大大降低γ射线计数系统的最小可探测活度（MDA），从而排除由宇宙射线或环境放射性引起的事件。然而，样品的尺寸和形状导致在常规测量中背景减少存在限制。对比了反符合和单 HPGe 探测器模式的 γ 能谱系统，比较了沉积在三种典型空气滤膜几何形状中的低能γ射线发射放射性核素（<200keV）的最小可探测活度（MDA）值。对于沉积在三种空气滤膜上的 Pb、Th、U 和 Ra 放射性核素，AC 计数模式的品质因数（FOM）值相对增加了 10-37%。
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