便携式α-β-γ谱仪设计

Design of portable α - β - γ spectrometer

摘要:

现有便携式谱仪无法同时对α-β-γ射线进行测量，使得相关人员对α-β-γ混合场景的评估与处理存在不便，因此研制了一套便携式α-β-γ谱仪以解决上述问题. 谱仪采用PIPS探测器和LaBr3(Ce)探测器分别对α-β粒子和γ射线进行测量，获取高分辨的能谱. 经测试，谱仪的α能量分辨率小于140 keV (5.486 MeV，0.1 atm)，α表面发射率响应67.34% (241Am)，β表面发射率响应19.13% (90Sr-90Y)，γ能量分辨率小于3.4% (662 keV). 因此谱仪可同时测量α-β-γ射线并获取高分辨的能谱，有助于相关人员对测量现场做出快速准确的评估与处理.

Abstract:

The existing portable spectrometer cannot measure the α-β-γ ray at the same time, which makes the evaluation and processing of the α-β-γ mixed scene inconvenient, so a portable α-β-γ spectrometer is developed to solve the problem. The spectrometer uses a PIPS detector and a LaBr3(Ce) detector to measure α-β particles and γ-rays, respectively, to obtain a high-resolution energy spectrum. The main properties of the spectrometer such as α energy resolution, α/β surface emissivity response, γ energy resolution and temperature stability were tested. The α energy resolution is less than 140 keV (5.486 meV, 0.1 atm), surface emissivity response of α particles is 67.34% (241Am), surface emissivity response of β particles is 19.13%(90Sr-90Y), and γ energy resolution is less than 3.4% (662 keV). Therefore, the spectrometer can simultaneously measure the α-β-γ rays and obtain the high resolution energy spectrum, which is helpful for the related personnel to make rapid and accurate evaluation and treatment of the measurement site.