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对于穆斯鲍尔吸收速度谱的测量,在小于20keV范围,气体正比计数管是比较理想的探测器。然而目前一般使用的圆筒端窗式正比管能量分辨率较差,且一般的圆筒侧窗式正比管计数灵敏度又较低。为此,我们试制了一种扁平型大铍窗型、有效气体厚度较大的低能γ正比计数管,其内部又作了电场补偿。实验结果表明:它能取得较大的下沉、较高的计数灵敏度、计数本底也较低,
For the Muspel-Bauer absorption rate spectrum measurement, the gas proportional counter tube is an ideal detector in the range of less than 20 keV. However, the energy resolution of the cylindrical end-window proportional tube currently used is poor, and the sensitivity of the general cylindrical side-window proportional tube is lower. To this end, we prototype a large flat beryllium window, a low-energy gamma positive proportional counter tube with a large effective gas thickness, and an electric field compensation inside. Experimental results show that: it can achieve greater sinking, higher counting sensitivity, the counting background is also lower,