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本文介绍了阴极面积为300cm~2的流气式平行板α屏栅电离室的结构和性能。电离室工作气体为 P-10(90%Ar+10%CH_4)气体,充气压约1.8×10~5Pa。在流气量小于25mL/min 时可连续工作48h。该装置的主要性能是:能量分辨率为36keV(对φ<10mm的~(239)Pu 电沉积源),4—6MeV 能区本底为12.6cph,最小可探测活度为2×10~(-4)Bq(按本底计数率标准差的3倍及27小时测量时间估计),探测效率为44%(对φ=190mm 大面积~(232)Th 源)。
This paper presents the structure and performance of a flow-grid parallel plate α-screen ionization chamber with a cathode area of 300cm ~ 2. Ionization chamber working gas P-10 (90% Ar + 10% CH_4) gas, inflation pressure of about 1.8 × 10 ~ 5Pa. In the flow of less than 25mL / min can work continuously for 48h. The main features of the device are: 36 keV (~ (239) Pu Electrodeposition source for φ <10 mm), a 4-6 MeV energy region background of 12.6 cph and a minimum detectable activity of 2 × 10 ~ ( -4) Bq (estimated at 3 times the standard deviation of the background count rate and a 27-hour measurement time) with a detection efficiency of 44% (~ 232 Th source for φ = 190 mm).