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为了对自制的活性面积高达1 000 cm2的大面积源进行表面发射率定值,自行研建了一套无窗式大面积2π多丝正比计数器测量系统。利用活性区直径为8 mm的241Am点源以及活性区面积为10 cm×15 cm的大面积241Am和90Sr-90Y源对其进行了计量学性能测试,测试结果分别示于图1和图2。结果表明,计数器内电场不均匀性好于±0.4%,有效探测面积可达约1 400 cm2;所得241Am源高压坪曲线坪长为1 400 V,坪斜为0.27%/100 V,坪区内计数率变化为0.87%;90Sr-90Y源坪曲
In order to set the surface emissivity of self-made large area source with the active area up to 1 000 cm2, a set of window-free large-area 2π multi-wire proportional counter measurement system was developed. The metrological properties of 241Am source with a diameter of 8 mm and large area 241Am and 90Sr-90Y with active area of 10 cm × 15 cm were measured. The results are shown in Fig. 1 and Fig. 2, respectively. The results show that the in-counter electric field inhomogeneity is better than ± 0.4% and the effective detection area is up to about 1 400 cm2. The obtained 241Am source-high voltage flat curve length is 1 400 V and the slope is 0.27% / 100 V. The count rate changes to 0.87%; 90Sr-90Y source Ping song