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为对自制的活性面积高达1 000cm~2的大面积源进行表面发射率定值,同时作为现有2πα、2πβ表面发射率标准装置能力的扩充,研制了一套内置式大面积2π多丝正比计数器测量系统,并利用活性区直径为8mm的~(241) Am点源及活性区面积为10cm×15cm的大面积~(241) Am和~(90)Sr-~(90) Y源对其进行计量学性能测试。结果表明:计数器内计数响应均匀性优于±0.4%,有效探测面积达1 400cm~2;所得241 Am源高压坪曲线的坪长为1 400V,坪斜为0.27%/100V,坪区内计数变化为0.87%;90Sr-90 Y源高压坪曲线的坪长为300V,坪斜为0.75%/100V,坪区内计数变化为0.80%;10次测量重复性好于0.4%,8h内短期稳定性好于0.3%,1a内长期稳定性好于0.8%。
In order to evaluate the surface emissivity of self-made large area sources with an active area up to 1 000 cm 2, as an extension of the existing 2πα and 2πβ surface emissivity standard devices, a built-in large-area 2π multi- Counter measurement system, and using the point source of ~ (241) Am with the diameter of 8mm and the large area ~ (241) Am and ~ (90) Sr ~ 90 source with the active area of 10cm × 15cm Perform metrology performance tests. The results show that the counter response uniformity is better than ± 0.4% and effective detection area is 1 400cm ~ 2. The height of 241 Am source high pressure Ping curve is 1 400V and the slope is 0.27% / 100V, The change of the 90Sr-90 Y source high-pressure flat curve is 300V, the slope of the slope is 0.75% / 100V, and the change of the count within the Ping-zhu area is 0.80%. The repeatability of the 10 measurements is better than 0.4% and short-term stability within 8h Sex better than 0.3%, 1a long-term stability better than 0.8%.