高级检索

有效探测面积大于1000 cm2的正比计数器测量系统性能测试

Test of Proportional Counter System with Effective Detective Area Larger than 1000 cm2

    摘要
  • 摘要: 为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，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8 mm的241Am点源及活性区面积为10 cm×15 cm的大面积241Am和90Sr-90Y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1 400 cm2；所得241Am源高压坪曲线的坪长为1 400 V，坪斜为0.27%/100 V，坪区内计数变化为0.87%；90Sr-90Y源高压坪曲线的坪长为300 V，坪斜为0.75%/100 V，坪区内计数变化为0.80%；10次测量重复性好于0.4%，8 h内短期稳定性好于0.3%，1 a内长期稳定性好于0.8%。

     

    Abstract: In order to determine the emission rate of the large-area source whose active area is up to 1 000 cm2, and to expend current standard ability of 2πα, 2πβ emission rate, a suit of large-area 2π multi-wire proportional counter system was established. The test about the characteristics of the whole system was carried out using both point source with active diameter of 8 mm and large-area source with active size of 10 cm×15 cm in this paper. The results show that the effective detective area is about 1 400 cm2 with homogeneity of counts of better than ±0.4%. The high-voltage plateau of 241Am source is about 1 400 V with a slope of 0.27%/100 V and variation coefficient of 0.87%, while the high-voltage plateau of 90Sr-90Y source is about 300 V with a slope of 0.75%/100 V and variation coefficient of 0.80%. The repeatability of 10 measurements is better than 0.4%. Short term stability within 8 h is better than 0.3%, while long term stability within one year is better than 0.8%.

     

    • HTML全文
    • 参考文献(4)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回