基于内充气正比计数器长度补偿法测量<sup>85</sup>Kr放射性活度浓度

基于内充气正比计数器长度补偿法测量⁸⁵Kr放射性活度浓度

摘要: 放射性惰性气体活度浓度的绝对测量是进行其量值传递的基础。为实现放射性惰性气体⁸⁵Kr活度浓度的定值，本工作基于内充气正比计数器长度补偿法，进行了⁸⁵Kr放射性活度浓度的绝对测量。结果表明，在气压56.15 kPa、工作电压1675 V和 1700 V条件下，⁸⁵Kr放射性活度浓度为10.64 Bq/mL，合成标准不确定度为0.60%，与国际先进核素计量实验室关于⁸⁵Kr的测量结果的合成标准不确定度水平相当。

Abstract: The radioactivity concentration absolute measurement of radioactive noble gas is the basis for the transmission of its quantity value. In order to determinate the value of ⁸⁵Kr radioactivity concentration, the absolute measurement of ⁸⁵Kr radioactivity concentration was carried out based on the length-compensated internal gas proportional counting method. The results show that the radioactivity concentration of ⁸⁵Kr is 10.64 Bq/mL at pressure of 56.15 kPa and working voltage of 1 675 V and 1 700 V, and the combined standard uncertainty is 0.60%. The combined standard uncertainty is equivalent to the result reported by the international advanced nuclide metrology laboratory.