【摘要】 为了实现核设施退役现场α气溶胶的实时连续测量,开展了针对各单独核素的天然本底跟踪补偿技术研究,并对连续测量模式下的α气溶胶探测灵敏度进行了研究。通过理论分析及实验研究,实现了α气溶胶实时连续测量过程中天然本底的α能谱向前拖尾部分的影响的自动跟踪补偿,使用该方法对天然本底进行扣除,其扣除率大于90%。使用建立的实时连续测量过程中针对各单独核素的天然本底跟踪补偿技术及气溶胶的分粒度连续取样技术进行了α气溶胶浓度连续测量模式的探测灵敏度研究,当监测时间为25 min,氡子体浓度为100 Bq·m-3时,对α气溶胶浓度连续测量的探测灵敏度为0.02 Bq·m-3。更多还原

【Abstract】 This research addresses problems in conducting continuous monitoring of α aerosols at decommissioning sites. According to the theoretical analysis and experiment results,the method of nuclide natural background compensation was used,realized the spectrum forword trailing compensating of natural background. The compensating efficiency is greater than 90%. An α aerosols continuous monitoring system was set up using natural background correction technology and the differentiated particle size sampling technology. The detection sensitivity for Pu aerosols in 25 minute is 0. 02 Bq·m- 3when the concentration of radon thorium progeny is 100 Bq·m- 3.更多还原