摘要
分层γ扫描技术是针对桶装核废物样品定性、定量无损检测与分析的一种重要方法。分层γ扫描时,探测器在测量当前层的时候会受到临近层放射性的干扰,层间串扰是导致样品核素总量检测值与实际值产生较大误差的重要因素之一。通过层间补偿的方法确定核废物桶每层样品的校正系数,采用蒙特卡罗(Monte-Carlo,MC)模拟与实验测量对探测张角覆盖废物桶的体积重叠部分进行准确校正。实验结果表明,废物桶样品校正值与实验值误差均在10%以内,精确度提高了5%。在测量和计算误差存在的条件下,可以准确估计出放射性废物桶内核素放射性活度,提高检测精度。
Background： Segmented gamma scanning （SGS） measure is an important technique for qualitative and quantitative analysis of nuclear scrap and radioactive waste （NSRW）. Purpose： This study aims to improve the accuracy of the point source activity of NSRW measured by SGS for each segment with compensation of the wedge-disturbing effect. Methods： The calibration coefficients of each segment were determined by the method of inter-segment compensation. Monte-Carlo simulation and experimental measurements were employed to accurately calibrate the detected region overlap of the segments using HPGe detector. Results： The experimental results show the wedge-disturbing effect can be effectively removed with this proposed method. The relative error is within 10% of the experimental value and the accuracy in the estimate of point source activity increases by 5%. Conclusion： The correction analysis using calibration coefficient is feasible and effective for SGS technique.
出处
《核技术》
CAS
CSCD
北大核心
2017年第11期23-26,共4页
Nuclear Techniques
基金
国家自然科学基金(No.41374130
No.41604154)
人工智能四川省重点实验室开放基金项目(No.2016RYJ08)
四川省科技计划项目(No.2017GZ0359)
四川省军民结合产业发展专项资金(No.16zs9101)资助~~
关键词
放射性废物
分层γ扫描
层间串扰
蒙特卡罗模拟
定量测量
Radioactive waste, SGS, Wedge-disturbing, Monte-Carlo simulation, Quantitative analysis
