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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。
Stratified γ-ray scanning is an important method for qualitative and quantitative non-destructive testing and analysis of bulk nuclear waste samples. Hierarchical γ-scan, the detector in the measurement of the current layer will be radioactive interference adjacent layer, the layer cross-talk is the total amount of sample nuclide detection value and the actual value of one of the major factors of error. The calibration coefficients of each layer of nuclear waste drums were determined by the inter-layer compensation method. The Monte Carlo (MC) simulation and experimental measurements were used to accurately correct the volume overlap of the detection angle-covered waste drums. The experimental results show that the error between the correction value of the waste drum sample and the experimental value is within 10% and the accuracy is improved by 5%. Under the conditions of measurement and calculation errors, the radioactivity of radionuclides in the barrels can be accurately estimated and the detection accuracy can be improved.