Correction of radioactive waste drums wedge-disturbing effect of segmented gamma scanning

Yuqi LIU; Xianguo TUO; Rui SHI; Honglong ZHENG

doi:10.11889/j.0253-3219.2017.hjs.40.110202

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Correction of radioactive waste drums wedge-disturbing effect of segmented gamma scanning

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- Correction of radioactive waste drums wedge-disturbing effect of segmented gamma scanning
- NUCLEAR TECHNIQUES Vol. 40, Issue 11, Article number: 110202(2017)
- 作者机构：
  
  1.西南科技大学核废物与环境安全国防重点学科实验室绵阳 621010
  2.四川理工学院化学与环境工程学院自贡 643000
  3.成都理工大学地质灾害防治与地质环境保护国家重点实验室成都 610059
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;National Natural Science Foundation of China;the Opening Project of Key Laboratory of Artificial Intelligence in Sichuan Province;the Sichuan Science and Technology Project of China;the Sichuan Military and Civilian Development of Special Funds
- DOI：10.11889/j.0253-3219.2017.hjs.40.110202
  CLC： TL99
- Received：03 January 2017，
  
  Revised：09 May 2017，
  
  Published：10 November 2017
- 稿件说明：
移动端阅览
Yuqi LIU, Xianguo TUO, Rui SHI, et al. Correction of radioactive waste drums wedge-disturbing effect of segmented gamma scanning[J]. Nuclear techniques, 2017, 40(11): 110202
DOI：

Yuqi LIU, Xianguo TUO, Rui SHI, et al. Correction of radioactive waste drums wedge-disturbing effect of segmented gamma scanning[J]. Nuclear techniques, 2017, 40(11): 110202 DOI： 10.11889/j.0253-3219.2017.hjs.40.110202.

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。

Abstract

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.

关键词

Keywords

references

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