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基于蒙卡模拟的分段γ扫描无源效率刻度方法

郑洪龙 庹先国 苟家元 吴耀 左伟 郭雨非 何琳 刘艳芳 黄聪 阳林锋 刘伟

郑洪龙, 庹先国, 苟家元, 等. 基于蒙卡模拟的分段γ扫描无源效率刻度方法[J]. 强激光与粒子束, 2020, 32: 046002. doi: 10.11884/HPLPB202032.190416
引用本文: 郑洪龙, 庹先国, 苟家元, 等. 基于蒙卡模拟的分段γ扫描无源效率刻度方法[J]. 强激光与粒子束, 2020, 32: 046002. doi: 10.11884/HPLPB202032.190416
Zheng Honglong, Tuo Xianguo, Gou Jiayuan, et al. A passive efficiency calibration method with Monte Carlo simulation in segmented gamma scanning[J]. High Power Laser and Particle Beams, 2020, 32: 046002. doi: 10.11884/HPLPB202032.190416
Citation: Zheng Honglong, Tuo Xianguo, Gou Jiayuan, et al. A passive efficiency calibration method with Monte Carlo simulation in segmented gamma scanning[J]. High Power Laser and Particle Beams, 2020, 32: 046002. doi: 10.11884/HPLPB202032.190416

基于蒙卡模拟的分段γ扫描无源效率刻度方法

doi: 10.11884/HPLPB202032.190416
基金项目: 国家自然科学基金项目(41874213,41604154)
详细信息
    作者简介:

    郑洪龙(1989—),男,博士,助理研究员,从事核辐射探测方法研究;zhenghlswust@126.com

    通讯作者:

    庹先国(1965—),男,博士,教授,从事核技术及应用研究;tuoxg@cdut.edu.cn

  • 中图分类号: TL814

A passive efficiency calibration method with Monte Carlo simulation in segmented gamma scanning

  • 摘要: 针对200 L核废物桶分段γ扫描(SGS)过程中的效率刻度问题,提出了一种效率刻度函数模型,采用MCNP程序计算不同基质密度和γ射线能量条件下的离散断层效率,经过多元非线性回归获取函数参数,从而建立效率刻度函数,实现核废物桶SGS断层效率刻度。对核废物桶样品进行实验分析,结果表明:对于桶内基质分别为密度0.310 g·cm−3的硅酸铝、密度0.595 g·cm−3的木质纤维,桶内核素分别为活度3.110×105 Bq的点源137Cs、活度1.371×105 Bq的点源60Co,在桶内仅有单个点源存在的核素分布极端不均匀情况下,桶内核素活度重建误差在−37.68%~31.52%范围内。本文的方法能够准确有效实现核废物桶SGS断层效率矩阵计算,并确定核废物桶内放射性核素活度,满足实际检测要求。
  • 图  1  核废物桶SGS检测原理

    Figure  1.  SGS measurement of nuclear waste drum

    图  2  HPGe探测器MCNP模型

    Figure  2.  MCNP model of an HPGe detector

    图  3  SGS效率计算模型

    Figure  3.  Calculation model of SGS efficiency

    图  4  断层效率分布

    Figure  4.  Distribution of segment efficiency

    图  5  SGS实验测量

    Figure  5.  SGS experimental measurement

    图  6  点源在桶中位置变化

    Figure  6.  Positions of point source in the drum

    图  7  效率矩阵

    Figure  7.  Efficiency matrices (aluminum silicate sample)

    图  8  两种刻度函数参数下活度重建结果对比

    Figure  8.  Comparison of reconstructed activity with two sets of parameters (F1 and F2 represent parameters calibrated by aluminum silicate and wood fiber respectively, as shown in Table 1)

    表  1  效率刻度函数参数

    Table  1.   Parameters of efficiency function

    calibrating materialspacingparameter
    a1a2a3a4a5a6R2
    aluminum silicate0 layer between detector and segment−8.214−0.322−0.681−0.0340.101−0.6010.998
    1 layer between detector and segment−8.376−0.303−0.870−0.0510.110−0.5640.998
    2 layers between detector and segment−10.094−0.015−2.014−0.0140.2240.3460.996
    wood fiber0 layer between detector and segment−8.152−0.312−0.676−0.0310.102−0.7130.999
    1 layer between detector and segment−8.341−0.293−0.888−0.0470.111−0.6370.998
    2 layers between detector and segment−10.0520.011−2.098−0.0150.2310.2760.996
    下载: 导出CSV

    表  2  137Cs和60Co核素的重建活度和误差

    Table  2.   Reconstructed activities and errors of 137Cs and 60Co

    samples
    No.
    activity in aluminum silicate/Bq(error/%)activity in wood fiber/Bq
    0.662 MeV1.173 MeV1.332 MeV0.662 MeV1.173 MeV1.332 MeV
    1# 2.869×105(−7.74) 1.479×105(7.89) 1.403×105(2.33) 1.938×105(−37.68) 1.119×105(−18.35) 1.102×105(−19.54)
    2# 3.025×105(−2.74) 1.591×105(16.08) 1.532×105(11.77) 2.138×105(−31.25) 1.265×105(−7.68) 1.197×105(−12.6)
    3# 3.096×105(−0.46) 1.646×105(20.08) 1.512×105(10.32) 2.235×105(−28.15) 1.273×105(−7.09) 1.211×105(−11.64)
    4# 3.079×105(−0.99) 1.468×105(7.07) 1.396×105(1.79) 2.129×105(−31.56) 1.239×105(−9.6) 1.199×105(−12.48)
    5# 3.134×105(0.78) 1.582×105(15.39) 1.513×105(10.36) 2.199×105(−29.3) 1.265×105(−7.64) 1.215×105(−11.34)
    6# 3.243×105(4.29) 1.640×105(19.61) 1.568×105(14.34) 2.474×105(−20.44) 1.347×105(−1.7) 1.302×105(−4.93)
    7# 3.445×105(10.78) 1.739×105(26.81) 1.640×105(19.66) 2.972×105(−4.43) 1.567×105(14.35) 1.463×105(6.81)
    8# 3.680×105(18.32) 1.803×105(31.52) 1.745×105(27.24) 3.579×105(15.07) 1.794×105(30.97) 1.708×105(24.65)
    9# 3.316×105(6.63) 1.646×105(20.07) 1.572×105(14.68) 2.670×105(14.13) 1.442×105(5.28) 1.377×105(0.54)
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-10-29
  • 修回日期:  2019-12-21
  • 刊出日期:  2020-03-06

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