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不同射线能量及线衰减系数条件下体源探测效率的函数模型

李志刚 庹先国 石睿 杨剑波 何艾静 郑洪龙

李志刚, 庹先国, 石睿, 等. 不同射线能量及线衰减系数条件下体源探测效率的函数模型[J]. 强激光与粒子束, 2018, 30: 126002. doi: 10.11884/HPLPB201830.180218
引用本文: 李志刚, 庹先国, 石睿, 等. 不同射线能量及线衰减系数条件下体源探测效率的函数模型[J]. 强激光与粒子束, 2018, 30: 126002. doi: 10.11884/HPLPB201830.180218
Li Zhigang, Tuo Xianguo, Shi Rui, et al. A functional model for determining body source detection efficiency under different radiation energy and line attenuation coefficients[J]. High Power Laser and Particle Beams, 2018, 30: 126002. doi: 10.11884/HPLPB201830.180218
Citation: Li Zhigang, Tuo Xianguo, Shi Rui, et al. A functional model for determining body source detection efficiency under different radiation energy and line attenuation coefficients[J]. High Power Laser and Particle Beams, 2018, 30: 126002. doi: 10.11884/HPLPB201830.180218

不同射线能量及线衰减系数条件下体源探测效率的函数模型

doi: 10.11884/HPLPB201830.180218
基金项目: 

国家自然科学基金项目 41874213

国家自然科学基金青年基金项目 41604154

四川省科技计划项目 2017CC0076

四川省科技计划项目 2017GZ0362

宜宾市科技局科技自主创新专项 2016ZSF012

详细信息
    作者简介:

    李志刚(1992-), 男, 硕士研究生, 从事核辐射探测方法与技术研究, 18380530516@163.com

    通讯作者:

    庹先国(1965-), 男, 教授, 从事核辐射探测方法与技术研究, tuoxg@cdut.edu.cn

  • 中图分类号: TL99

A functional model for determining body source detection efficiency under different radiation energy and line attenuation coefficients

  • 摘要: 基于放射性废物桶内所含介质材料和放射性核素分段均匀分布的假设, 采用蒙特卡罗程序模拟计算多种射线能量、多种样品密度条件下的线衰减系数和体源探测效率, 通过多元非线性拟合得到以线衰减系数和能量为自变量的体源探测效率函数。基于壳源法, 通过多个点源组合测试近似替代均匀体源的实验测量, 对3种能量射线和3种密度的样品进行验证实验, 利用蒙卡模拟与数值拟合结合方法和实验测量两种方式获得各自的体源探测效率, 完成活度估算。两种方式活度估算结果相对误差均小于23%。通过蒙卡模拟与数值拟合结合方法所得结果与实验结果基本吻合, 证明了该方法的有效性。
  • 图  1  探测器准直器示意图

    Figure  1.  Sketch map of collimator of detector

    图  2  不同线衰减系数、不同射线能量下的探测效率散点图

    Figure  2.  Scatter plot of detection efficiency with different line attenuation coefficient and different ray energy

    图  3  数据拟合结果。“a”,“b”,“c”,“d”分别代表了四种函数模型的拟合结果,编号中“1”和“2”表示正对层的探测效率和各离散点的相对误差,“3”和“4”表示相邻层的探测效率和各离散点的相对误差

    Figure  3.  The fitting results of the data. "a", "b", "c", "d" represent the fitting results of the four function models, respectively. Number "1" and "2" indicate the detection efficiency of the current layer and the relative error of each discrete point, respectively. Number "3" and "4" indicate the detection efficiency of adjacent layers and the relative error of each discrete point, respectively

    图  4  壳源沿径向不同测量位置上分布

    Figure  4.  Shell-source distribution

    图  5  两种方法获得的放射源活度值与该放射源标称值的相对误差

    Figure  5.  Relative error between the activity value of the radioactive source obtained by two methods and the nominal value of the radioactive source

    表  1  四种函数模型参数拟合结果

    Table  1.   Parameters of detection efficiency function

    coefficient a1 a2 a3 a4 a5 a6 a7
    the current layer
    Mode a1 -0.117 3 1.295 4 0.000 3 -1.331 0 0.084 8 -15.04 9
    Mode b1 -0.117 2 1.023 5 12.690 1 -14.07 4 0.550 6 -10.48 0
    Mode c1 -2.5×10-6 0.8179 458.713 6.689×106 -0.817 9 -5.12×106 -458.71
    Mode d1 -4.400 3 1.291 5 2.101 5 -0.117 2 0.083 7 -12.320
    the adjacent layer
    Mode a2 0.010 8 -0.083 1 0.004 8 -2.697 3 0.209 2 -15.459
    Mode b2 0.010 3 -0.797 7 27.464 2 -33.782 1.965 4 -5.768 6
    Mode c2 5.03×10-7 -0.861 -1.61×106 -3.53×106 0.861 -7.51×104 -1606
    Mode d2 6.598 9 -0.085 6 4.842 0 0.010 8 0.208 6 -25.807
    下载: 导出CSV

    表  2  多点源组合实验测量与均匀体源模拟测量结果比较

    Table  2.   Comparison of multi-source combined experiment measurement and uniform body source simulation

    nuclide energy/MeV methods detection efficiency relative error/%
    137Cs 0.662 shell-source 0.000 264 -3.7
    MC 0.000 254
    60Co 1.173 shell-source 0.000 197 -4.1
    MC 0.000 189
    1.332 shell-source 0.000 186 -4.3
    MC 0.000 178
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-08-14
  • 修回日期:  2018-10-18
  • 刊出日期:  2018-12-15

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