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241Am-Be中子参考辐射的蒙特卡罗模拟研究

张颂 魏彪 刘易鑫 毛本将 钱易坤 黄宇晨 冯鹏

张颂, 魏彪, 刘易鑫, 等. 241Am-Be中子参考辐射的蒙特卡罗模拟研究[J]. 强激光与粒子束, 2020, 32: 056001. doi: 10.11884/HPLPB202032.190478
引用本文: 张颂, 魏彪, 刘易鑫, 等. 241Am-Be中子参考辐射的蒙特卡罗模拟研究[J]. 强激光与粒子束, 2020, 32: 056001. doi: 10.11884/HPLPB202032.190478
Zhang Song, Wei Biao, Liu Yixin, et al. Monte Carlo simulation research on reference neutron radiation of 241Am-Be radionuclide[J]. High Power Laser and Particle Beams, 2020, 32: 056001. doi: 10.11884/HPLPB202032.190478
Citation: Zhang Song, Wei Biao, Liu Yixin, et al. Monte Carlo simulation research on reference neutron radiation of 241Am-Be radionuclide[J]. High Power Laser and Particle Beams, 2020, 32: 056001. doi: 10.11884/HPLPB202032.190478

241Am-Be中子参考辐射的蒙特卡罗模拟研究

doi: 10.11884/HPLPB202032.190478
基金项目: 中央高校基本科研业务费国防创新专项(2018CDGFGD0008);国家自然科学基金青年基金项目(11805111)
详细信息
    作者简介:

    张 颂(1995—),男,硕士研究生,从事电离辐射剂量学研究;zhangsong372@126.com

    通讯作者:

    冯 鹏(1981—),男,博士,副教授,从事核信号检测技术及其应用研究;coe-fp@cqu.edu.cn

  • 中图分类号: TL72

Monte Carlo simulation research on reference neutron radiation of 241Am-Be radionuclide

  • 摘要:

    研究用于校准场所中子剂量监测仪表的241Am-Be中子参考辐射场计量特性。采用蒙特卡罗方法模拟了空气自由中子参考辐射(FRNR),GB/T 14055规定的最小尺寸中子参考辐射(SRNR)和实际中子参考辐射(ARNR)中不同检验点处中子周围剂量当量率、散射中子占比和能谱分布特征。研究结果表明,空气对FRNR中的剂量率和能谱分布影响小,近似为理想中子参考辐射;采用5%含硼聚乙烯作屏蔽的最小尺寸SRNR可减少热中子,降低散射中子占比,影锥法不适用于小尺寸中子参考辐射中对散射中子的修正;ARNR中的散射中子更少、占比更低,影锥法所得散射中子占比与理论值基本一致。

  • 图  1  241Am-Be中子源能谱

    Figure  1.  Neutron energy spectrum of a 241Am-Be source

    图  2  SRNR模型

    Figure  2.  SRNR models

    图  3  影锥模型

    Figure  3.  Model of shadow cone

    图  4  不同条件下FRNR中各检验点中子能谱分布

    Figure  4.  Neutron energy spectrum distribution at each point of test under different FRNR

    图  5  SRNR中各检验点剂量率

    (A:polyethylene containing 5% boron,B:concrete;solid line:half-cubical type,dotted line:cubical type)

    Figure  5.  Dose rate of each point of test under SRNR

    图  6  半立方体SRNR中各检验点中子能谱分布

    Figure  6.  Neutron energy spectrum distribution at each point of test under half-cubical type SRNR

    图  7  三种中子参考辐射中各检验点剂量率(屏蔽材料:混凝土)

    Figure  7.  Dose rate of each point of test under three kinds of reference neutron radiation (shielding material:concrete)

    图  8  三种中子参考辐射中0.75 m处检验点中子能谱分布(屏蔽材料:混凝土)

    Figure  8.  Neutron energy spectrum distribution at 0.75 m point of test under three kinds of reference neutron radiation (shielding material:concrete)

    表  1  FRNR和空气FRNR中各检验点剂量率、空气散射贡献占比

    Table  1.   The dose rate of each point of test and the contribution proportion of air scattering in FRNR and air FRNR

    distance/mdose rate/(μSv·h−1)④the contribution proportion of
    air scattering obtained by
    shadow-cone method(③/①)/%
    ⑤the theoretical contribution
    proportion of air
    scattering[(②—①)/①]/%
    ①FRNR②FRNR+air③FRNR+air+
    shadow cone
    0.7552.0152.240.701.350.44
    0.8540.4940.690.521.280.49
    0.9532.4232.590.421.300.52
    1.0526.5326.690.361.360.60
    1.1522.1222.260.321.450.63
    1.2518.7218.850.281.500.69
    1.3516.0516.170.251.560.75
    下载: 导出CSV

    表  2  SRNR中各检验点散射中子剂量率贡献占比(影锥法)

    Table  2.   The contribution proportion of scattered neutron dose rate at each point of test under SRNR (shadow-cone method)

    typecontribution proportion at different distance/%
    0.75 m0.85 m0.95 m1.05 m1.15 m1.25 m1.35 m
    A18.2910.0311.9314.0016.1618.4220.77
    A28.5610.7313.1915.8918.7021.3322.90
    B117.1121.2725.8030.7035.9441.5247.57
    B218.6223.8929.7736.2343.1650.1855.99
    Notes:A—polyethylene containing 5% boron,B—concrete;1—half-cubical type,2—cubical type
    下载: 导出CSV

    表  3  SRNR中各检验点散射中子剂量率贡献占比(理论值)

    Table  3.   The contribution proportion of scattered neutron dose rate at each point of test under SRNR (theoretical value)

    typecontribution proportion at different distance/%
    0.75 m0.85 m0.95 m1.05 m1.15 m1.25 m1.35 m
    A17.529.3511.3213.3915.5917.9120.37
    A28.0910.3813.0216.0219.4523.3627.85
    B116.5920.8125.3730.3235.6441.3547.45
    B218.7024.0530.2137.2445.3454.7265.89
    Notes:A—polyethylene containing 5% boron,B—concrete;1—half-cubical type,2—cubical type
    下载: 导出CSV

    表  4  三种中子参考辐射中各检验点散射中子剂量率贡献占比(屏蔽材料:混凝土)

    Table  4.   The contribution proportion of scattered neutron dose rate at each point of test under three kinds of reference neutron radiation (shielding material:concrete)

    typecontribution proportion at different distance/%
    0.75 m0.85 m0.95 m1.05 m1.15 m1.25 m1.35 m
    FRNR+airshadow-cone method1.351.281.301.361.451.501.56
    ARNRshadow-cone method10.9713.6516.5719.6922.9926.4630.07
    SRNR(1)shadow-cone method17.1121.2725.8030.7035.9441.5247.57
    SRNR(2)shadow-cone method18.6223.8929.7736.2343.1650.1855.99
    FRNR+airtheoretical value0.440.490.520.600.630.690.75
    ARNRtheoretical value10.4813.1216.0119.0722.3625.7629.37
    SRNR(1)theoretical value16.5920.8125.3730.3235.6441.3547.45
    SRNR(2)theoretical value18.7024.0530.2137.2445.3454.7265.89
    Notes:1—half-cubical type,2—cubical type
    下载: 导出CSV
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  • 收稿日期:  2019-12-22
  • 修回日期:  2020-02-19
  • 刊出日期:  2020-02-10

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