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海洋沉积物光释光测年中环境剂量率测量方法对比分析

周从艳 姜涛 胡亦潘 陈康林 陈泓君 李亚琳 梁晨 贺泷

周从艳,姜涛,胡亦潘,等. 海洋沉积物光释光测年中环境剂量率测量方法对比分析[J]. 海洋学报,2023,45(4):121–132 doi: 10.12284/hyxb2023041
引用本文: 周从艳,姜涛,胡亦潘,等. 海洋沉积物光释光测年中环境剂量率测量方法对比分析[J]. 海洋学报,2023,45(4):121–132 doi: 10.12284/hyxb2023041
Zhou Congyan,Jiang Tao,Hu Yipan, et al. Comparations of environmental dose rate measurements for optically stimulated luminescence dating on marine sediments[J]. Haiyang Xuebao,2023, 45(4):121–132 doi: 10.12284/hyxb2023041
Citation: Zhou Congyan,Jiang Tao,Hu Yipan, et al. Comparations of environmental dose rate measurements for optically stimulated luminescence dating on marine sediments[J]. Haiyang Xuebao,2023, 45(4):121–132 doi: 10.12284/hyxb2023041

海洋沉积物光释光测年中环境剂量率测量方法对比分析

doi: 10.12284/hyxb2023041
基金项目: 国家自然科学基金面上项目(41976073)
详细信息
    作者简介:

    周从艳(1998-),女,湖北省襄阳市人,研究方向为海洋沉积物释光年代学。E-mail: 1792385510@qq.com

    通讯作者:

    姜涛(1979-),男,教授,主要从事海洋地质与资源等方面的研究。E-mail: taojiang@cug.edu.cn

  • 中图分类号: P736.4+1

Comparations of environmental dose rate measurements for optically stimulated luminescence dating on marine sediments

  • 摘要: 光释光测年作为一种沉积物绝对测年方法已在第四纪地质研究中得到了广泛应用,提高光释光测年精度和准确度一直是学术界关注的热点,长期以来人们对等效剂量测量程序和计算方法的研究十分丰富,而对环境剂量率的研究则相对较少。本文以琼西南海域ZBW钻孔岩心样品为例,利用电感耦合等离子质谱/发射光谱法(ICP-MS/OES)、中子活化分析(NAA)、γ谱仪法对海洋沉积物环境剂量率进行了对比测量。结果表明,在部分层段3种方法测量的结果存在差异,其原因为:(1)ICP-MS/OES前处理过程中重矿物中的U不完全溶解;(2)ICP-MS/OES测量结果为U、Th、K元素含量,包含了部分非放射性核素含量;(3)NAA测量用的样品量小,存在偶然性误差,样品中非放射性物质的稀释作用影响测量结果;(4)样品中存在铀系不平衡现象,结合研究区沉积环境和高纯锗γ谱仪测量结果进行对比分析表明,铀系不平衡主要来源于自生铀吸收,对环境剂量率的影响约为11%。
  • 图  1  2000年以来国内外海洋沉积物环境剂量率测量方法统计

    Fig.  1  Statistics of environmental dose rate measurements for marine sediments in the world since 2000

    图  2  ZBW钻孔位置及光释光样品取样位置图

    Fig.  2  Locations of Borehole ZBW and optically stimulated luminescence samples

    图  3  NAA,ICP-MS/OES和γ谱仪法测量的U、Th、K含量结果对比

    Fig.  3  Comparison of the results of U, Th and K contents measured by NAA, ICP-MS/OES and γ-ray spectrometry

    图  4  样品的环境剂量率及含水率结果

    Fig.  4  Environmental dose rate and water content of samples

    图  5  自生铀校正前后环境剂量率测量结果对比

    Fig.  5  Comparison of environmental dose rates results before and after authigenic uranium correction

    表  1  核素的特征γ射线能量和分支比

    Tab.  1  Characteristic γ-ray energies and branching ratios of radionuclides

    特征γ射线能量和分支比
    测量核素能量/keV分支比/%
    238U234Th63.34.8
    92.62.8
    232Th228Ac338.311.3
    911.226.6
    969.016.2
    40K40K1460.810.6
    下载: 导出CSV

    表  2  实验样品的U、Th、K含量以及环境剂量率结果对比

    Tab.  2  Comparison of U, Th and K contents and environmental dose rates of experimental samples

    样品号深度/mNAAICP-MS/OES高纯锗γ谱仪
    U含量/
    10−6
    误差/
    10−6
    Th含量/
    10−6
    误差/
    10−6
    K含量/
    %
    误差/
    %
    D/
    (Gy·ka−1)
    误差U含量/
    10−6
    误差/
    10−6
    Th含量/
    10−6
    误差/
    10−6
    K含量/
    %
    误差/
    %
    D/
    (Gy·ka−1)
    误差 U含量/
    10−6
    误差/
    10−6
    Th含量/
    10−6
    误差/
    10−6
    K含量/
    %
    误差/
    %
    D/
    (Gy·ka−1)
    误差
    ZBW-12112.470.1013.40.362.40.073.380.152.760.1414.90.752.370.073.530.163.470.539.810.572.120.043.160.16
    ZBW-14132.30.09120.342.310.063.180.142.680.1314.90.752.30.073.480.163.520.3410.180.342.170.033.250.15
    ZBW-17152.490.1012.50.352.140.063.140.142.590.1314.70.742.240.073.400.163.570.4910.880.502.120.043.280.17
    ZBW-18172.490.1013.30.362.320.063.380.152.570.1315.10.762.430.073.610.173.050.4211.030.472.240.043.290.16
    ZBW-24222.660.10130.352.340.073.410.152.890.1415.40.772.460.073.730.173.930.5511.370.422.250.043.540.18
    ZBW-29272.630.1012.60.352.220.063.040.142.750.1415.10.762.310.073.300.153.260.3310.610.512.100.042.960.14
    ZBW-60572.560.1012.30.352.110.063.070.142.770.1416.60.832.350.073.610.174.430.5110.830.452.130.043.440.19
    ZBW-62592.540.1011.80.342.210.062.960.132.890.1417.30.872.560.083.660.173.630.4612.450.412.290.043.320.16
    ZBW-65622.640.1012.50.352.090.062.990.142.730.1417.20.862.620.083.720.174.070.2912.430.652.430.043.580.17
    ZBW-69662.480.1013.60.362.590.073.530.153.030.1517.70.892.670.084.020.193.760.4711.200.662.390.043.530.17
    ZBW-70672.360.1012.80.352.110.062.940.133.080.1518.10.912.710.083.900.183.430.5912.500.532.270.043.290.17
    ZBW-72692.410.1012.90.352.180.062.960.133.090.1517.90.902.710.083.830.183.500.4511.590.782.390.043.280.16
    ZBW-74712.270.0911.70.332.120.062.830.133.070.15180.902.770.083.900.183.500.4412.020.592.420.043.350.16
    ZBW-76732.420.1012.40.352.050.062.780.133.150.1617.60.882.560.083.640.173.670.6012.620.582.330.043.280.17
    ZBW-77742.270.1011.10.342.030.062.780.122.490.1211.10.561.780.052.650.133.780.419.610.551.750.042.830.15
    ZBW-78752.250.0912.40.352.250.063.10.143.920.208.360.421.550.052.700.155.130.467.870.461.520.032.940.19
    ZBW-81782.230.10130.352.040.062.850.132.960.1516.50.831.980.063.210.174.220.4812.340.461.970.043.220.18
    ZBW-84802.530.1012.20.362.270.063.060.132.70.1412.60.631.650.052.680.144.280.5210.210.591.680.042.910.17
    ZBW-86822.210.1012.30.352.270.062.940.132.770.1414.70.742.030.063.060.154.410.5711.810.571.800.043.080.18
    ZBW-88842.280.0911.40.342.040.062.750.123.680.1821.61.082.170.073.860.215.900.6318.061.912.080.044.070.26
    ZBW-91872.140.1012.80.342.010.062.860.133.140.1617.70.892.230.073.600.184.150.4313.220.481.970.043.350.18
    ZBW-94892.460.1013.20.352.270.062.750.122.680.1315.70.792.480.073.080.143.610.3112.650.482.290.042.970.14
    ZBW-96912.330.0912.30.352.230.072.930.132.70.1415.40.772.430.073.360.153.900.2811.560.532.140.043.180.16
    下载: 导出CSV

    表  3  铀放射系中氡及其子体的占比(%)

    Tab.  3  Percentage of radon and its daughters in the uranium radioactive system (%)

    类别αβγ
    铀系54.759.594.6
    钍系58.163.863.4
    下载: 导出CSV

    表  4  样品不密封和密封测量结果对比

    Tab.  4  Comparison of results of unsealed and sealed measurements of samples

    ZBW-18ZBW-24ZBW-62ZBW-76
    比活度/(Bq·kg−1比值比活度/(Bq·kg−1比值比活度/(Bq·kg−1比值比活度/(Bq·kg−1比值
    Rn-222 (不密封)29.060.9526.680.9526.080.9227.130.96
    Rn-222 (密封)30.5128.2328.5028.40
    下载: 导出CSV

    表  5  样品238U和226Ra比活度及Uauth含量对比

    Tab.  5  Comparison of 238U and 226Ra and Uauth contents in samples

    样品编号深度/m238U比活度/(Bq·kg−1误差226Ra比活度/(Bq·kg−1误差Ra/U误差Uauth比活度/(Bq·kg−1误差Uauth/U
    ZBW-121143.166.5928.851.170.670.1111.240.460.26
    ZBW-141343.834.1729.510.710.670.0710.720.280.24
    ZBW-171544.436.1430.921.070.700.109.030.410.20
    ZBW-181737.905.2230.510.990.800.112.010.380.05
    ZBW-242248.856.8828.230.940.580.0811.850.340.24
    ZBW-292740.614.1136.231.370.890.106.090.420.15
    ZBW-605755.076.3236.751.330.670.0819.840.360.36
    ZBW-625945.125.6928.491.120.630.084.610.330.10
    ZBW-656250.593.5928.351.190.560.0510.150.520.20
    ZBW-696646.745.8131.290.940.670.0910.310.540.22
    ZBW-706742.647.3230.161.290.710.131.990.430.05
    ZBW-726943.505.6433.671.210.770.105.800.630.13
    ZBW-747143.535.4432.271.290.740.104.430.480.10
    ZBW-767345.607.4428.401.200.620.104.540.470.10
    ZBW-777446.975.1325.410.900.540.0615.710.450.33
    ZBW-787563.825.6724.731.240.390.0438.220.370.60
    ZBW-817852.456.0334.711.190.660.0812.310.370.23
    ZBW-848053.286.4827.690.900.520.0720.080.480.38
    ZBW-868254.797.1136.961.210.670.0916.370.460.30
    ZBW-888473.447.7833.700.960.460.0514.691.550.20
    ZBW-918751.575.3938.321.300.740.088.560.390.17
    ZBW-948944.953.8332.651.140.730.073.790.380.08
    ZBW-969148.473.5130.921.120.640.0510.870.430.22
    下载: 导出CSV
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  • 收稿日期:  2022-10-11
  • 修回日期:  2022-11-07
  • 网络出版日期:  2023-03-28
  • 刊出日期:  2023-03-31

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