摘要
光释光测年被广泛的应用于地球科学和考古学等领域的年代学研究,而如何准确测量环境剂量率是光释光测年的关键问题之一。研究利用丹麦RisøNutech所提供的铀(U)、钍(Th)、钾(K)等标样,标定了实验室的RGS-19A型NaIγ谱仪。选择不同类型沉积物,进行了不同测量时间对实验结果的影响研究,结果显示随着测量时间增加,测量误差减小,在测量时间达到6 h就可满足其要求,可作为测试样品的固定测量时间;进一步对于岩性均一以及岩性不均一的36个地质样品开展了RisøNaIγ谱仪法与ICP-MS法,RisøNaIγ谱仪法与中子活化法测定环境剂量率的对比研究。研究结果表明,对于大部分样品两组不同方法测量结果在误差范围内基本一致(±1σ),NaIγ谱仪与ICP-MS法及中子活化法的剂量率平均之比为1.13±0.03(n=36)。说明研究仪器测量结果是可靠的,此仪器RisøNaIγ谱仪可以广泛应用于不同类型沉积物光释光测年的环境剂量率测量中。
Optically stimulated luminescence dating is widely used in geochronology research in the fields of earth science and archaeology.How to accurately obtain environmental dose rate is one of the key problems in optically stimulated luminescence dating.In this study,the Laboratory RGS-19A NaIγspectrometer was calibrated using U,Th,K and other standard samples provided by RisøNutech in Denmark.Different types of sediments were selected to study the influence of different measurement time on the experimental results.The results showed that the measurement error decreased with the increase of measurement time,and the measurement time could meet the requirements when it reached 6 h,which could be used as the fixed measurement time of test samples.In addition,RisøNaIγspectrometer and ICP-MS,RisøNaIγspectrometer and neutron activation method were used for comparative study of homogeneous and heterogeneous lithology samples.The results showed that for most of the samples,the measurement results of the two groups were basically consistent within the error range(±1σ).The average dose rate ratio of NaIγspectrometer to ICP-MS and neutron activation method was 1.13±0.03(n=36).This indicates that the measurement results of this instrument are reliable,and the instrument can be widely used in environmental dose rate measurement of different types of sediments.
作者
孙渝
王懿萱
李国强
杨吉磊
赖忠平
SUN Yu;WANG Yi-xuan;LI Guo-qiang;YANG Ji-lei;LAI Zhong-ping(School of Geographic Science,Qinghai Normal University,Xining,810008,China;Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Xining,810008,China;Key Laboratory of Western China’s Environmental Systems,Ministry of Education,College of Earth and Environmental Science Lanzhou University,Lanzhou,730000,China;University of Chinese Academy of Sciences,Beijing,100049,China;Institute of Marine Science,Shantou University,Shantou,515063,China)
出处
《盐湖研究》
CAS
CSCD
2023年第4期78-87,共10页
Journal of Salt Lake Research
基金
青海省自然科学基金项目(2021-ZJ-981Q)
青海省“高端创新人才计划”(培养拔尖人才)项目
中国科学院仪器设备功能开发技术创新项目。
关键词
RisøNaIγ谱仪
环境剂量率
光释光测年
放射性核素分析
RisøNaIγspectrometer
Environmental dose rate
Optically stimulated luminescence dating
Radionuclide analysis
