东太平洋多金属结核中放射性核素的不破坏γ谱分析

刘广山; 黄奕普; 蔡毅华; 陈敏

东太平洋多金属结核中放射性核素的不破坏γ谱分析

厦门大学海洋系, 亚热带海洋研究所, 福建厦门361005

基金项目: 中国大洋矿产资源研究开发协会“九五”国家专项资助项目(DY95-02-15)

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出版历程
- 收稿日期: 2000-07-03
- 修回日期: 2000-10-16

Non-destructive γ spectrum analysis of polymetallic nodules from the eastern Pacific

Department of Oceanography, Institute of Subtropical Oceanography, Xiamen University, Xiamen 361005, China

摘要

摘要: 用HPGeγ谱仪不破坏地直接测定了采自东太平洋的20个多金属结核样品,样品中可探测到的核素有²³⁸U,²³⁰Th,²²⁶Ra,²¹⁰Pb,²²⁸Ra,²²⁸Th,²³⁵U,²²⁷Ac(或²³¹Pa)和⁴⁰K.对样品顶侧和底侧分别面对探测器的计数率和计数率比进行了分析,获得了其所蕴含的多金属结核生长、运动、放射性核素来源及其与环境关系的信息.提出了判断多金属结核顶、底侧的新方法.并根据顶、底侧²³⁰Th计数率比推测多金属结核不同的滚动时间.
- 东太平洋 /
- 多金属结核 /
- 放射性核素 /
- γ-能谱分析
Abstract: Non-destructive γ spectrum analyses of 20 polymetallic nodules from the eastern Pacific are carried out.Numerous nuclides, such as ²³⁸U,²³⁰Th,²²⁶Ra,²¹⁰Pb,²²⁸Ra,²²⁸Th,²³⁵U,²²⁷Ac(or ²³¹Pa) and ⁴⁰K are detected.The count rates of the nuclide when top or bottom side of nodules facing detector are measured and the ratio R of the count rates of nuclides in the top and the bottom sides are obtained.From counts and ratios, some useful information relating to the growth and movement of the nodules, the source of nuclide and relationship between those and environment can be gotten.A new method for clear distinction between the top and bottom sides of the nodule based on the R value of ²²⁶Ra or ²¹⁰Pb is developed.In addition, one can infer the turnover of nodules according to the Rvalue of ²³⁰Th.
- the eastern Pacific /
- polymetallic nodule /
- radionuclide /
- γ-spectrometry

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参考文献(13)

黄奕普,罗尚德,施文远,等.深海锰结核的放射化学研究[J].海洋学报,1987,9(1):36～44.

夏明,张承蕙.我国南海海盆一块锰壳层的生长速率及某些地球化学特征[J].沉积学报,1983,1(2):131～142.

KU T L,BROCKER W S.Radiochemical studies on manganese nodules of deep-sea origin[J].Deep-Ses Res,1969,16:625～637.

HUH C A,KU T L.Radiochemical observations on manganese nodules from three sedimentary environments in the North Pacific[J].Geochim Cosmochim Acta,1984,48:951～963.

KRISHMASWAMI S,MANGINI A,THOMAS J H,et al.10Be and Th isotopes in manganese nudules and adjacent sediments:nodule growth,histories and nuclide behavior[J].Earth Planet Sci Lett,1982,59:217～234.

KRISHMASWAMI S,COCHRAN J K.Uranium and thorium series nuclides in oriented ferromanganese nodules:growth rates,turnover times,and nuclides behavior[J].Earth Planet Sci Lett,1978,40:45～62.

PIPER D Z,WILLIAMSON M E.Regional and depth variations in the elemental and mineralogical composition of ferromanganese nodules from the pelagic environment of Pacific Ocean[J].Mar Geol,1977,23:285～303.

罗尚德,王蕾,黄奕普.深海锰结核中元素的扩散及深度分布特征研究[J].海洋学报,1989,11(1):42～48.

EBBINGJHJ,Van der Borg K,De JONG A F M,et al.Continuous surface dwelling of manganese nodules on a hill on the Madeira Abyssal Plain during abrupt sedimentation changes[J].Marine Geology,1991,98:73～82.

约翰L梅罗.海洋矿物资源[M].马超英,孙英,黄文盛等译.北京:地质出版社.1980.

YOKOYAMA Y,NGUYEN H V.应用高分辨γ能谱法直接和不破坏试样地测量沉积物、锰结核和珊瑚的年龄[A].戈德堡,堀部纯男,猿桥胜子.同位素海洋化学[M].黄奕普,施文远,邹汉阳等译.北京:海洋出版社,1990.165～183.

苏琼,钟志兆,高亚民.低本底反康普顿高纯锗γ谱仪[J].核电子学与探测技术,1988,8(5):257.

刘广山,黄奕普.海洋沉积物γ射线质量衰减系数[J].厦门大学学报(自然科学版),1999,38(3):441～447.

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