南海东北部表层海水中^(226)Ra的分布  

THE DISTRIBUTION OF ^(226)Ra IN THE SURFACE WATER OF THE NORTHEASTERN SOUTH CHINA SEA

作　　者：黄奕普[1] 姜德盛 徐茂泉[1] 陈敏[1] 邱雨生[1] 

机构地区：[1]厦门大学海洋学系,厦门361005

出　　处：《热带海洋》1997年第2期75-81,共7页

基　　金：国家自然科学基金!49456001;高等学校博士学科点专项科研基金

摘　　要：报道1994航次南海东北部的226Ra。利用Mn－纤维富集海水中的Ra同位素，采用Mn－纤维直接射气法测量226Ra的比活度，228Ra的比活度采用228Ac的β计数法测量。研究海区226Ra的放射性比活度范围为0．62－1．17Bq·m-3,228Ra／226Ra）A.R介于2.78－4.59。226Ra的表层比活度分布大致表现为该海区东北部较高，中南部也有一较大值，表明陆源物质对这两个区域水体中的226Ra的贡献很大，其它区域分布较均匀。表层228Ra／226Ra）AR分布为靠近珠江口和西南区较高。此外，还将本航次的结果与该海区1992年春季航次的结果进行了比较。226Ra in the northeastern South China Sea during a crinse in 1994 has been reported in this paper. Radium isotopes in seawater were concentrated by Mn-fibre. 226 Ra activity was measured by Mn-fibre direct emanation while 228 Ac β-counting method was applied to determine are Ra activity. ase Ra radioactivity in the studied area ranged from 0.62 to 1.17 Bq - m-3 with 228 Ra /226Ra )A R between 2.78 and 4.59. The distribution of 226 Ra specific activities in surface waters approalmately show that there are high values in both northeast and middle south of the studied area while it is uniform in the other regions. The distribution of are Ra/ 226 Ra A R in surface waters was discussed. Furthermore, the results from this crulse were compared with the results obtained from a spring cruise in 1992.

关 键 词：海水 表层海水 南海 镭226 同位素 

分 类 号：P734.24[天文地球—海洋化学]