九龙江河口区水体中的^(226)Ra和^(228)Ra  

^(226)Ra and ^(228)Ra in Jiulong estuarine area

作　　者：谢永臻[1] 黄奕普[1] 施文远[1] 徐茂泉[1] 邱雨生[1] 阮德记 

机构地区：[1]厦门大学海洋系,厦门361005

出　　处：《台湾海峡》1994年第4期394-399,共6页Journal of Oceanography In Taiwan Strait

基　　金：国家教委博士学科点专项科研基金;厦门市海洋管理处海洋研究开发基金

摘　　要：用MnO2－纤维富集大体积水样中的Ra同位素，并用直接射气法测定（226）Ra和（228）Ac的（226）β计数法测定（228）Ra的方法，研究了九龙江河口区（226）Ra、（228）Ra的行为，结果表明：在该河口区（226）Ra、（226）Ra均呈非保守行为，（226）Ra、（228）Ra的最高值分别在盐度为19和9处测得。（228）Ra／（226）Ra）A.R。值在盐度小于19的区域约为3左右。与世界其他河口区相比，九龙江河口区的（226）Ra、（228）Ra有两个特征：其一是（226）Ra、（228）Ra的最大值较高；其二是（228）Ra／（226）A.R。值高于世界平均水平，本文对此进行了分析与讨论。Behaviors of 226Ra, 228Ra in the Jiulong estuary were studied by using MnO2 fiber to concentrated Ra from large volume water samples, Both isotopes were analyzed by emanation of MnO2-fiber which adsorbed Ra isotopes, and βcounting 228Ac, daughter of 228Ra, respective-ly. Results showed that in this area, both 226Ra and 228Ra performed non-conserved behaviors and the maximum value of 226Ra and 228Ra were detected at stations with S = 19 and S= 9, respectlvely. 228Ra/226Ra )A.R. was near 3 in the area with an S less than 19. Compared with other estuaries, there are two characteristics in the Jiulong estuary, one is the larger maximum of 226Ra,228Ra, and the other is higher 228Ra/226Ra )A.R. The causes of these results are under study

关 键 词：河口区 镭226 镭228 同位素 海洋化学 水体 

分 类 号：P734.21[天文地球—海洋化学]