Simultaneous Concentration and Determination of ￣(226)Ra,￣(228)Ra in Natural Waters

采用ＭｎＯ＿２－纤维富集法同时富集天然水中的￣（２２６）Ｒａ、￣（２２８）Ｒａ，接着用ＭｎＯ＿２－纤维直接射气法测定￣（２２２）Ｒｎ及其子体α放射性的方法测定￣（２２６）Ｒａ，对￣（２２８）Ｒａ则通过测定第一代子体￣（２２８）Ａｃ的β放射性的方法加以确定。通过对河水、海水、地下水、井水等各种水样的实际验证，表明该测定程序具有灵敏、准确可靠、简便、易于掌握等优点，适用于天然水体中低含量￣（２２６）Ｒａ、￣（２２８）Ｒａ的测定。 【英文摘要】 ?226)Ra,￣(228)Ra in natural waters are concentrated by MnO_2-fiber,then both isotopesare determined through emanation of MnO_2-fiber which adsorbed Ra isotopes and βcounting for￣(228)Ac,daughter of ￣(228)Ra, respectively, Examination with various waters such as river-water, sea -water,ground -water and well-water etc.,it is showed that this method is sensitive,reliable,simple and easyto operate. The methods are feasible for measurement of low level￣(226)Ra,￣(228) Ra in natural waters.国家教委博士学科点专项科研基金和厦门市海洋管理处海洋研究开发基