海水中^(224)Ra快速富集和测定的新方法

A New Method for Rapid Concentration and Determination of ^(224) Ra in Seawater

报道一种快速富集、测定海水中 2 2 4 Ra的新方法 .该法用 Mn O2 -纤维富集 60升海水中 2 2 4 Ra,用 2 2 0 Rn的连续射气闪烁计数法测 2 2 4 Ra的比活度 ,方法简便、快速、灵敏、准确 ,适合于船上等现场操作 ,已成功地应用于九龙江河口区和厦门湾水体中 2 2 4

A new method for rapid concentration and determination of 224 Ra in seawater was presented. 224 Ra was preconcentrated from seawater by adsorpting onto MnO 2 fiber. The specific activity of 224 Ra adsorpted on the fiber was determined by stripping its daughter, 220 Rn, directly from the fiber bundle by circulating a stream of N 2 through it and measuring the 220 Rn activity concurrenty. This method is simple,sensitive,accurate and suitable for field operations. It was successfully applied to the studies on the distribution and geochemical behavior of 224 Ra in the Jiulongjiang estuary and Xiamen Bay waters.