engleski

Rapid determination of 55Fe and 89, 90Sr in liqud samples

In a last decade significant progress in the methods development for alpha, beta-emitting radionuclide determination was made. This progress is based on the development of new procedures for chemical isolation and separation of specific radionuclides and new generation of liquid scintillation spectrometer, which enables rapid determination of low-level activity(1-4). The procedures for chemical isolation and separation are mainly based on development of new extraction chromatographic resin and ion chromatographic separation (1-3). Therefore new advance in separations of specific radionuclide from liquid samples and their determination by liquid scintillation spectrometry will be showed. By combination of extraction chromatography on TRU and Sr.spec resin and ion exchange chromatography a new procedures for separation of 55Fe and 89, 90Sr from radioactive liquid waste and seawater samples can be obtained. The procedures include sample concentration on cation or anion exchanger, separation of Fe from other elements on TRU column by HCl and HNO3 as eluents, separtion of strontium on Sr.spec column by HNO3 or by separtion of strontium and yttrium on anion exchange column with alcoholic soluion of nitric acid (5). 55Fe can be determined by liquid scintillation counting or by x-ray spectrometry and 89, 90Sr can be determined by Cherenkov counting immediately after seperation(6). In a paper complete procedure for 55Fe and 89, 90Sr determination in liquid waste and seawater samples will be described. Special attention will be given to detection and determination of 55Fe on x-ray spectrometer and rapid determination of 89, 90Sr by Cherenkov counting

55Fe; 89; 90Sr determination; ion chromatographic separation; low-level radioactive liquid waste; seawater; Cherenkov counting

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