Abstract: A NEW RADIOCHEMICAL PROCEDURE FOR SEPARATING 79Se FROM FISSION PRODUCTSLi Chunsheng Guo Jingru Li Daming Sun Hongqing Cui Anzhi(China Institute of Atomic Energy,P.O.Box 27526,Beijing 102413)ABSTRACTA radiochemical procedure for separation of 79Se from fission products with the main steps of nitrobenzene extraction and sulfur dioxide precipitation is presented.The procedure gives a chemical yield of selenium greater than 60% and has a satisfactory decontamination ability from all of the relating radioactive nuclides.The mearurement conditions of 79Se radioactivity using liquid scintillation technique are studied.The 79Se samples obtained from the procedure have been used successfully for 79Se halflife determination.Key words 79Se Radiochemical separation Fission products Extraction Precipitation