【摘要】 因加速器质谱法（ＡＭＳ）测定７９Ｓｅ半衰期的需要，建立了一个从裂变产物中放化分离７９Ｓｅ的新流程。流程以硝基苯萃取－二氧化硫沉淀为主要步骤，避免了经典的ＳｅＢｒ４蒸馏法带来的７９Ｂｒ对７９Ｓｅ的同量素污染。流程的化学回收率大于６０％，对所要分离的各种放射性核素的去污能力满足要求。采用液闪方法测量７９Ｓｅ的放射性活度，并对影响活度测量的各种因素进行了详细的研究。用本流程获得的７９Ｓｅ可成功地用于其半衰期的测量工作中。更多还原

【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.更多还原