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在中子诱发铀裂变产生稀土元素裂变产额的测量和乏燃料中稀土元素的分析中,大量铀中痕量稀土元素的分离都具有重要的意义。本研究采用氟化钙共沉淀法从克量级铀中分离痕量稀土元素。具体操作步骤如下:在烧杯中加入2 g U3O8和152Eu指示剂,加入浓硝酸,在电炉上加热溶解,蒸干,用稀硝酸转移到50 mL离心管中,加入2 mL浓HF,20 mg Ca载体,搅拌均匀,热水浴陈化15 min,冷却,离心,弃清液;1%HF洗涤沉淀两次,离心,弃清液;用6 mol/L HCl和少量H3BO3
In the measurement of rare earth element fission yield induced by neutron-induced uranium fission and the analysis of rare earth element in spent fuel, the separation of trace rare earth elements in a large amount of uranium is of great significance. In this study, trace amounts of rare earth elements were separated from gram-sized uranium by calcium fluoride coprecipitation. Specific steps are as follows: Add 2 g U3O8 and 152Eu indicator in a beaker, add concentrated nitric acid, heated and dissolved in an electric furnace, evaporated to dryness, transferred to a 50 mL centrifuge tube with dilute nitric acid, add 2 mL of concentrated HF, 20 mg Ca Carrier, stir, hot water bath aging 15 min, cooled, centrifuged, the supernatant was discarded; 1% HF washing precipitate twice, centrifuged, the supernatant; with 6 mol / L HCl and a small amount of H3BO3