新丰中子核素^（185）Hf的研究Ⅱ．合成和鉴别中的快放射化学分离

STUDY OF NEW NEUTRON-RICH NUCLIDE ￣(185)Hf Ⅱ.THE RAPID-CHEMICAL SEPARATION STUDY ON THE SYNTHESIS AND IDENTIFICATION

介绍了在新丰中子核素￣（１８５）Ｈｆ合成和鉴别过程中快放射化学分离流程的研制和实验。用沉淀剂使Ｈｆ生成ＢａＨｆＦ＿６沉淀而与大量的靶物质钨及其他伴随产物分离，所得沉淀制源后，测其γ放射性。整个流程典型分离时间约６－７ｍｉｎ，化学回收率约５３％，去污系数完全满足新丰中子核素￣（１８５）Ｈｆ的合成和鉴别的要求。

The development and experiment of rapid-chemical separation procedure on the synthesisand identification of new neutron-rich nuclide ￣(185)Hf are reported.Hafnium is precipitated in theform of BaHfF_6 ,then is seperated from tangsten,tantalum and other reaction products. The pre-cipitate is used as a source to be measured to obtain its γ-ray spectroscopy. The typical separation time of this procedure is about 6-7min and the chemical efficiency is53%. Contamination activities of Ta and W have been reduced to 5%and 8%,respectively.