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作 者:孙旺 潘建雄 周明胜[1] 孙启明 王彦博 SUN Wang;PAN Jianxiong;ZHOU Mingsheng;SUN Qiming;WANG Yanbo(Department of Engineering Physics,Tsinghua University,Beijing 100084,China)
出 处:《原子能科学技术》2022年第8期1714-1720,共7页Atomic Energy Science and Technology
摘 要:高丰度^(76)Ge同位素在基础物理研究、医用放射性同位素领域有广泛应用,^(76)Ge富集的高纯锗探测器可用于探测无中微子双β衰变。为实现^(76)Ge同位素的分离制备,本文以四氟化锗(GeF_(4))为介质,使用气体离心法开展研究。采用阶梯级联模型的计算结果表明,5轮分离可将^(76)Ge的丰度从天然丰度7.73%提升至90%以上。在21级阶梯级联实验平台上进行离心分离实验,调节流量、分流比等工况参数,制定分离流程,探索实验规律并优化实验方案。最终经过5轮分离,获得百克量级的丰度为94.21%的^(76)Ge同位素产品,为国产离心级联制备高丰度^(76)Ge产品及其工业化生产提供参考。^(76)Geisotope with high abundance is broadly applied in the fields of fundamental physics research and medical radionuclides,especially in the fabrication of high purity germanium detectors to detect neutrinoless double-βdecay.Numerous international research cooperation groups such as GERDA,LEGEND,MAJORANA DEMONSTRATOR and CDEX are committed to the work of detecting the 0νββdecay.According to public reports,long-term plans of these experimental projects show that more than tons of enriched^(76)Geis needed to fabricate HPGe detectors.In the field of radiopharmaceutical therapy,^(76)Gecan be used to produce several medical radionuclides,for instance,^(76)As,^(78)Se,^(74)Zn,^(73)Zn,^(62)Mn,^(63)Fe and^(71,72,73)Cu,through different nuclear reactions.These nuclides can be used in positron emission tomography(PET)and medical diagnosis.The separation methods of germanium isotopes mainly include electromagnetic method,low temperature distillation method and gas centrifugation method.High abundance^(76)Geisotope was produced successfully in the experiments carried out by scientists from Russia and USA in the past several decades.It is meaningful to carry out relevant work with the aim of producing^(76)Gewith the abundance higher than 90%domestically.In order to realize the separation and preparation of enriched^(76)Geisotope,the gas centrifugation method was applied in this paper with germanium tetrafluoride(GeF_(4))as processing gas.The calculation results based on the step cascade model indicate that the abundance of^(76)Gecan be enriched from natural abundance 7.73%to higher than 90%(96.52%)after five rounds of separation.The centrifugal separation experiment was carried out on the 21-stage step cascade experimental platform with 23 N_(0) machines and the feed stage is the 11th stage.The flow rate,cut and other operating parameters were adjusted and the separation process was formulated to optimize working conditions and separation effects.Furthermore,experimental rules were explored in order to optimize the sche
关 键 词:^(76)Ge同位素 气体离心法 离心级联
分 类 号:TL25.2[核科学技术—核燃料循环与材料]
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