【摘要】 为了获得更精确的138Cs衰变数据,需要制备出放化纯的138Cs样品。以“两步延迟分离法”为基础,将抽气法与碘铋酸铯沉淀、硅钨酸铯沉淀法相结合,建立了从裂变产物中分离放化纯138Cs的分离流程。其化学回收率达(74±1)%,对主要γ核素的去污因子大于103,操作时间在60 min以内。更多还原

【Abstract】 A radiochemical pure ¹³⁸Cs solution must be isolated from fission products,for more precise decay data of short-life nuclide ¹³⁸Cs are abtained.Based on "twice delay separation method",an one-hour separation procedure for ¹³⁸Cs from fission products is designed and examined,which combined "deflation",Cs₃Bi₂I₉ precipitation and Cs₄(Si(W₃O₁₀)₄)precipitation.The chemical recovery of ¹³⁸Cs is about（74±1）%.The decontamination factors for main γ-emitters are higher than 1×10³ and no contamination is found.更多还原