Abstract Four methods for 90Sr separation from spent ion-exchange resin samples were carried out, offering a useful methodology to achieve interferences free 90Sr fractions. The four methods consist in resin sample decomposition, pre-treatment and selective separation of 90Sr by using: (a) a single chromatographic extraction process, (b) double chromatographic extraction, (c) a single chromatographic extraction process followed in sequence by two precipitations, and (d) ion-exchange chromatography, followed by extraction chromatography and precipitation. Mineralization by microwave acid digestion and the four 90Sr separation methods thoroughly presented are available. Data processing methods (adjustable modified efficiency tracing – a new improved approach for the efficiency tracing LSC technique, non-linear regression and α-β discrimination) to obtain the activities values of α, β-γ, pure β emitters and the evaluation of chemical recovery yield of strontium were presented. A discussion about activity assessment in 90Sr purified fractions, providing a convincing argument to support the accuracy of the 90Sr separation methods, is also offered.

中文翻译：

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从离子交换树脂放射性废物中分离和定量 90Sr：分析方法和技术

摘要 研究了四种从废离子交换树脂样品中分离 90Sr 的方法，为获得无干扰的 90Sr 馏分提供了一种有用的方法。这四种方法包括树脂样品分解、预处理和 90Sr 的选择性分离，使用：(a) 单次色谱提取过程，(b) 双次色谱提取，(c) 一次色谱提取过程，然后依次进行两次沉淀(d) 离子交换层析，然后是萃取层析和沉淀。可以使用微波酸消解矿化和完整介绍的四种 90Sr 分离方法。数据处理方法（可调修正效率追踪——效率追踪LSC技术的一种新改进方法，非线性回归和α-β判别）获得α、β-γ、纯β发射体的活度值和锶化学回收率的评价。还讨论了 90Sr 纯化馏分的活性评估，为支持 90Sr 分离方法的准确性提供了令人信服的论据。