Many nuclear power plants (NPP) facilities have aged and are being dismantled around the world. As a result, large amounts of radioactive metal waste are generated during decommissioning. Carbon steel, stainless steel, and Inconel are the most common metals used in NPP, and radioactive contaminants are mostly accumulated in the corrosion layer. There are various radionuclides, but the main ones are ⁶⁰Co, ¹³⁷Cs, ⁵⁴Mn and ⁵¹Cr. ⁶⁰Co is the major activated corrosion product and responsible for high gamma radiation and longer half-life (5.27 years.) also makes it the most difficult to remove. Therefore, we investigated the melt decontamination characteristics of ⁶⁰Co by introducing various slags using induction melting for stainless steel and carbon steel. Cobalt plating and cobalt oxide film coatings were used as specimens instead for safety purposes. The amount of cobalt removed from the slag was analyzed by using XRF. About 11% of the cobalt was removed from the contaminated metal due to slag oxide formation. The distribution of cobalt in the melted metal was also almost homogeneous according to the XRD analysis.

中文翻译：

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感应熔炼不锈钢和碳钢熔体去污实验研究

世界各地的许多核电站 (NPP) 设施已经老化并正在拆除。因此，在退役过程中会产生大量放射性金属废物。碳钢、不锈钢和因科镍合金是核电厂最常用的金属，放射性污染物大多积聚在腐蚀层中。有多种放射性核素，但主要是⁶⁰ Co、¹³⁷ Cs、⁵⁴ Mn 和⁵¹ Cr。⁶⁰ Co 是主要的活化腐蚀产物，导致高伽马辐射和更长的半衰期（5.27 年）。也使其最难去除。因此，我们研究了⁶⁰Co 通过感应熔炼不锈钢和碳钢引入各种炉渣。出于安全目的，使用镀钴和氧化钴薄膜涂层作为样品。使用 XRF 分析从炉渣中去除的钴量。由于氧化渣的形成，大约 11% 的钴从受污染的金属中去除。根据 XRD 分析，钴在熔化金属中的分布也几乎是均匀的。