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M. Nakashima, N. Nakashio, Y. Kameo, T. Fukui, M. Isobe, A. Ohtake, T. Wakui, T. Hirabayashi

Effects of basicity and FeO concentration on the retention of ¹³⁷Cs and ⁶⁰Co in slag made from non-metallic radioactive wastes

Simulated non-metallic wastes containing ⁶⁰Co, ¹³⁷Cs and ¹⁵²Eu were melted to examine the effects of basicity and FeO concentration on the retention of the radioactive nuclides in a resulting solidified product (Al₂O₃-CaO-FeO-SiO₂ quaternary slag). The retention of ⁶⁰Co was almost independent of chemical composition of slag. On the other hand, the retention of ¹³⁷Cs decreased with an increase of the basicity of slag, defined as a ratio of CaO to SiO₂ in wt. independent of FeO concentration. Energy dispersive X-ray fluorescence spectroscopic analysis and Mössbauer spectroscopic measurement were also conducted for the solidified product. Mössbauer spectra indicated that Fe²⁺ ions as well as Ca²⁺ ions existed as network modifying cations in a silicate network structure of slag. Referring to a structure model of silicate glasses, it is inferred that the retention of ¹³⁷Cs reflects differences in chemical properties between Ca²⁺ and Fe²⁺ in the internetwork region formed by modifying cations and anionic non-bridging oxygen.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 91, 01/2003
Pages: 045

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