Minerals, Volume 10, Issue 9 (September 2020) – 109 articles
Cover Story (view full-size image): 226Ra is an important contributor to naturally occurring radioactive materials (NORM) and also relevant in some safety cases related to the disposal of spent nuclear fuel in a deep geological repository. Recrystallization and solid solution formation with sulfates are regarded as an important retention mechanism for 226Ra. Here, we have investigated the (Ba,Sr)SO4 solid solution at the Ba-rich end with regard to the 226Ra uptake kinetics and solubility. It is remarkable how already low amounts of Sr have an impact on the 226Ra solubility and the recrystallization kinetics of the solid solution–aqueous solution system (Ba,Sr,Ra)SO4 + H2O. The experimental findings confirm a theoretically predicted minimum of the 226Ra solubility in this system that is lower than that in the (Ba,Ra)SO4 binary solid solution. View this paper
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