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Partition coefficient of Ra in gypsum
Authors:Y Yoshida  T Nakazawa  H Yoshikawa  T Nakanishi
Institution:(1) Inspection Development Corporation, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1112, Japan;(2) Mitsubishi Material Corporation, 1002-14, Mukohyama, Naka city, Ibaraki 311-0102, Japan;(3) Present address: Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1194, Japan;(4) Faculty of Science, Kanazawa University, Kakuma, Kanazawa city, Kanazawa 920-1192, Japan
Abstract:A partition coefficient (λ) for Ra in gypsum was determined from coprecipitation experiment using oversaturation method. The λ-value derived for Ra was: λ Ra = 0.32±0.15. Saturation state was estimated with the initial concentration of Ca and SO42− in an experiment of the present study. Saturation index was calculated to be (0.49±0.02). This value was similar to those corresponds to analogous case where slow precipitation rate was kept in coprecipitation experiment for Sr in gypsum. Therefore, derived λ-value is thought to describe partition of Ra and Ca in solid phase and solution under an equilibrium condition without the effect of kinetic of precipitation. Determined λ-value was compared with those of other alkaline elements in sulfate minerals. The derived λ-value is smaller than that of Ra in barite and is similar to those of Sr in gypsum. This trend agrees with mechanical understanding for the size effect against partition coefficient.
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