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Radium uptake during barite recrystallization at 23 $$pm$$ 2$$^{circ}$$C as a function of solution composition; An Experimental $$^{133}$$Ba and $$^{226}$$Ra tracer study

$$^{133}$$Baと$$^{226}$$Raのトレーサを用いた23$$pm$$2$$^{circ}$$Cで溶液条件を変化させたバライトの再結晶化とラジウムの取り込み試験

Curti, E.*; 藤原 健壮 ; 飯島 和毅 ; Tits, J.*; Cuesta, C.*; 北村 暁  ; Glaus, M. A.*; M$"u$ller, W.*

Curti, E.*; Fujiwara, Kenso; Iijima, Kazuki; Tits, J.*; Cuesta, C.*; Kitamura, Akira; Glaus, M. A.*; M$"u$ller, W.*

$$^{133}$$Baと$$^{226}$$Raの収着試験を同じ溶液条件(温度や圧力, pHなど)のバライト懸濁液を用いて行った。$$^{133}$$Baを用いたバライトへの再結晶化の時間依存性を測定することにより、再結晶化率を算出することができた。試験期間で再結晶の反応がほぼ完全に収束し、トレーサが均一に分布していることが確認された。これらのことからこの固溶体についてはRaの取り込み現象を熱力学的に評価することが可能であった。

Uptake tests with $$^{133}$$Ba and $$^{226}$$Ra sorption experiments were carried out under the T, p and pH conditions and with the same aqueous solutions on barite suspensions. The $$^{133}$$Ba tests served to determine recrystallization rates, from which the amounts of barite recrystallized as a function of reaction time could be determined. They also showed that recrystallization was almost complete at the end of the experiments and that tracer distribution was homogeneous in the crystals, implying full thermodynamic equilibrium between solid and aqueous solution. With this information, it was possible to evaluate the Ra uptake experiments in terms of solid solution thermodynamics.

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パーセンタイル:93.04

分野:Geochemistry & Geophysics

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