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Journal Articles

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

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

Geochimica et Cosmochimica Acta, 74(12), p.3553 - 3570, 2010/06

https://doi.org/10.1016/j.gca.2010.03.018
 Times Cited Count：132 Percentile：92.88(Geochemistry & Geophysics)

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.

Oral presentation

Ra interaction with Ca/Ba mineral in bentonite

Fujiwara, Kenso; Tomura, Tsutomu*; Tobita, Minoru*; Tits, J.*; Curti, E.*

no journal, , 

Ra-226 is a safety-relevant radionuclide in performance assessments of high-level waste repositories and has thus been deserved special attention. The aim of the proposed study is to provide new key data on the interaction of Ra with calcite and witherite. In this study, the interaction of Ca with calcite and Ba with witherite was measured by using Ca-45 and Ba-133.

Oral presentation

Evaluation of Ra migration influenced by coprecipitation with Ca/Ba mineral in bentonite, 2

Fujiwara, Kenso; Tomura, Tsutomu*; Tobita, Minoru*; Suzuki, Yasuyuki*; Tits, J.*; Curti, E.*

no journal, , 

The aim of the proposed study is to provide new key data on the interaction of Ra with calcite, witherite and barite in the presence of selected clay materials Kunigel V1 bentonite representing the backfill, respectively host-rock, of the high-level waste repositories planned in Japan.

Oral presentation

Evaluation of Ra migration influenced by coprecipitation with Ca/Ba mineral in bentonite, 3

Fujiwara, Kenso; Iijima, Kazuki; Tomura, Tsutomu*; Tobita, Minoru*; Suzuki, Yasuyuki*; Tits, J.*; Curti, E.*

no journal, , 

no abstracts in English

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