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論文

Thorium oxide dissolution in HNO$$_{3}$$-HF mixture; Kinetics and mechanism

Simonnet, M.; Barr$'e$, N.*; Drot, R.*; Le Naour, C.*; Sladkov, V.*; Delpech, S.*

Radiochimica Acta, 107(4), p.289 - 297, 2019/04

 パーセンタイル:100(Chemistry, Inorganic & Nuclear)

This paper is an attempt to find out thorium oxide dissolution mechanism in HNO$$_{3}$$-HF mixture. In a previous paper, several parameters effects on thorium oxide dissolution have been described, with specific focus on hydrofluoric acid effect, which can lead to an increase of the dissolution rate if present in small amount, but precipitates as ThF$$_{4}$$ at higher content. Based on this previous study, experimental data were fitted using several dissolution models in order to find out the best one. Finally, a revisited model based on literature and considering the ThF$$_{4}$$ formation was proposed. It describes the main steps of dissolution and is able to fit the experimental data for a wide range of solution compositions. This point is crucial since it allows considering an extrapolation of the established model to not-yet-studied conditions.

口頭

Constraining the Quaternary evolution of the Hida range of the Japanese Alps

King, G.*; 末岡 茂; 塚本 すみ子*; Biswas, R.*; Herman, F.*; Ahadi, F.*; Gautheron, C.*; Delpech, G.*; 田上 高広*

no journal, , 

閉鎖温度が極めて低い熱年代手法(光ルミネッセンス法, 電子スピン共鳴法)を用いて、第四紀における飛騨山脈の削剥史の復元を試みた。いずれの測定結果からも、第四紀における急激な冷却・削剥が推定された。60$$^{circ}$$C/kmの地温勾配を仮定すると、削剥速度は、MIS4では約10mm/yrだったのが、最近2万年間では約1-3mm/yrに減少した可能性がある。

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