Gamma-Radiolysis of Aqueous Boric Acid Solution

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概要

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• The γ-radiolysis of aqueous boric acid solutions of relatively high concentration has been studied. Boric acid significantly promotes hydrogen formation up to 10<SUP>-7</SUP> mo<I>l</I>m/<I>l</I> but does not increase oxygen and hydrogen peroxide to any appreciable extent. Since boric acid reacts at a relatively slow rate with species formed by the primary process of water radiolysis, when an effective scavenger for <I>e</I><SUP>-</SUP><SUB><I>aq</I></SUB> - the precursor of H<SUB>2</SUB> - such as NO<SUP>-</SUP><SUB>3</SUB> is present, boric acid has no effects upon the total yield of H<SUB>2</SUB> in the range of concentrations studied. However, the yields of other products of the radiolysis - H<SUB>2</SUB>O<SUB>2</SUB> and NO<SUP>-</SUP><SUB>2</SUB> -are significantly reduced at high concen-trations of boric acid when NO<SUP>-</SUP><SUB>3</SUB> is present.<BR>These results are explained by established reaction schemes for the radiolysis of aqueous solution. Based upon the behavior of NO<SUP>-</SUP><SUB>2</SUB> from nitrate solutions, it is suggested that <SUP>-</SUP><SUB>2</SUB> reacts with H<SUB>3</SUB>BO<SUB>3</SUB> or H<SUB>2</SUB>BO<SUB>3</SUB> radicals, the plausible reaction product from the reaction, <BR>H<SUB>3</SUB>BO<SUB>3</SUB> + OH → H<SUB>2</SUB>O + H<SUB>2</SUB>BO<SUB>3</SUB>.

• 一般社団法人 日本原子力学会の論文

著者

• Koike Mitsuru

  Japan Atomic Energy Research Institute

• TACHIKAWA Enzo

  Japan Atomic Energy Research Institute

• MATSUI Takao

  Faculty of Engineering, Chiba University

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