Concentration and Incident Energy Dependences of Transient Species in Water by H+ Ion Irradiation
Concentration and Incident Energy Dependences of Transient Species in Water by H+ Ion Irradiation
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H 离子辐照水中瞬态物质的浓度和入射能量依赖性
DOI：
10.14723/tmrsj.36.329
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Y. Katsumura
中科院分区：
文献类型：
--
作者：
K. Iwamatsu;M. Taguchi;Y. Sugo;S. Kurashima;Y. Katsumura
用能量为20 MeV的脉冲H离子辐照NaBr水溶液，得到了瞬态物种Br 2的浓度和入射能量的依赖关系。在375 nm处用瞬态吸收法观察Br 2的生成和分解。采用GAF薄膜剂量计对辐照脉冲剂量进行了定量分析。Br 2的形成率从0.73略微增加到0.85（每100 eV吸收能量的反应物种数）随着NaBr浓度从1增加到1000 mM。对于1000 mM NaBr水溶液，随着入射能量从19.4降低到8.8 MeV，Br 2的形成产率从0.85降低到0.27，换句话说，LET值从4.79增加到8.81eV/nm。
The concentration and incident energy dependence of transient species Br2 were obtained for aqueous NaBr solutions irradiated with pulsed H ion with energies of 20 MeV. The formation and decomposition of Br2 were observed by transient absorbance method at 375 nm. Dose in irradiation pulse was evaluated by using GAF film dosimeter for the quantitative analysis of reactive species. The formation yield of Br2 slightly increased from 0.73 to 0.85 (number of reactive species per absorbed energy of 100 eV) with the increase in the concentration of NaBr from 1 to 1000 mM. The formation yield of Br2 for 1000 mM NaBr aqueous solution decreased from 0.85 to 0.27 with the decrease in the incident energy from 19.4 to 8.8 MeV, in other words, the increase in LET value from 4.79 to 8.81 eV/nm.