Abstract
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.
