Estimation of Yields of OH Radicals in Water Irradiated by Ionizing Radiation

0301 basic medicine Kinetics 03 medical and health sciences 0302 clinical medicine Models, Chemical Hydroxyl Radical Radiation, Ionizing Water Computer Simulation Dose-Response Relationship, Radiation Linear Energy Transfer Radiation Dosage 7. Clean energy
DOI: 10.1269/jrr.46.333 Publication Date: 2005-10-06T05:55:58Z
ABSTRACT
The yield of OH radical induced by ionizing radiation was estimated by an empirical model; a prescribed diffusion model for a spur of single size applying to neutral water. Two representative spur distances were introduced, one for an incident primary charged particle and one for a representative secondary electron, to calculate chemical yields among active species in a spur. The total yield from the track was a combination of these primary and secondary yields. Two coefficients of this combination were the parameters of the present model. Based on an optimization of these parameters by existing experimental Fricke G-values, the present model estimates the yields of OH at the microsecond timescale after an irradiation, in a unified manner from electrons to heavy ions. The predicted yields of OH around the nanosecond timescale after an irradiation may be a relevant basis for a study on the mechanisms of radiation effects. This prediction by the present model was exemplified for electrons, photons and heavy ions (proton, helium, carbon, neon, argon and iron).
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