Response of the Chlorobenzene-based Dosimetry Systems to Protons in the Energy Range 3-5,5 MeV

The radiation chemical yield, G(HCl), was evaluated for chlorobenzene-based dosimetry systems irradiated by low-energy protons (3 - 5.5 MeV) and 60Co gamma radiation under similar irradiation conditions. The irradiations were done with the Tandem Van de Graaff accelerator and the reference 60Co gamma source. Two dosimetry systems were used in the measurements: the ECB solutions containing 10 vol. % chlorobenzene in aqueous 96 vol. % ethanol, and the CET dosimetry system containing 10 vol. % chlorobenzene, 10 vol. % ethanol and 80 vol. % trimethylpentane. The results show that the values of radiation chemical yield of hydrochloric acid, G(HCl), values for protons are lower than those for gammas. With the decrease of proton energy, the linear energy transfer (LET) increases and the reduction of G(HCl) becomes more pronounced: from lower by 5% (5.5 MeV) to lower by 14% (3.0 MeV) for the ECB system and from lower by 5% (5.0 MeV) to lower by 8% (3.0 MeV) for the CET system. (author)