RADIATION CHEMISTRY OF SOLUTIONS: II DOSE-RATE, ENERGY, AND TEMPERATURE DEPENDENCE OF A LEUCO TRIARYLMETHANE DOSIMETER SOLUTION

Abstract

The dose-rate, energy, and temperature dependence of the system l0−4 M 4,4′-(5-chloro-2-thenylidene)bis[N,N-dimethylaniline], l0−4 M ferrous ammonium sulphate, 0.1 M sodium chloride, and 7 × 10−3 M hydrochloric acid has been investigated. No energy dependence was observed in the range 0.16 to 2.0 Mev and no dose-rate dependence was observed in the range 4 to 230 rads/minute. However, with dose rates of 400 to 1200 rads/minute, postirradiation dye fading was observed. In the dosage range 0 to 1000 rads this fading is not extremely serious. The system is slightly temperature dependent at temperatures lower than 30 °C and markedly dependent at higher temperatures. Dye yields of samples irradiated at 30 °C were 10% higher than those of samples irradiated at 15° but 33% lower than those of samples irradiated at 45°.