Chemical Changes in the Chloroform-Paraffin-Dye System Irradiated with 60Co γ-rays. II. Formation of Hydrogen Chloride and Absorption Energy in the Solid

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Studies have been carried Out on the amount of hydrogen chloride formed by the radiolysis of chloroform in a solid paraffin-chloroform-Methyl Yellow system, and the color changes from yellow to red and absorption energy observed. The amount of hydrogen chloride formed and the intensity of the red color were determined with a pH meter, a spectrophotometer, and a color/ color-difference meter. It was found that the color-difference meter had the most excellent spectral response and sensitivity for measurement of the irradiated sample, and that the colordifference, ΔE, obtained by reflectometry increased proportionally with the increase in the radiation dose throughout a region of 100-5000 R. When a solid sample composed of 1.0 kg paraffin (m.p. 62-64℃), 0.74 kg chloroform and 3.4 × 10^<-3> mol Methyl Yellow was subjected to 1000 R irradiation at 20℃, 2.5 × 10^<14> molecules of hydrogen chloride were formed in 1.0 g of the solid sample with the absorption energy of 5.9 × 10^<16> eV, 3.2 × 10^<16> eV of which contributed to chloroform as the absorption energy.
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