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UV spectra of gamma-irradiated Ca(ClO4)2 in an aqueous pH 9 buffered solution (20°C). ɛmax=360 nm for ClO2 (g), and ɛmax=290 nm for ClO− (aq). A decrease absorbance at 360 nm occurs due to the loss of ClO2 (g) from solution. Only residual levels of ClO2 (g) remain in samples heated to 160°C (unheated: • 0 min; ▴ 40 min;+80 min; ▪ 120 min; heated: 
0 min; 
40 min; 
120 min).
