The radiolysis of phenylalanine, tyrosine and dopa (dihydroxyphenylalanine) in water, of phenyalanine and tyrosine in 0.5 N hydrochloric acid and of phenylalanine in 0.5 N sulfuric acid have been studied using carbon-14 labeled compounds. Phenylalanine formed tyrosine, tyramine, dopa and phenylpyruvic acid, while tyrosine afforded dopa, dopamine and p-hydroxyphenylpyruvic acid. The final product in all cases was an insoluble polymer. A linear relation was found between log <tex-math>$G_{-M}$</tex-math> and the absorbed dose, and the relative rate constants for radiolysis were obtained.

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