Abstract

During scintillation counting of labeled amino acids in hairs, brown- colored solutions were formed when the hairs were dissolved in Hyamine X-10. In order to see whether the quenching is related to the optical density of the solution, measurements with a Tri-Carb spectrometer were made on solutions of hair, phosphor, and H/sup 3/-leucine or S/sup 35/-cystine. The relation between quenching and density at 430 m was found to be linear up to 50% quenching for both labeled compounds. (D.L.C.)

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