Varying amounts of radiation decomposition during storage i n the dry form have been found in the cases of ~k l a b e l e d valine, norvaline, norlewine, choline chloride, calcium glycolate and cholesterol, These data indicate t h a t investigators using labeled organic compounds should make frequent checks of the purity of these compoun8.s i n order t o exclude

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The spe•.::ifie :.St•rd:;:tvi ty was so low as to make these values insignificanto ** These rem:J.ts are ~~i2B average of three rat.s for eaeh compmmd.