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Stearic acid, galactose and ceramide digalactoside have been y-irradiated in the solid state . Decarboxylation of stearic acid readily occurs to produce heptadecane (G=6-4) and traces of hexadecane . For stearic acid -G is 11 . 5 and for galactose is 14 ; the values are the same in air and in vacuo .Ceramide digalactoside on irradiation gives small amounts of penta and tridecane (G -9 x 10-$) . The -G values for disappearance of the stearyl and palmityl moieties are 0. 17 and 0 . 13 respectively . There is also evidence for breakdown of the trans olefinic double bond of the sphingosyl residue . Scission of the P-glycosidic bond results in the formation of galactose (G=1 .9). For the galactose residues -G is 3 . 7 .

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