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A st udy is r eported of t he detennina t,ion of car bon-1 4 in CH-Iabeled su bstances by co unt ing, wi th a proport ional gas-flow co unter, t h E' r adioact ive disintegrations ari sing from a m ateri al t hat is dissolved in a s uitable solv cnt. A number of solvent.s were found to bc sat isfactor y . Form amide is recomm ended for t hc assay of carbohydr9.tes a nd other m aterials wi th which it is a comp atibl e solvent. Eth.vlene glycol is sui table for the assay of highl y alkali ne substances, a nd, in co nj unct ion with sequestering age nts, for t he assay of a lk a linc car th car bonates. Other useful sol vent s are dim ethyl fo rm amide and 90-pcrce nt phosphoric acid . T he co unt ing effi ciency in diffarent solvents was found to be inversely p roport ional to th e density of t he solu tion a nd highly reprod ucible. The st ud y sh ows that solu tions of CI4-labeled m aterials can be co unted easil y and prec ise!.v with a proport iona l counter.

Determination of carbon-14 in solutions of C+14-labeled materials by means of a proportional counter