Abstract
A liquid scintillation technique for counting total plasma or serum activity of C14 and H3 is described. The serum is complexed by the quaternary ammonium base, Hyamine, and dissolved in phosphor-containing toluene with the addition of ethanol. Correction for quenching is effected by recounting an added internal standard after determination of the observed count. The method is rapid and accurate for various volumes of serum.

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