Letter | Published:

A Direct-Plating Method for the Precise Assay of Carbon-14 in Small Liquid Samples


WHEN aqueous solutions containing carbon-14 compounds are dried on planchettes for assay under an end-window counter, surface tension often makes it difficult to ensure that the solids are deposited in a layer sufficiently uniform to give reproducible self-absorption and counter geometry. The essential feature of the present method is that the compound to be assayed is incorporated in a layer of gel which will dry to a perfectly even film.

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    Reinhold, L., and Powell, R. G., J. Exp. Bot., 9, 82 (1958).

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