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A scintillation counter for carbon-14, which uses solution phosphors, has been described. This instrument has been used to measure the activity ratio of a pair of carbon-14-containing solutions with an average deviation of approximately 0.5% from the mean and from the calculated value. It employs automatic alternate counting of three cells, one of which is usually a standard and one a background. The alternating feature was designed to reduce possible effects of instrument drift and changing background on the results from long counting periods. A series of experiments to test this feature is reported. The counter is simple, electronically. The mechanical parts are not difficult nor expensive to build where adequate shop facilities are available.

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