Abstract
An apparatus for the photo-synthetic growth of algae in an atmosphere of C14O2 has been described. The 2 factors involved in the production of high activity algae appear to be the avoidance of a high initial concentration of CO2, and the use of an isotopic ratio of about 10% or less. Using the procedure and apparatus described, C14 labeled algae with an activity of the order of 100 [mu]g/mg and with a high probability of random labeling have been prepared.

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