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A method has been developed for the preparation of oxygen comparison standards for charged particle activation analysis, particularly for the use of helium-3 as the activating particle, by anodic oxidation of tantalum foil. The isotopic composition of the oxide is varied by using isotopically enriched water in the electrolyte, which is 0.1 percent potassium chloride. The current passing through the cell is held constant at 40 mA while the voltage is allowed to vary. The thickness of the oxide film produced is a smooth function of time and is reproducible to within a few percent. Oxide I 2 films have been produced which vary in thickness from 0.5 mg/cm for a 1 min ,2 anodization, to over 35 mg/cm for an anodization time of 3 hours. The uniformi ty of the anodi.zed foil and the oxygen content have been verified by . I helium-3 activation analysis. Standards for activation analysis may be made by this method which will reproduce any beam degradation in a sample from negligible energy loss to the complete stopping of a 10-MeV heliurri-3 beam. These standards have been used for isotopic oxygen analysis of several materials and for measuring excitation functions for the production of 19o 2 °F from 1 · o and fo:i' production of 18F, 15o, c, and 17 F plus o from 160. and

Preparation of isotopic oxygen targets for charged particle activation analysis