Abstract
Standard zircon samples studied earlier by Hurley, Larsen, and Gottfried (1955) have been analyzed for helium by an isotopic dilution technique using He3 as a spike yielding an accuracy of about ± 3 pct. The quantity of helium obtained is about 15 pct higher than that obtained by earlier volumetric techniques. Alpha activity determinations agree closely with earlier work. Measurements on non‐metamict zircons from Ontario, Ceylon, and Oklahoma suggest that helium retentivity in excess of 80 pct is not unusual. Metamict zircons on the other hand may have retained only one per cent of radiogenic helium. Total irradiation is not the only factor in determining the quantity of helium retained. A helium age method is still possible under proper conditions.
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