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  • 1 Institute of Isotopes of the Hungarian Academy of Sciences P.O.Box 77 H-1525 Budapest Hungary
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A simple potentiometric method for determination of specific activity of carrier-free125I (NaI) has been elaborated. The method is based on the measurement of tracer amounts of iodide present in the125I preparate, by using an ion-selective membrane electrode. The method presented is suitable in practice for rapid estimation of specific activity of carrier-free125I preparation in cases where the knowledge of its numerical value is necessary.