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Large-scale production of 131 I in a nuclear reactor, the gaseous nature of 131 I, and its selective uptake by the human thyroid gland, make this radioisotope a health hazard in the event of a nuclear accident. The maximum concentration of 131 I in drinking water has been set at 1 pCi/l. Human ingestion of 131 I through the grass-cow-milk pathway makes milk an environmentally significant matrix to be monitored for. In this paper, we report a simple and a rapid radiochemical procedure for the analysis of 131 I in water and milk samples. A quick single-step separation on anion-exchange resin concentrates radioiodine from large sample volumes. The resin is then directly counted in the cavity of a low-background well-type HPGe detector that has high counting efficiency for X-rays and low-energy γ-radiation. Chemical recovery is evaluated from the intensity of the 29.6 keV X-rays of the 129 I spike, and 131 I is assayed through the intensity of its 364.5 keV g-peak. The method's minimum detection limit is 0.5 pCi 131 I based on a 1 liter sample and a 200-minute count.
Journal of Radioanalytical and Nuclear Chemistry – Springer Journals
Published: May 1, 2003
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