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Epithermal instrumental neutron activation analysis of biological reference materials for iodine

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Abstract

Epithermal instrumental neutron activation analysis (EINAA) methods have been optimized and applied to several biological reference materials and selected food items for the determination of iodine. The method involves irradiation of the samples for different periods in epi-cadmium and/or epi-boron flux of the Dalhousie University SLOWPOKE-2 reactor and direct counting without any pre-treatment on a 25-cm3 hyperpure Ge detector. The 443 keV photopeak of 128I is used for assaying the iodine content. Precision of measurements, expressed as the relative standard deviation, is 10–15% at 200–500 ppb and 3–12% at 500–6000 ppb levels of iodine. Accuracy of iodine measurements is within 5%. The detection limits for iodine in several biological materials with cadmium and boron, either alone or a combination of the two, as thermal neutron shields have been found to vary between 0.1 and 0.4 mg · kg−1 for different periods of irradiation, decay and counting. The results suggest that the EINAA methods can be successfully applied to biological materials for routine analysis of iodine at levels higher than 200 ppb.

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Rao, R.R., Holzbecher, J. & Chatt, A. Epithermal instrumental neutron activation analysis of biological reference materials for iodine. Fresenius J Anal Chem 352, 53–57 (1995). https://doi.org/10.1007/BF00322296

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  • DOI: https://doi.org/10.1007/BF00322296

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