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Ballad R. V.; Holman, D. W.; Hennecke, E. W.; Johnson, J. E.; Manuel, O. K.; Nicholson, L. M.
Health Physics: April 1976
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A combination of neutron activation and mass spectrometry has been used to determine the concentrations of fissiogenic 129I and stable 127I in thyroids of grazing animals and in mineral iodine. The 129I/127I ratios are lowest in mineral iodine and in a given area lower in cow thyroids than in deer thyroids. Near saturation levels of mineral iodine in commercial feeds and salt licks may account for differences in the 129I levels of cows and deer. Values of the 129I/127I ratio in deer appear to vary inversely with the iodine concentration of the thyroid.

©1976Health Physics Society