A combination of neutron activation and mass spectrometry has been used to determine the concentrations of fissiogenic 1291 and stable lZ7I in thyroids of grazing animals and in mineral iodine. The 1291/1z71 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 lZ9I levels of cows and deer. Values of the 1291/1271 ratio in deer appear to vary inversely with the iodine concentration of the thyroid.
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