Iodine concentrations in bile, serum, and urine were determined by fluorescent excitation analysis using Americium-241 as the excitation source. The number of characteristic photons produced by the interaction of the exciting radiation with the iodine K-shell elecrons was directly related to concentration of iodine in the unknown sample. This method measured total iodine concentration directly in mg/ml and was accurate to ± 2% over an iodine concentration range of .2 to 50 mg/ml. This method does not require the purchase, handling, or disposal of radioactive material.
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Moss et al. (1972) studied this question.