Abstract

Radiation internal absorbed doses to seven organs are calculated for adrenal imaging radiopharmaceuticals, 19-iodocholestrol and 6-iodomethylnorcholesterol labeled with 131I or 123I, from published biological distribution data of the 125I-labeled compounds of greater than 98% chemical purity. Consideration of the biological distribution, dosimetry and physical data indicates that 123I-6-iodomethylnorcholesterol is preferred for adrenal scintigraphy.

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