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  • Title: A simple method to quantitate iodine-124 contamination in iodine-123 radiopharmaceuticals.
    Author: Palmer DW, Rao SA.
    Journal: J Nucl Med; 1985 Aug; 26(8):936-40. PubMed ID: 4032037.
    Abstract:
    Iodine-123 (123I) produced by the 124Te(p,2n)123I reaction contains several percent 124I radionuclidic contamination at the time of imaging. Since 124I degrades the quality of the images and causes unnecessary radiation absorbed dose to the patient, it is important to know the amount present in radiopharmaceuticals at the time of administration. A simple approach is described which uses a radionuclide dose calibrator and lead shield. The sample is assayed both shielded and unshielded and the ratio of readings depends uniquely upon the percent 124I present. The technique can be adopted for any type of dose calibrator, sample container, and Pb shield, but use of the numeric constants reported here should be restricted to the specified equipment.
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