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Whole-Body Retention of ⁶⁷Ga-Citrate

Oak Ridge Associated Universities, Oak Ridge, Tennessee

Correspondence: For reprints contact: Evelyn E. watson, Medical Div., Oak Ridge Associated Universities, P.O. Box 117, Oak Ridge, Tenn. 37830.

ABSTRACT

The retention of ⁶⁷Ga-citrate in patients with neoplastic diseases was measured with a whole body counter which has a counting efficiency essentially independent of patient size and radionuclide distribution. From 2 to 5 mCi of ⁶⁷Ga-citrate were administered to each patient. Stable gallium constituted <3 µg/dose. The whole-body counting results were analyzed to determine whether differences in uptake and retention could be related to sex or age of the patients. Although there was great variation among patients, biological half-time of the ⁶⁷Ga was longer in the females than the half-time in the males. No significant differences could be shown to relate to the patients' ages.