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Uptake of 67Ga in the lactating breast and its persistence in milk: case report.

The concentration of 67Ga in the milk of a postpartum woman was measured at intervals up to 8 days after the injection of 3 mCi of 67Ga-citrate. The 67Ga concentration was about 0.15 muCi/ml at 3 days after injection and fell to 0.035 muCi/ml by 8 days. Since the biologic clearance of gallium was slow (T1/2 approximately 9 days), the major determinant of the clearance of radioactivity was the physical decay of the gallium. An estimate of the radiation dose to a nursing infant suggests that nursing be interrupted for about 2 weeks after the mother has had a 67Ga study.