Abstract
Doses from intravenous intakes of 59Fe or 57Co chloride during pregnancy were estimated. Near term fetal organ doses were derived via the MIRDOSE3 newborn phantom, with mean dose/cumulated activity (S) values rescaled for compatibility with near term fetus whole body S. A detailed in vivo biodistribution database provided indications of residence times in important maternal and fetal organs. 59Fe doses to the fetus whole body from early to late pregnancy were 7-11 mGy MBq(-1) (8.5-14.3 mSv MBq(-1)), similar to that to the mother. Doses to near term fetal spleen (59 mGy MBq(-1)), liver (36), and red marrow (9) were similar or higher than to the mother. 57Co doses to fetus whole body from early to late pregnancy were 0.7-3.3 mGy MBq(-1) (2.5-8.2 mSv MBq(-1)), similar or higher than to the mother. Doses to near term fetal small intestine (34 mGy MBq(-1)). liver (4.7) and red marrow (2.7) were similar or higher than to the mother.
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