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Biodistribution of free actinium-225 (225Ac) in BALB/c mice. Data were obtained at 5 min, 1 h, 4 h, 24 h, and 72 h after intravenous 225Ac injection. Values are expressed as % ID/g for the organs and blood and as the % ID for urine and feces. Values are shown as the mean ± SD (n = 4).
