![]() ![]() Dietary iodine intakes in the caption of Figure 1 refers to intake of stable KI, not I-131.įigure 1.The higher the number on the y-axis the more dose is averted.Note that the y-axis is in arbitrary units of averted dose, not a specific dose.It is a conceptual graphic that should NOT be used clinically.Figure 1 below shows the effectiveness of thyroid blocking achieved by administering stable iodine at different times before (only at 1.2 hours) or various times after a 4-hours intake (inhalation) of I-131.Since the protective effect of a single dose of KI lasts approximately 24 hours, repeat KI administration may be indicated for some members of the public where contamination is continuing or ongoing.KI is even less effective at preventing radioiodine uptake by the thyroid if taken more than 12 hours of a time-limited contamination episode.If KI is taken more than 4 hours after inhalation of I-131, much less thyroid uptake of I-131 is blocked. ![]() ![]()
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