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Pediatric Terrorism and Disaster Preparedness

Public Health Emergency Preparedness

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Table 6.9. Threshold Radioactive Exposures and Recommended Prophylactic Single Doses of KI

Patients by Age/Sex Predicted Thyroid
Exposure (Gy)
KI Dose (mg) No. of 130-mg
No. of 65-mg
>40 yr old
≥5 130 1 2
18-40 yr
≥0.1 130 1 2
Pregnant or lactating women ≥0.05 130 1 2
Adolescents 12-18 yr old ≥0.05 130 1 2
3-12 yr old
≥0.05 >65 1/2 1
1 mo to 3 yr old
≥0.05 32 1/4 1/2
birth to 1 mo old
≥0.05 16 1/8 1/4

Source: Adapted from U.S. Department of Health and Human Services, Food and Drug Administration (FDA), Center for Drug Evaluation and Research. Potassium Iodide as a Thyroid Blocking Agent in Radiation Emergencies. Available at

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