Emergency management officials in Delaware say about 1,500 doses of potassium iodide have been distributed to residents who live within 10 miles of the Salem/Hope Creek nuclear power plant in New Jersey.
The pills were distributed Wednesday at the volunteer fire department in Middletown. They can protect the thyroid gland from radioactive iodine, which a plant may release in an emergency.
The tablets are distributed annually in the fall. But officials set up a second distribution after the earthquake and tsunami in Japan, which damaged one of Japan's nuclear power plants and resulted in radiation leaks.
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More than 39,000 people in Delaware live or work within 10 miles of the plant.
The tablets are good for five to seven years.