The government found a slight amount of radioactive substances in breast milk of seven women in a survey covering 23 women in five prefectures including Tokyo and Fukushima, a news report said Saturday, reported dpa.
The amount was below the interim limits for milk and dairy products under the Food Sanitation Law and poses no health risks to babies, Kyodo News agency reported citing Japan's health ministry.
Tokyo Electric Power Co's Fukushima Daiichi nuclear plant was damaged by a magnitude-9 earthquake and tsunami on March 11 and has leaked radiation into the air and sea ever since.
Several kinds of vegetables, fish and raw milk from areas near the plant have been already banned due to high levels of radiation detected in their samples.