TOKYO—Tokyo on Wednesday warned that radioactive iodine over twice the safe level for infants had been detected in its tap water due to the disaster at a quake-hit nuclear plant northeast of Japan’s capital.
The revelation came after a US bar on imports of dairy and other produce from areas near the crippled Fukushima power station following the natural disaster, which Japan’s government said could cost more than $300 billion.
The confirmed death toll from the earthquake and tsunami that battered Japan’s northeast coast on March 11 rose to 9,452, and Japan holds out little hope for 14,715 officially listed as missing.
Japan has already banned farm produce from areas near the charred plant, which has been belching radiation and has suffered a series of explosions and fires since Japan’s worst natural disaster in nearly a century.
France urged the European Union to also control Japanese food imports due to the emergency at the Pacific coast plant, where engineers are battling to prevent a meltdown in overheating reactors.
In one Tokyo ward, a water sample contained 210 becquerels of iodine per kilogram, a city official said. That is more than double Japan’s legal limit. Tokyo’s stock market dived 1.6 percent on the news.
The government advised residents throughout the city to avoid using tap water to make infant milk formula until further notice.
Prime Minister Naoto Kan stopped shipments of untreated milk and vegetables including broccoli, cabbage and parsley from areas near the plant, about 250 kilometres (155 miles) northeast of Tokyo.
Farm produce shipments were halted from Fukushima and three nearby prefectures—Ibaraki, Tochigi and Gunma—while radiation monitoring of farm and seafood products was stepped up in six others, officials said.
The new inspection zone extends to Saitama and Chiba, part of the greater Tokyo urban sprawl that is home to more than 30 million people.
The health ministry said radioactivity drastically exceeding legal limits had been found in 11 kinds of vegetable grown in Fukushima.
Radioactive caesium at 82,000 becquerels—164 times the legal limit—was detected in one type of leaf vegetable, it said.
The ministry said that if people eat 100 grams (four ounces) a day of the vegetable for about 10 days, they would ingest half the amount of radiation typically received from the natural environment in a year.
“Even if these foods are temporarily eaten, there is no health hazard,” said top government spokesman Yukio Edano, following reports that some products may have already entered the market.
“But unfortunately, as the situation is expected to last for the long term, we are asking that shipments stop at an early stage, and it is desirable to avoid intake of the foods as much as possible.”
Even if the short-term risk is limited for now, scientists pointing to the 1986 Chernobyl disaster warn that some radioactive particles concentrate as they travel up the food chain and stay in the environment for decades.
The US Food and Drug Administration said it had placed an import alert on all milk, dairy products, fresh vegetables and fruits from four Japanese prefectures.
“In addition, FDA will continue to flag all entries from Japan in order to determine whether they originated from the affected area,” it said. “FDA will test all food and feed shipments from the affected area.”
South Korea also said it was considering a food import ban.
Around Asia, many Japanese restaurants and shops are reporting a decline in business, and governments have stepped up radiation checks on the country’s goods. Tainted fava beans from Japan have already cropped up in Taiwan.
In Japan, any further food shortages threaten to compound the misery for hundreds of thousands made homeless by the 9.0-magnitude quake and the jet-speed tsunami it spawned that erased entire communities.
Japan estimated the disaster’s economic cost at up to 25 trillion yen ($309 billion) — more than twice that inflicted by the 1995 Kobe quake. The World Bank has said Japan needs up to five years to rebuild.
As grieving survivors huddled in evacuation shelters amid the rubble of their former lives, their fate was overshadowed by the struggle to avert another massive catastrophe — a full nuclear meltdown at Fukushima.
Engineers hope to restart the cooling systems of all six reactors that were knocked out by the 14-metre (46-foot) tsunami, and they have already reconnected the wider facility to the national power grid.
But workers were evacuated on Wednesday from part of the site after dark smoke rose from one of the reactors, said plant operator Tokyo Electric Power Co.