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"The possibility of further radioactive leakage is heightening," a grim-faced Kan said in an address to the nation earlier in the day.
"We are making every effort to prevent the leak from spreading. I know that people are very worried but I would like to ask you to act calmly."
Levels of 400 millisieverts per hour had been recorded near the No. 4 reactor, the government said. Exposure to over 100 millisieverts a year is a level which can lead to cancer, according to the World Nuclear Association.
Lam Ching-wan, a chemical pathologist at the University of Hong Kong, said the blasts could expose the population to longer-term exposure to radiation, which can raise the risk of thyroid and bone cancers and leukemia. Children and fetuses are especially vulnerable, he said.
"Very acute radiation, like that which happened in Chernobyl and to the Japanese workers at the nuclear power station, is unlikely for the population," he said.
There have been a total of four explosions at the plant since it was damaged in last Friday's massive quake and tsunami. The most recent were blasts at reactors No. 2 and No. 4.
Concerns now center on damage to a part of the No. 4 reactor's core known as the suppression pool, which helps cool and trap the majority of cesium, iodine and strontium in its water.
Authorities had previously been trying to prevent meltdowns in the complex's nuclear reactors by flooding the chambers with sea water to cool them down.
Murray Jennex, a professor at San Diego State University in California, said the crisis in Japan -- the only nation to have suffered a nuclear attack -- was worse than the Three Mile Island disaster of 1979.
"But you're nowhere near a Chernobyl ... Chernobyl there was no impediment to release, it just blew everything out into the atmosphere," he said. "You've still got a big chunk of the containment there holding most of it in."
Japan braces for potential radiation catastrophe | TPM News Pages
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