Toxicologist Lee Tin-lap at the Chinese University of Hong Kong said such a radiation level was not an immediate threat to people but the long-term consequences were unknown.
"You are still breathing this into your lungs, and there is passive absorption in the skin, eyes and mouth and we really do not know what long-term impact that would have," Lee told Reuters by telephone.
Around eight hours after the explosions, the U.N. weather agency said winds were dispersing radioactive material over the Pacific Ocean, away from Japan and other Asian countries. end quote.
next quote.
Authorities have spent days desperately trying to prevent the water which is designed to cool the radioactive cores of the reactors from running dry, overheating and emitting dangerous radioactive materials.
They said they may use helicopters to pour water on the most critical reactor, No. 4, within two or three days, but did not say why they would have to wait to do this.
"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.
The plant operator pulled out 750 workers, leaving just 50, and a 30-km (19 mile) no-fly zone was imposed around the reactors. There have been no detailed updates on what levels the radiation reached inside the exclusion zone where people live.
"Radioactive material will reach Tokyo but it is not harmful to human bodies because it will be dissipated by the time it gets to Tokyo," said Koji Yamazaki, professor at Hokkaido University graduate school of environmental science. "If the wind gets stronger, it means the material flies faster but it will be even more dispersed in the air." end quote.
http://news.yahoo.com/s/nm/20110315/ts_nm/us_japan_quake
My thought is that Japanese people since they tend to eat a lot of seaweed as part of their diet already, will tend to be more protected because of the natural iodine in seaweed. However, people in other parts of the Pacific Region where the prevailing wind is blowing and all around the world as the radiation travels on the wind need to be aware that iodine pills and eating seaweed might prevent thyroid cancer from the blowing radiation on the wind in the short and long run. Also, radiation tends to concentrate in dairy milk and meat. So, dairy and meat could contribute in some cases towards higher concentrations of radiation in your bodies and the bodies of your families now worldwide.
Later: My daughter who is 22 was explaining to me that by taking iodine supplements either by tablet or liquid or seaweed you fill up your thyroid glands(both sexes), aureola(both sexes) and sexual organs(both sexes) and saliva glands (both sexes) and thereby prevent cancer in all those areas from radiation exposure. By taking supplements you fill up your physical capacity for iodine so your body doesn't take on radioactive iodine from the radiation in the air. Human Bodies use natural iodine to fight infections. So, by filling up your body's capacity with good iodine you tend to keep out the bad radioactive iodine that can cause cancer worldwide.
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