Here's some clippings from an Article in the Vancouver Sun :
By Tracy Sherlock, Vancouver Sun March 29, 2011
VANCOUVER — Radiation from the Japanese nuclear reactor damaged in the March 11 earthquake and tsunami has been detected in B.C. seaweed and rainwater samples, researchers say.
“As of now, the levels we’re seeing are not harmful to humans. We’re basing this on Japanese studies following the Chernobyl incident in 1986 where levels of iodine-131 were four times higher than what we’ve detected in our rainwater so far,” Starosta said. “Studies of nuclear incidents and exposures are used to define radiation levels at which the increase in cancer risk is statistically significant. When compared to the information we have today, we have not reached levels of elevated risk.”
“The only possible source of iodine-131 in the atmosphere is a release from a nuclear fission,” Starosta said. “Iodine-131 has a half-life of eight days, thus we conclude the only possible release which could happen is from the Fukushima incident.”
The radiation found in B.C. was carried by the jet stream, and is now falling over the West Coast with rain, which is mixing with sea water and accumulating in seaweed, SFU said in a news release.
Starosta predicts iodine-131 will be detected in B.C. up to three or four weeks after the Fukushima nuclear reactor stops releasing radioactivity into the atmosphere. The researchers will continue to monitor iodine-131 levels.
More than 27,000 people are dead or missing across northeast Japan after the 9.0 earthquake and tsunami, Reuters reported.
Update 13 April: http://ctbyo.org
Spreading across the entire globe, radioactivity also measured in the southern hemisphere -
“Nine days after the accident, the radioactive cloud had crossed Northern America. Three days later when a station in Iceland picked up radioactive materials, it was clear that the cloud had reached Europe. By day 15, traces from the accident in Fukushima were detectable all across the northern hemisphere. For the first four weeks, the radioactive materials remained confined to the northern hemisphere, with the equator initially acting as a dividing line between the northern and southern air masses. As of 13 April, radioactivity had spread to the southern hemisphere of the Asia-Pacific region and had been detected at stations located for example in Australia, Fiji, Malaysia and Papua New Guinea.”