Tag Archives: 134-Cs

Coastal, Monitoring, Oceanic

Fukushima Contamination Detected at Shoreline in British Columbia

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Satellite measurements of ocean temperature (illustrated by color) and the direction of currents (white arrows) help show where radionuclides from Fukushima are transported. Large scale currents transport water westward across the Pacific. Circles indicate the locations where water samples were collected. White circles indicate that no cesium-134 was detected. Blue circles indicate locations were low levels of cesium-134 were detected. Small amounts of cesium-134 have been detected in a water sample taken Feb. 19, 2015, from a dock in Ucluelet, British Columbia. (Woods Hole Oceanographic Institution)


The purpose of this post is to report that for the first time ocean borne contamination from Fukushima has been detected at the shoreline in British Columbia representing the first landfall in North America. Citizen scientists collected the sample on February 19, 2015 in the town of Ucluelet on the west coast of Vancouver Island Canada as part of our partner program Our Radioactive Ocean out of Woods Hole Oceanographic Institution in the USA. The isotope Cesium-134 (134Cs half life ~2 years) is an unequivocal fingerprint of Fukushima derived contamination because all other sources of this man made isotope (principally the Chernobyl disaster in 1986) are far enough in the past that 134Cs has long since decayed to levels too low to detect today. The Ucluelet sample contained 134Cs at 1.4 Becquerel per cubic meter (Bq m-3) of seawater and 5.8 Bq m-3 of the longer lived 137Cs (half life ~30 years). These levels were expected given measurements made by monitoring programs offshore and modeling studies which predict the arrival time and activity of Fukushima radionuclides. These levels of 137Cs and 134Cs, are well below internationally established levels that might represent a danger to human or environmental health. The next number of months will be very important to track the ocean transport of the contamination as citizen scientists with Our Radioactive Ocean and the InFORM project continue to collect samples up and down the coast of North America. Continue reading Fukushima Contamination Detected at Shoreline in British Columbia →
Cesium, Fukushima, Japan, Marine Life, Peer Reviewed, Seawater, Strontium

Fukushima Radionuclides in Pacific: Doses to Japanese and World Public Unlikely to Cause Health Damage

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By Jay T. Cullen

The purpose of this post is to summarize a the most recent, peer reviewed scientific study to examine the likely impact of Fukushima contamination of the North Pacific on human health. The blog is part of a continuing series that seeks to communicate the results of scientific studies aimed at determining the impact of the triple meltdowns at the Fukushima Dai-ichi nuclear power plant (FDNPP) on ecosystem and public health. Povinec and Hirose’s recent paper in Scientific Reports examined the variation in Fukushima derived 90-Strontium (90Sr half life 28.8 years), 134-Cesium (134Cs half life ~2 years) and 137-Cesium (137Cs half life ~30 years) in seawater and biota offshore of the FDNPP and in the northwest Pacific. These isotopes are most likely to represent radiologically health risks to consumers of Pacific seafood given their propensity to concentrate in organisms and, in the case of 90Sr and 137Cs, their longevity in the environment. Doses to the Japanese and world population were estimated and compared to doses attributable to naturally occurring isotopes present in food. Doses from food caught in coastal waters right next to the FDNPP to 20 km offshore were similar to doses from naturally occurring isotopes (primarily 210Po) while doses from the consumption off fish caught in the open northwest Pacific were much lower than natural doses. In each case the individual doses are well below levels where any negative health effects would be measurable in Japan or elsewhere. Continue reading Fukushima Radionuclides in Pacific: Doses to Japanese and World Public Unlikely to Cause Health Damage →