Tag Archives: Sievert

The Impact of the Fukushima on Canada: Health Canada Reports

By Jay T. Cullen

The purpose of this post is to bring to the attention of interested readers a recently released report that provides comprehensive account of the environmental radiation surveillance activities conducted by Health Canada in the months immediately following the Fukushima accident.  This report includes an assessment of the overall levels of contamination and resulting impacts to the health of Canadians.  Contrary to irresponsible and inaccurate rumors that Health Canada suspended monitoring in the wake of the triple meltdowns, monitoring activities were, in fact, enhanced and expanded to increase the flow of information and improve understanding of the implications of the contamination for environmental and public health.  While there was no discernible change in total background radiation a distributed system of monitoring stations and the rapid collection and measurement of environmental samples tracked the trace levels of atmospheric contamination across the country. The report concludes:

  1. conservative estimates of the maximum individual dose from Fukushima was less than 0.0003 (1/ 3,000) of the typical annual dose for a Canadian owing to natural background sources
  2. the additional dose resulting from Fukushima derived contamination is far less than the normal variation in dose from place to place in Canada
  3. there are likely to be no health impacts related to this small, incremental dose

Continue reading The Impact of the Fukushima on Canada: Health Canada Reports

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Looking For Fukushima Radionuclides in Fish Caught Off the West Coast of Canada

by Jay T. Cullen

The purpose of this post is to report measurements of radioactivity in fish caught off the west coast of Canada based on the work of InFORM team member Dr. Jing Chen.  A collaborative effort between Health Canada, Department of Fisheries and Oceans Canada, and the University of Victoria was published in May 2014 in the peer-reviewed, open-access scientific journal Radiation Protection Dosimetry (link). The authors examined the activities of cesium radioisotopes (134-Cs half-life ~2 years and 137-Cs half-life ~30 years) that were released in large quantities due to the triple reactor meltdowns at Fukushima Dai-ichi Nuclear Power Plant in 2011 as well as a naturally occurring polonium isotope (210-Po) that can pose radiological health concerns for human consumers of marine fish. Samples of chum and coho salmon, halibutsablefish and spiny dogfish were analyzed and none were found to contain detectable levels of Fukushima derived radionuclides. Radiation doses to human consumers were determined by assuming a conservative worst case scenario where Cs isotopes were present at detection limits of the measurement and found to be 18 times lower than doses attributable to the naturally occurring, alpha-emitter 210-Po. The authors conclude that the radiation dose from Fukushima derived isotopes present in fish caught in Canadian waters represent a very small fraction of the annual dose from exposure to natural background radiation. Based on these measurements, at present, Fukushima derived radionuclides in fish do not represent a significant radiological health risk to Canadians. Continue reading Looking For Fukushima Radionuclides in Fish Caught Off the West Coast of Canada