134Cs, a unique indicator of Fukushima impact given its ~ 2 year half life, increased in 2014 and 2015 relative to previous years indicating that peak concentrations are likely to arrive in 2016
Maximum combined radiocesium activities (137Cs + 134Cs) offshore as of summer 2015 are 11 Bq m-3 of seawater are about 8-10 fold less than maximum activities measured in the 1960’s due to weapons testing fallout. Current levels do not represent a significant risk to ecosystem or public health
CCGS Sir Wilfrid Laurier at dock CCG base Victoria, BC.
Results from surface water samples collected in August 2014 during three oceanic research cruises are now available. These seawater samples were analyzed to characterize the distribution of Fukushima derived radionuclides 137-Cesium (137Cs half life ~30 years), and 134-Cesium (134Cs half life ~2 years). Based on the distribution of 134Cs, the Fukushima plume was not consistently present yet on the BC coast. It is likely that peak concentrations of radiocesium will be present offshore in the next year.
The following presentation is for those interested in the most recent, scientifically rigorous, monitoring data related to the impact of the Fukushima Dai-ichi disaster on the health of North Pacific Ocean ecosystem and inhabitants of western North America. Last evening, Sept. 14, 2015 Dr. Ken Buesseler and I reported on monitoring efforts through the Fukushima InFORM and Our Radioactive Ocean projects at a public lecture hosted by the Vancouver Aquarium. The presentation was followed by a Question and Answer period and discussion.
Link to the YouTube video is here in case of browser compatibility problems.
Results* from April citizen science monitoring are now available from 8 of 11 (above: bold italics) of the current InFORM sampling locations. Additionally, two samples from May are available from Ucluelet and Port Renfrew. The Ucluelet sample was collected by the Ucluelet Aquarium for our partner organization, Our Radioactive Ocean, on May 7th and did contain trace amounts (0.5 Bq m-3) of the Fukushima fingerprint, 134Cs, with it’s short ~2 year half life. The total level of activity from this sample is roughly half the activity of the February sample, which was the last time 134Cs was detected on the BC coast. Continue reading July 2015 InFORMal Monitoring Update→
Radiation from Fukushima reactor detected off Vancouver Island
Dirk Meissner, The Canadian Press
Published Monday, April 6, 2015 7:32PM EDT
VICTORIA — Radiation from the leaking Fukushima Daiichi nuclear reactor has been detected on the shores of Vancouver Island, four years after a deadly earthquake and tsunami in Japan killed 16,000 people.