Post by Ex_Nuke_Troop on Apr 27, 2014 23:39:50 GMT
Juan Jose Alava : Simon Fraser University
Conference Proceeding
Modeling the Bioaccumulation Potential of Cesium 137 in a Marine Food Web of the Northwest Pacific, Canada
Juan Jose Alava, Frank A.P.C. Gobas
11/2011; In proceeding of: Society for Environmental Toxciology and Chemistry (SETAC) North America 32nd Annual Meeting, Volume: Abstract Book, 2011, Society of Environmental Toxicology and Chemistry North America 32nd Annual Meeting
ABSTRACT The Fukushima nuclear emergency provoked by the tsunami that impacted the north east coast of Japan on March 11, 2011, emerged as a high priority looming threat due to the risk of radioactive contamination in the global ocean and biodiversity. On April 11, The Fukushima nuclear plant reached the severity level 7, the same as the 1986 Chernobyl nuclear disaster. One of the most persistent isotopes produced and expected to be released by this kind of nuclear accidents was Cesium 137 (137 Cs), with a physical half life of 30 years. In an effort to assess the fate, accumulation and health effects of 137 Cs in marine organisms of the Northwest Pacific after the Fukushima nuclear disaster, we assessed the bioaccumulation potential of 137 Cs by testing steady state and time-dependent bioaccumulation models in an offshore food web that included fish-eating, resident killer whales (Orcinus orca) as one of the major top predators of the marine ecosystems in British Columbia, Canada. The steady stated model showed that concentrations of 137 Cs predicted in the male killer whale were approximately three orders of magnitude higher relative to its major prey, Chinook salmon, and > 13,000 times higher compared to phytoplankton. The time-dependent model showed that after 30 days of radioactive spillage, the 137 Cs concentrations accumulate gradually over time in high trophic level organisms (salmon and killer whales), which exhibited low concentrations likely driven by slow intake rates, while it bioaccumulates at faster uptake rates in low trophic level, gill ventilating organisms (phytoplankton, zooplankton, benthic invertebrates and planktivorous fish), exhibiting concentration about one to two orders of magnitude greater than that in killer whales. At 9125 days (25 years), the predicted concentrations of 137 Cs accumulate in a higher degree in killer whales, being >2 orders of magnitude greater than that predicted in Chinook salmon and 10,000 times higher relative to phytoplankton. The levels of 137 Cs predicted in biota (shellfish and fish) exceeded well above the 137 Cs action level for commercial food/beverage of 1000 Bq/kg established by the Canadian Guidelines for Consumption following a Nuclear Emergency.
www.researchgate.net/publication/233869698_Modeling_the_Bioaccumulation_Potential_of_Cesium_137_in_a_Marine_Food_Web_of_the_Northwest_Pacific_Canada
Conference Proceeding
Modeling the Bioaccumulation Potential of Cesium 137 in a Marine Food Web of the Northwest Pacific, Canada
Juan Jose Alava, Frank A.P.C. Gobas
11/2011; In proceeding of: Society for Environmental Toxciology and Chemistry (SETAC) North America 32nd Annual Meeting, Volume: Abstract Book, 2011, Society of Environmental Toxicology and Chemistry North America 32nd Annual Meeting
ABSTRACT The Fukushima nuclear emergency provoked by the tsunami that impacted the north east coast of Japan on March 11, 2011, emerged as a high priority looming threat due to the risk of radioactive contamination in the global ocean and biodiversity. On April 11, The Fukushima nuclear plant reached the severity level 7, the same as the 1986 Chernobyl nuclear disaster. One of the most persistent isotopes produced and expected to be released by this kind of nuclear accidents was Cesium 137 (137 Cs), with a physical half life of 30 years. In an effort to assess the fate, accumulation and health effects of 137 Cs in marine organisms of the Northwest Pacific after the Fukushima nuclear disaster, we assessed the bioaccumulation potential of 137 Cs by testing steady state and time-dependent bioaccumulation models in an offshore food web that included fish-eating, resident killer whales (Orcinus orca) as one of the major top predators of the marine ecosystems in British Columbia, Canada. The steady stated model showed that concentrations of 137 Cs predicted in the male killer whale were approximately three orders of magnitude higher relative to its major prey, Chinook salmon, and > 13,000 times higher compared to phytoplankton. The time-dependent model showed that after 30 days of radioactive spillage, the 137 Cs concentrations accumulate gradually over time in high trophic level organisms (salmon and killer whales), which exhibited low concentrations likely driven by slow intake rates, while it bioaccumulates at faster uptake rates in low trophic level, gill ventilating organisms (phytoplankton, zooplankton, benthic invertebrates and planktivorous fish), exhibiting concentration about one to two orders of magnitude greater than that in killer whales. At 9125 days (25 years), the predicted concentrations of 137 Cs accumulate in a higher degree in killer whales, being >2 orders of magnitude greater than that predicted in Chinook salmon and 10,000 times higher relative to phytoplankton. The levels of 137 Cs predicted in biota (shellfish and fish) exceeded well above the 137 Cs action level for commercial food/beverage of 1000 Bq/kg established by the Canadian Guidelines for Consumption following a Nuclear Emergency.
www.researchgate.net/publication/233869698_Modeling_the_Bioaccumulation_Potential_of_Cesium_137_in_a_Marine_Food_Web_of_the_Northwest_Pacific_Canada
so whats happening in the Solomons, is haarp missing its mark?