Wednesday, March 4, 2015

Fukushima Fallout Detected In U.S. Fish 


Dose equal to samples caught 100 miles from plant — Persistently high levels detected in marine life offshore “not anticipated… orders of magnitude” more than expected — “Measurements needed… along predicted plume trajectory”

Excerpts from Radiological Dose Rates to Marine Fish from the Fukushima Daiichi Accident: The First Three Years Across the North Pacific’, includes authors from Japan’s National Institute of Radiological Sciences and Oregon St. Univ., 2015 (emphasis added):
A more complete record is emerging of radionuclide measurements in fish [from] across the Pacific… Fish 100–200 km east of [Fukushima], coastal fish in the Aleutian Islands… and trans-Pacific migratory species, all had increased dose rates as a consequence of the FDNPP accident.

  • FDNPP produced the largest single-event influx of radioactive cesium isotopes into the Pacific [137Cs up to 90 PBq; Chernobyl total: 70-85 PBq].
  • Dose rates to the most impacted fish species near the FDNPP have remained above benchmark levels for potential dose effects at least three years longer than was indicated by previous, data-limited, evaluations.
  • [Strontium-90] was estimated to contribute up to approximately one-half of the total 2013 dose rate to fish near the FDNPP.
  • Evaluations… suggested that the dose rates to fish near the FDNPP… only briefly remained above the benchmark levels for potential harmful effects… However, subsequent data have indicated highly elevated and persistent accumulation of Cs.
  • Maximally exposed fish near the FDNPP [had] an increase of more than six orders of magnitude… The elevated activity concentrations were not isolated to one sample, or one species. In 2013, activity concentrations of 134,137Cs exceeding [100,000 Bq] kg were measured in more than 100 fish from ten species sampled from FDNPP port… concentrations in [some species] are orders of magnitude higher than predicted.
  • Some of the released radionuclides are being carried long distances
  • At Amchitka Island [in Alaska] the 134,137Cs dose rates to [greenling and rockfish] were only slightly higher than pre-event levels… The increase… appears to be due to atmospheric transport from Fukushima as 134Cs was measured… in freshwater fish [11 Bq/kg in trout].
  • Detections of 134Cs in California water samples gathered in August 2014… suggest incremental dose rate increases to resident fish.
  • Fish at 100–200 km east of the FDNPP, coastal fish in the Aleutian Islands, and trans-Pacific migratory species all had increased dose rates.
  • Persistence of the radionuclides in fish was not anticipated by existing models… ongoing measurements are needed at locations near the FDNPP and further along the predicted plume trajectory… Some areas that have experienced air deposition in 2011 (e.g. Aleutian Islands), should continue monitoring as they may experience a second arrival of 134,137Cs in subsequent years via an oceanic plume.
  • This study was in collaboration with the… IAEA
Source 

See also: Gov’t: Alaska island “appears to show impacts from Fukushima” — “Significant cesium signature” — Scientists anticipate further impact as ocean p

Related Posts

  1. Gov’t Expert: Fallout in California thousands of times higher than we expected for several days after Fukushima explosions — ‘Orders of magnitude’ above estimates at start of crisis, even though estimations based on Chernobyl — Article: Releases at these levels would mean “many hundreds of kilograms” of “many other fission products!” (MAP) September 23, 2014
  2. Professors: Seafood off N. American coast predicted to exceed gov’t radioactivity limit — “High priority looming threat” to global ocean from Fukushima releases — Radiation levels ‘well above’ 1,000 Bq/kg according to model April 6, 2014
  3. Japan Researchers: Models show North America hit with ‘very high’ levels from Fukushima plume — Radioactive material in ocean off West Coast was up to 500 times more than expected (VIDEO) August 27, 2014
  4. Reuters: “Unsafe levels of radiation” were released during WIPP accident; More workers contaminated with plutonium — AP: Leak of radioactive material could’ve been “orders of magnitude larger”; Feds now testing air & soil 50 miles from site (AUDIO) March 31, 2014
  5. Experts: Areas along West Coast “may be… affected in a significant way” by Fukushima plume in coming months — Impact cannot be accurately predicted, currents to produce complex results — Radioactive materials can be ‘fairly concentrated’ even after crossing Pacific February 24, 2014


 

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