Report: 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
See also: Gov’t: Alaska island “appears to show impacts from Fukushima” — “Significant cesium signature” — Scientists anticipate further impact as ocean plume arrives (VIDEO)
- Gov’t: Radioactive release “orders of magnitude” worse than predicted at US nuclear dump — 370 Billion Bq of Plutonium equivalent may have escaped from WIPP drum during “thermal runaway” & multiple fires — For amount to be that high, a “significant number” of breached drums is expected (VIDEO) May 1, 2015
- 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
- Gov’t Expert: West Coast will soon be hit by 800 Trillion Bq of Fukushima Cesium-137 — Nearly equal to amount of fallout deposited on Japan — Levels in Pacific “higher than expected” — “Main body of surface plume has reached off coast of US” — Never slowed down while crossing ocean, contrary to prediction June 7, 2015
- Unpublished gov’t map shows massive plume of Fukushima radioactive material just off West Coast of North America — Radiation levels quadrupled in recent months — Scientist: “We are starting to see the penetration of cesium from offshore… to the coast” (VIDEO & MAP) October 13, 2015
- US Gov’t: Alaska island “appears to show impacts from Fukushima” — “Significant cesium isotope signature” detected — Scientists anticipate more marine life to be impacted as ocean plume arrives (VIDEO) November 14, 2013