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- Title
In the Wake of Fukushima: Radiocesium Inventories of Selected North Pacific Fish.
- Authors
Azouz, Hannah R.; Dulai, Henrietta
- Abstract
Thirteen commonly consumed types of fish caught in the North Pacific and locally available in Hawai'i were analyzed using gamma spectroscopy to measure Fukushima-derived and historic 134Cs and 137Cs isotopes. All fish samples had detectable 137Cs above 95% confidence intervals. Three out of the thirteen samples had 134Cs, an isotope indicative of Fukushima releases, detected above 95% confidence intervals. The highest 134Cs and 137Cs concentration in the examined species was in 'ahi tuna, carrying 0.10 ± 0.04 Bq/ kg and 0.62 ± 0.05 Bq/ kg, respectively. Other samples with 134Cs activities found above their 2-sigma uncertainty were albacore tuna and swordfish. Historic and Fukushima-derived contributions were evaluated, and in several samples the Fukushima-derived radiocesium dominated the total radiocesium inventory with up to 61% contribution. All activities were below derived intervention limits of 1,200 Bq/ kg, and the doses to humans from consuming the fish attributable to radiocesium were 0.02 - 0.2 μ Sv, in comparison to 6 - 20 μ Sv contributed by the natural 40 K present in the same fish.
- Subjects
FISH microbiology; SPECTRUM analysis; ISOTOPES; TUNA; SWORDFISH
- Publication
Pacific Science, 2017, Vol 71, Issue 2, p107
- ISSN
0030-8870
- Publication type
Article
- DOI
10.2984/71.2.1