(Subscription Only) Title: Worries over highly radioactive fish prompt study
Author: HIROSHI ISHIZUKA
Date: November 13, 2012
Persistently high radioactivity in some fish caught close to the Fukushima nuclear plant has sparked a government investigation into the physiological basis for contamination and why radiation readings in some specimens remain hundreds of times over the official safe limit.
[...] The overall trend has been a decline in detected amounts of radioactive cesium.
However, in August, two greenlings caught 20 kilometers north of the Fukushima plant were found to have cesium levels of 25,800 becquerels per kilogram, the highest level ever measured in fish since the nuclear accident. The government standard for food is 100 becquerels per kilogram.
And in March, tests recorded a level of 18,700 becquerels per kilogram in freshwater salmon in the Niidagawa river near Iitate [...]
The forthcoming study will analyze cesium levels in the fish’s otolith, a part of the inner ear. The otolith is widely used in such research because it is an organ where trace elements tend to accumulate over the animal’s lifespan, leaving a growth record that can be likened to the rings of a tree. [...]
Published: November 13th, 2012 at 7:09 am ET
- Highest Yet: Fish 20 times more radioactive than any other caught since 3/11 — 380 times limit for cesium -NHK August 21, 2012
- NHK: Highest radiation levels ever detected in fish at Fukushima plant — Over 5,000 times gov’t limit February 28, 2013
- Japan Gov’t Data: 65% of marine life test positive for cesium in Nov. — Average catch exceeds new radiation limits @ 111 Bq/kg January 15, 2012
- Kyodo: Radiation surged at Fukushima, gov’t tells Tepco “take action” — Asahi: Fish found with “extremely high levels” of radioactive material 40 km from plant January 11, 2014
- ‘Emergency decontamination’ needed in places used by Fukushima kids — Highly radioactive material accumulating — City Official: Many times higher than previous record for urban areas May 10, 2013