High radiation in fish caught off No. 1 plant


A greenling caught in the Fukushima No. 1 nuclear plant’s small harbor contained 510,000 becquerels of radioactive cesium per kilogram, 5,100 times above the state-set safety limit, Tokyo Electric Power Co. said.

If someone were to eat 1 kg of fish with this level, they would be exposed to about 7.7 millisieverts of internal radiation. Also caught during efforts by Tepco to rid the harbor of all fish was a spotbelly rockfish containing 277,000 becquerels of radioactive cesium per kilogram.

At the mouth of the harbor, where the ocean is about 10 meters deep, Tepco has set up a 2-meter-high net at the seafloor to prevent bottom fish from swimming out. The harbor seabed has been seriously contaminated with radioactive substances.

“If we make the net higher, vessels won’t be able to go through,” said a Tepco official, adding the utility will continue to get rid of fish in the harbor.

The highest level of radioactive cesium found in fish had been 254,000 becquerels per kilogram, also in a spotbelly rockfish caught in the harbor.

  • 秋中 赳

    The human body has more than 4,000 becquerel naturally simply from consuming potassium. 7.7 mSv is approximately the dosage from a chest CT scan, hardly problematic or even remotely dangerous.

    I wonder how many people reading this even know what a becquerel is, or a mSv. People fear what they don’t understand or know, and nuclear power and radioactivity are what most people have no clue about.

    • Smith

      However cesium accumulates in specific organs in the body. A chest xray is spread over the whole body. Internal radiation emitted next to specific cells. Completely different.

    • johnny cassidy

      I didn’t find this article at all alarming as your scary comparison. I eat a ton of fish (at least a kg per month) and my doctor says its good for me but I can’t imagine any medical professional telling a patient to hop in the CT scanner for a ride once a month. That sounds like an awful lot of rads to accumulate. What the heck?