Radioactive Japanese fish.

It was announced by Tepco today that 190,000 Bq/kg of radioactive cesium was found in murasoi rockfish in the Fukushima harbor area. This is the same fish species in which 254,000 Bq/kg was found last January.

The Japanese Meteorological Research Institute announced at a meeting of the IAEA that 60 billion becquerels of cesium was determined to be released to the open ocean in one day.

After the recent typhoon, 1,130 tons of radioactive rainwater was dumped into the ocean, containing 8.85 million becquerels. Obviously, the day-to-day releases far exceed the excess contaminated rainfall from the typhoon.

The following video was shot at a fish market in Ibaraki prefecture. The external radiation dose ranged up to 0.87 uSv/hr in Japanese fish. Fish from foreign countries did not have increased radiation levels.

Note that the plastic packaging blocks all the alpha radiation (like uranium and plutonium), and the packaging, along with the fish mass itself, blocks most of the beta radiation (like strontium and tritium). The beta radiation being released into the Pacific far exceeds the gamma radiation that we see here.

The Japanese government is considering filing suit in the WTO against South Korea for banning the importation of Japanese fish into their country. They say radioactive fish is a “harmful rumor.”

大韓民国が日本の魚介類を輸入禁止にする理由 茨城沖の魚介類

3 thoughts on “Radioactive Japanese fish.

  1. ANALYSIS: Contaminated water flowing into ocean despite Abe’s claim

    Michio Aoyama, a senior researcher of marine chemistry at the Japan Meteorological Agency’s Meteorological Research Institute, estimated that 30 billion becquerels of radioactive cesium and another 30 billion becquerels of radioactive strontium continue to leak into the outer ocean every day.

    Radioactive materials decay with time at fixed rates, but available monitoring data have shown no decline in their levels.

    A daily input of 60 billion becquerels is required to make that happen, Aoyama said…

    To deal with the situation, Tokyo Electric Power Co. installed 0.5-millimeter-thick polyester barriers, which it calls “silt fences,” in the harbor in April 2011 to suppress seawater traffic. But the barriers cannot totally block the movement of radioactive substances because water and fine mud particles can penetrate the silt fences through grids of minuscule holes, each 0.02 to 0.03 millimeter in size.

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