Sun, 13 Oct 2013 12:20:49 +0000
Asahi Shimbun, Oct. 13, 2013: [TEPCO] announced Oct. 12 that it has detected a rising level of radioactive cesium in seawater sampled from the mouth of the harbor [...] a combined 10 becquerels of cesium-134 and cesium-137 per liter*. The level is the highest since the plant operator began sampling water in June at the mouth of the port, which marks the boundary between the harbor around the plant and the ocean. [...] Samples taken a day earlier were below the measurable limits of 1.1 becquerels of cesium-134 and 0.9 becquerel of cesium-137 per liter, the company said. The previous record amount of radioactive cesium detected at the mouth of the harbor was 1.6 becquerels of cesium-134 and 4.7 becquerels of cesium-137 per liter in water sampled on Aug. 19. [...] TEPCO officials said that the environmental impact of the level of cesium detected on Oct. 11 is negligible.
* 10 becquerels per liter = 10,000 becquerels per cubic meter
NRDC, Sept. 24, 2013: We further assume that the cesium bio-accumulates in fish flesh such that the concentration of cesium in the fish meat is 100 times the average concentration of cesium in the water there the fish is swimming.
Oceanus Magazine, May 2, 2013: Food is another pathway into marine organisms and “may be in some cases the most important factor in uptake,” [Scott Fowler, of Stony Brook University after 30 years at the International Atomic Energy Agency’s Marine Environment Laboratories] said. Consumed radioisotopes are assimilated internally through the gut, potentially a far more efficient route than if they are absorbed externally from the environment.
Scott Fowler’s Presentation at the Science Symposium, University of Tokyo, Nov. 12, 2012 (at 13:00 in): It appears fish have a real ability to accumulate cesium. And this is important in the context of Fukushima.
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