I discussed in the previous post , as vast tracts of land in Japan are contaminated by radioactive waste after the accident in Fukushima (see post: one third of the soils from Japan affected by radioactive contamination ). In principle, one might think thatthe ocean currents dilute the radionuclides . Right! But the process not be so simple.As with other pollutants, water discharges and that leached from soils retain runoff that carries pollution of the seas near coastlines affected , and may even extend them. José Aguado Alonso in his blog “Water”, edit the post titled “ The pollution of marine waters by the Fukushima disaster , “where he realizes it. However, no information cherish the deposition of radionuclides(especially cesium and iodine) in submerged coastal soils or mean residence time, which will depend on factors such as particle size and mineralogical composition of the materials . How to quantify the magnitude of the problem then? Inventory and monitoring are the answer .
Obviously, algae and other non-predators are also affected but should not accumulate large amounts of radioisotopes via the food chain biomagnification . Know if they are in sufficient quantity to prohibit their use, because the Japanese eat abundant coastal seafood, so this process is maintained in humans.
Now, I write these lines in order to bring up about the urgent need for detailed mapping and monitoring of the affected soils. First be detected levels of radioactive contamination of soils (whether on land or under the coastal marine waters . However, everyone knows that different types accumulate (retain-release) contaminants in varying degrees . Consequently, detect problems and future risks, both in terrestrial soils and in the sea (and its release into the water) demand for an essential mapping the same . And we reiterate, as in other post above, that what is usually deposited on soil end in the waters inland (groundwater, surface bodies such as lakes and reservoirs and streams, ie rivers) finally reaching the sea .
To end we will show the first paragraphs of a press release published by the newspaper Public , 28 December 2011, but not before pulling out a clarification. While on the one hand, we reported that triggered the tsunami tragedy hit a disproportionate magnitude for certain hardships due to natural causes (see the note following press release: The Tsunami of Japan was the sum of two giant waves ) on the other attacking the incompetence of the industry and authorities Nippon.Personally I have no evidence to offer my opinion. Now, hundreds remain active nuclear power plants and others under construction. In this situation, what matters to countries that possess them is to claim the bungling occurred in Japan, in order to apostille after they did not happen.But Japan is not no banana republic be precisely contrary to (…). I feel some pity, but also outrage at this kind of tendentious and malicious strategies of governments and nuclear lobbies , we denounce and foresaw years before this unfortunate catastrophe to our post: The Debate on Nuclear Energy, Radioactive Contamination and Public Health George Orwell and 1984 .
We leave you with a few paragraphs of the post interesting in this regard edited Alonso José Aguado Water on his blog.
Obviously the biggest releases of radioactive elements to the sea occurred just after the earthquake. According to the report of SNRI accident since the beginning of the March 11, 2011, there was the direct discharge of radioactive liquid into the sea, which lasted until April 8. In addition to the 22 March saw the sea precipitation of radionuclides emitted into the atmosphere.
(…) Iodine-131 concentrations decreased rapidly with time because its half-life (…) is very short, so that by the end of May the measurement values were below the lower limits of detection . In connection with the cesium-134 and 137 concentrations also decreased with time (…), the reduction of pollution from cesium-134 and 137 resulted from the existence of major ocean currents (…) in the vicinity of the location of the plant nuclear. These currents, resulted in a unique scattering of radioisotopes (…) with a continuous dilution of contaminants therein. This dilution resulted in a significant reduction of environmental impact of the accident in coastal waters.
However, the IRSN said that may persist for some time a significant pollution in the coastal waters near nuclear power plant, caused by the continuous supply of radioactive substances into the sea by river water or surface water runoff to contact contaminated soils . There is also the risk of sporadic discharges of contaminated liquids from the nuclear power plant.
For example, in June, the operator of the plant in Fukushima, Tokyo Electric Company (TEPCO), reported the appearance for the first time since the accident, levels of strontium 89 and 90 in samples collected the seabed off the plant, more than 50 times higher than safety standards set by the government of Japan. The risk of contamination by strontium is its persistence, due to its high half-life (about 29). (…)
Recent measurements to marine species caught off the coast of Fukushima prefecture, mostly fish, reveal the persistence of contamination in them. In addition, during last October, researchers at the University of Tokyo reported the presence of high concentrations of radioactive cesium in plankton samples collected in the vicinity of the central (…). This control is especially important in predators such as tuna or swordfish, accumulate the radioactivity of the species that are fed throughout their lives. (…) Applying this correlation have estimated that the total amount of cesium-137 discharged to sea until mid-July was of 27.1015 Bq, which is the biggest release of artificial radionuclides to the marine environment undertaken to date.
All failed in Fukushima . The accident at the plant in Fukushima Daiichi nuclear crisis has been the worst since Chernobyl (1986) (….) a map of radiation covering 18 of its 47 prefectures and already the largest toxic waste into the sea of history.
The accident was triggered after an earthquake and tsunami and incomunicaran vandalize the plant, but what happened is far from being considered a natural disaster, as is clear from reading the official report commissioned by the Government of Japan to unravel what happened in the plant.
|Category: Health Science||Tags: radioactive|