Wo ist die Strahlung am größten, fragen sich die Meeresbiologen seit dem Einleiten der hoch verstrahlten und tödlichen Löschwasser aus der Kernschmelze im japanischen Kenrkraftwerk Fukushima?
In einem Artikel in Nature wird darüber spekuliert:
A team led by Dominique Boust, director of the French Institute of Radioprotection and Nuclear Safety (IRSN) in Cherbourg, is now predicting the level of contamination in marine organisms and sediments using estimates of the quantity of radioisotopes released from Fukushima, and the ratios of those isotopes calculated from available seawater measurements.
The team calculates that about 50 radioisotopes contribute to an overall concentration of roughly 10,000 becquerels per litre in the sea water within 300 metres of Fukushima. Before the accident, caesium-137 concentrations there were about 0.003 becquerels per litre, and iodine-131 was not detectable. On the basis of these figures, the IRSN researchers suggest that sediments in the region could now contain 10,00010 million becquerels per kilogram; fish could carry 10,000100,000 becquerels per kilogram; and algae, some of which are particularly susceptible to iodine uptake, could contain up to 100 million becquerels per kilogram. Japan has legal limits of radioactivity in fish for human consumption of 500 becquerels per kilogram for caesium-137, and 2,000 becquerels per kilogram for iodine-131.
Quelle: Nature.com
….Studies from previous releases of nuclear material in the Irish, Kara and Barents Seas, as well as in the Pacific Ocean, show that such radioactive material does travel with ocean currents, is deposited in marine sediment, and does climb the marine food web. ….
Quelle
http://e360.yale.edu/feature/radioactivity_in_the_ocean_diluted_but_far_from_harmless/2391/