Title: Does the Fukushima NPP disaster affect the caesium activity of North Atlantic Ocean fish?
Source: Biogeosciences Discussions
Authors: G. Kanisch and M.-O. Aust; Thünen Institute of Fisheries Ecology, Hamburg, Germany
Date Published: March 5, 2013
[...] On 11 March 2011, a Tsunami hit the Fukushima-Daiichi nuclear power plant (FDNPP), which caused the loss of cooling capacity in four of its six nuclear reactors and 25 led to the release a radionuclides into the environment. It is expected that between 6 and 47 PBq (1 PBq= 1015 Bq) of 137Cs (half-live 30.17 yr) was directly discharged into the Pacific Ocean (e.g. Bailly du Bois et al., 2012) in the aftermath of the tragedy. Due to the determined 134Cs : 137Cs ratio of around one, about the same amount of 134Cs (half-live 2.07 yr) was discharged into the Pacific. Initially, discharge was assumed to represent the larger fraction of total Cs-releases. Therefore, many researchers and TEPCO focussed [sic] on the determination and estimation of the behaviour of Cs in Pacific waters and its behaviour in the environment, especially the uptake by biota (e.g. Buesseler et al., 2011, 2012; Honda et al., 2012; Madigan et al., 2012; Behrens et al., 2012).
The explosions of units 1 to 4 of FD-NPP also released radionuclides into the atmosphere which were detectable around the world (e.g. Hsu et al., 2012; Stohl et al., 2012; Jakobs, 2011). From these investigations the wet and dry deposition of caesium isotopes in marine areas where German monitoring was carried out after the accident at FD-NPP occurred, which are the North Sea, the Baltic Sea, and the coastal West and East Greenland currents, were estimated to be between 0.1 and 100 Bqm−2. [...]
Nearly all reports on this matter to date have used the 27.1 PBq (quadrillion) figure as the maximum direct cesium-137 release into ocean. Even yesterday’s informative report from Enformable comparing Chernobyl’s releases to Fukushima used the 27.1 PBq figure, rather than the 47 PBq mentioned above.
Published: March 12th, 2013 at 12:39 pm ET