Study: First time in history xenon-133 detected in Southern Hemisphere — Cs-137 also measured — Darwin station, Australia

Published: March 1st, 2012 at 8:06 pm ET
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Title: Xenon-133 and caesium-137 releases into the atmosphere from the Fukushima Dai-ichi nuclear power plant: determination of the source term, atmospheric dispersion, and deposition
Source: Atmospheric Chemistry and Physics; Atmos. Chem. Phys., 12, 2313–2343, 2012 www.atmos-chem-phys.net/12/2313/2012/ doi:10.5194/acp-12-2313-2012
Authors: A. Stohl1, P. Seibert2, G. Wotawa3, D. Arnold2,4, J. F. Burkhart1, S. Eckhardt1, C. Tapia5, A. Vargas4, and T. J. Yasunari6
1 NILU – Norwegian Institute for Air Research, Kjeller, Norway
2 Institute of Meteorology, University of Natural Resources and Life Sciences, Vienna, Austria
3 Central Institute for Meteorology and Geodynamics, Vienna, Austria
4 Institute of Energy Technologies (INTE), Technical University of Catalonia (UPC), Barcelona, Spain
5 Department of Physics and Nucelar Engineering (FEN),Technical University of Catalonia (UPC), Barcelona, Spain
6 Universities Space Research Association, Goddard Earth Sciences and Technology and Research, Columbia, MD 21044, USA
Date: Received: 8 October 2011 – Published in Atmos. Chem. Phys. Discuss.: 20 October 2011
Revised: 1 February 2012 – Accepted: 23 February 2012 – Published: 1 March 2012

[...] By middle of April, 133Xe was fairly uniformly distributed in the middle latitudes of the entire Northern Hemisphere and was for the first time also measured in the Southern Hemisphere (Darwin station, Australia). [...]

During the accident events, 133Xe and 137Cs from FD-NPP were dispersed throughout the Northern Hemisphere and eventually also reached the Southern Hemisphere. [...]

In April all measurement stations recorded an enhanced (but due to radioactive decay, decreasing) background of 133Xe caused by the FD-NPP emissions, indicating the transition to complete dispersion in the Northern Hemisphere (see Stohl et al., 2012). Even the Australian station Darwin started recording enhanced 133Xe concentrations in April, indicating penetration of radioactive contamination into the Southern Hemisphere.  [...]

Published: March 1st, 2012 at 8:06 pm ET
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