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Links concerning the events in the Fukushima power plant:
This is an elaborate and comprehensive text from the Federal Bureau of Radiation Protection. Attention is given in detail to the possible consequences for people in Europe: http://www.bfs.de/DE/themen/ion/notfallschutz/messnetz/imis/imis.html
The Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) presents a frequently updated catalogue of events, situations and measurement values. Because of the use of technicals terms, it may not be wholly comprehensible for non-experts. This compilation is done on behalf of the Federal Ministry of the Environment (BMU). http://fukushima.grs.de
The webpage of the BMU: http://www.bmu.de/allgemein/aktuell/160.php
Information on the Fukushima nuclear accident (oral presentation given by Dr. Helmut Fischer at the Physical Colloquium, University of Bremen on March 31st, 2011): pdf file (in german)