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In the first week of September the Ministry of Science published a new map showing radiation levels in Fukushima and four surrounding prefectures, based on the results of an aerial survey. In the map, different colors were used to show the level of radiation at locations one meter above the ground. Red: 19 microsieverts per hour or higher.
The Fukushima nuclear accident was a major nuclear accident at the Fukushima Daiichi Nuclear Power Plant in Ōkuma, Fukushima, Japan, which began on 11 March 2011. The proximate cause of the accident was the 2011 Tōhoku earthquake and tsunami , which resulted in electrical grid failure and damaged nearly all of the power plant's backup energy ...
Data on marine foods indicates their radioactive concentrations are falling towards initial levels. 41% of samples caught off the Fukushima coast in 2011 had caesium-137 concentrations above the legal limit (100 becquerels per kilogram), and this had declined to 0.05% in 2015. [123]
The radiation level measured was 72.9 sieverts per hour. Because of this, the endoscope could only function for a few hours. For reactors number 1 and 3, no endoscopic survey was planned at that time, because the actual radiation levels were too high for humans. [34] [dead link ] [35] [36]
This would make Fukushima the second Level 7 "major accident" in the history of the nuclear industry; however, radioactivity released as a result of the events at Fukushima was, as of 12 April, only approximately 10% of that released as a result of the accident at Chernobyl (1986), also rated as INES Level 7.
Maximum level of radiation detected: ... Fukushima 12 – 15 March 2011 400,000 3,000 30,000 ZAMG [25] 2 April 2011 Fukushima 12 – 19 March 2011 10,000
TEPCO was able to estimate radiation levels of 530 Sv/hr, the highest level measured since the March 2011 accident when the previous high was measured at 73 Sv/hr. [80] [81] [82] This does not represent an increase in radiation at the reactor, but rather is the first measurement taken in the containment vessel at this location. [83]
The Fukushima Daiichi nuclear accident was originally rated as INES 5, but then upgraded to INES 7 (the highest level) when the events of units 1, 2 and 3 were combined into a single event and the combined release of radiological material was the determining factor for the INES rating. [43]