The government's nuclear emergency response headquarters on July 24 posted online maps showing the spread of radiation in the first week following the Fukushima No. 1 nuclear power plant accident.
The government's nuclear emergency response headquarters on July 24 posted online maps showing the spread of radiation in the first week following the Fukushima No. 1 nuclear power plant accident.
The maps, about 600 in all, are based on data from the SPEEDI system that predicts radiation spreads in the event of a nuclear emergency.
The data includes the amount of radiation in the atmosphere every hour from 9 a.m. on March 12 to midnight on March 17.
The SPEEDI measurements were entered into a system developed by the National Institute of Radiological Sciences in Chiba city. The government says the maps, in combination with a survey of residents' activities, will assist Fukushima Prefecture in its estimates of residents' exposure levels.
The maps are posted on the Nuclear and Industrial Safety Agency's website (http://www.nisa.meti.go.jp/earthquake/speedi/speedi_index.html).