Concerned with the lack of understandable information in the current situation, the Institute for Information Design Japan - IIDj, is collecting available measurements to provide a consistent and comprehensive Japan Radiation Map. Most of the data used are updated hourly, however some sources provide data in larger intervals or require manual transcription; in this case we can not guarantee regular updates. We do intentionally refrain from using any interpretative elements - such as thresholds or advisories. This needs to happen somewhere else with more competent people involved. Measurements are interchangeably provided in Gray/Sievert units at the source. Here all measurements are given in the nano Sievert/hour (nSv/h) measure - following the simplified equation where 1 Gray (Gy) = 1 Sievert (Sv).
IIDj, Institute for Information Design Japan | mail Disclaimer: IIDj has no past nor current business relations with any of the actors in the nuclear power industry.
This map shows over 2,500 up-to-date radiation measurements, collected from different sources. On roll-over specific information is provided for that particular location - radiation levels are visualized by the colored square's size. Locations marked with the + sign reveal more locations on zoom-in. Click here for more details.