Potential Ιώδιο-131 Cloud Spread - Fukushima I Nuclear Power Plant
The colour scale shows a total of five colours. βArea Aβ (violet) is meant to mark an area with maximum dose rate of 0,3 ΞΌSv/h, which corresponds to the amount of the natural background radiation dose. βArea Bβ (blue) marks a region with 3 Micro-Sievert per hour. Finally, one arrives in βArea Eβ with a maximum dose rate of 3 Milli-Sievert per hour. This dose rate is currently certainly not exceeded in the regional area (25x25 km2 box) around the NPP. Irrespective of the assumed emissions, the maximum value of the model is always used to determine βArea Eβ. In case the situation around the NPP is changing to the worse, the scale would be adapted.
Please keep in mind that, due to the decreasing level of radioactivity in the crisis region, the actual area of influence is likely much smaller than the one displayed here.