Fukushima Daiichi Cs 137 dispersion model from NOAA

The simulation from NOAA’s HYSPLIT model shows a continuous release of tracer particles at a rate of 100 per hour representing the Cesium-137 emitted from Fukushima Daiichi. Each change in particle color (red, orange, yellow, cyan, green, blue, violet, magenta) represents a decrease in radioactivity by a factor of 10. Radioactivity decreases only due to wet and dry deposition. Decay is not a factor for Cesium in this short duration simulation compared to its long-half life. The air concentration would be computed from the particle density so it is only partially related to the color scale. Emissions occurred from 12-31 March, but the particles are followed through the end of April using meteorological data from the 1-degree resolution NOAA global analyses. The maximum cesium emissions on March 15th are shown by the red color and represent a particle activity of 5E 12 Bq. More information about how this modeling was done can be found at: Alternative news outlets for Fukushima: YouTube channels: