Get an Unbiased Discussion of Hot Particles in Seattle, etc from UC Berkeley's Department of Nuclear Engineering at:
www.nuc.berkeley.edu/node/4459
Check this Comparison of Maps
from alexanderhiggins.com
Note the light Blue color in California, etc shows higher Cesium levels than in southwest and northern Japan.
Movie of the Fukushima-Daichii activity in the air (caesium-137, ground level)
The simulation was performed with a specific version of the
numerical atmospheric chemistry and transport
model Polyphemus/Polair3D. The parametrisations used for the
transport and physical removal of the radionuclides are described in [1,2,3,4].
The magnitude of activity concentration field is uncertain and could be
significantly different from the actual one. In particular, the source term remains uncertain.
Therefore, these results should be seen as preliminary and they
are likely to be revised as new information become available to
better constrain the source term and when radionuclides data can
be used to evaluate the model simulation results.