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US NOAA Fukushima radioactive aerosol dispersion model clearly shows Fukushima nuclear disaster discharges blowing offshore and impacting North America. Fukushima has continued to discharge radioactive materials into the air, and water, as even admitted by TEPCO. They probably wait until the wind is blowing offshore to vent radioactive materials, to the extent possible.
Link: http://youtu.be/teV44bW30Z4 
This is the NOAA model of radioactive discharges from the Fukushima nuclear disaster from 12 to 31 March of 2011. It is only of Cesium 137, and not the other radionuclides.
The melted down reactors continue to discharge into the air, as well as ocean. Thus radioactive materials continue to be dispersed.
Cesium 137 has a half life of 30 years, so that it will take over 400 years before radiation from these and other discharges of Cesium 137 become non-radioactive. They note that radioactivity decreases in the atmosphere due to rainfall and settling. That means it landed on the earth or in the oceans: “Radioactivity decreases due to removal by rainfall and gravitational settling. Decay is not a factor for Cesium in this short duration simulation compared to its 30 year long-half life“.
The levels of radiation allowed in US food are enormous – over 1500 Bq/kg, compared to 100 Bq/kg for Japan. Much of US food comes from the US west coast, including organic. At least one Fukushima farmer seems to have been selling Fukushima rice as organic.
“Fukushima Radioactive Aerosol Dispersion Model
Description
The Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model was developed by NOAA to follow the transport and dispersion of pollutants in the atmosphere. In HYSPLIT, the computation is composed of four components: transport by the mean wind, turbulent dispersion, scavenging and decay. A large number of pollutant particles, which by convention are called “particles” but are just computational “points” (particles or gases), are released at the source location and passively follow the wind.
The 2011 Tohuku East Japan earthquake and resulting tsunami caused a variety of failures at the Fukushima Daiichi Nuclear Power Plant which resulted in radioactive emissions to the atmosphere. The earthquake occurred on March 11th at 14:26 Japan Standard Time (JST), the tsunami about one hour later at 15:41, and by 16:36 a nuclear emergency was reported. By the early morning hours of March 12th, radioactive emissions were occurring from the plant.
In this dataset, the simulation from NOAA’s HYSPLIT model shows a continuous release of tracer particles from 12-31 March at a rate of 100 per hour representing the Cesium-137 emitted from Fukushima Daiichi. Each change in particle color represents a decrease in radioactivity by a factor of 10.
Radioactivity decreases due to removal by rainfall and gravitational settling. Decay is not a factor for Cesium in this short duration simulation compared to its 30 year long-half life.
The air concentration would be computed from the particle density so it is only partially related to the color scale. The released particles are followed through the end of April using meteorological data from the 1-degree resolution NOAA global analyses.
Notable Features
* Particles with the highest radioactivity were released around March 15th
* Radioactivity is measured in units of Becquerel defined as the disintegration of one atom per second
* Particles in counter-clockwise circulations are caught in low-pressure systems resulting in greater depletion of the radioactivity by rainfall
* Particles caught in clockwise circulations are embedded in fair weather high pressure systems and their radioactivity will persist for longer periods
* In general, radioactivity reaching the United States showed air concentrations over 1000 times smaller than areas near Japan ” http://web.archive.org/web/20170804035754/https://sos.noaa.gov/datasets/fukushima-radioactive-aerosol-dispersion-model Can still be downloaded from original.
It’s impossible to evaluate the hazard without knowing either the ratios of each radionuclide type likely present, or becquerels of each radionuclide type present, from which one can estimate mrem or mSv exposures.
Currently the US FDA allows around 15 times more radiation in food than Japan all of the time, because they have decided to assume that only part of the food is contaminated.
10 to 15 times more radiation is allowed in food in the US, Australia, Canada, and New Zealand than in Japan. The US has the weakest “standards” of all, allowing food to have around 1,200 – 1,500 Becquerels per kg, i.e. 1,200-1,500 radioactive emissions per second per kg, compared to 100 Bq/kg in Japan. (A kg is 2.2 pounds.) The amount allowed in Japan for children is even less than 100 Bq/kg. See: https://miningawareness.wordpress.com/2015/01/09/dumping-radioactive-food-from-japan-on-the-world-why-the-tpp-is-a-pending-disaster/
Mining Awareness + 
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