100bq/m^3 (becquerel per cubic meter) is the yellow in the map and about the highest concentration I see in the map.
Bananas (also yellow) are 3520 pCi/kg* or about 130bq/kg.
The density of a banana is 950kg/m^3 (thanks wolfram alpha!) so it has a radioactive concentration of 12400bq/m^3.
So this plume at its highest (yellow) is about 0.08% the radioactive concentration of a banana.
Granted the absorbed dose is dependent on the nature of the activity, which in this case is Cs-137 (662KeV gammas compared with 1460KeV gammas from potassium (found in bananas).
Unless I am missing some information, I don't see this as a big deal. Like I said at the beginning, please point out any errors I am making or fill me in if there is some information I am missing.
(*From here: http://www.physics.isu.edu/radinf/natural.htm)
All thou this report says it is just hitting the west coast, I have other data that supports that it has already been contaminating the west coast for years.
April 20, 2014 -- (TRN) -- According to scientists and marine biologists, radiation in the Pacific Ocean from the 2011 Fukushima nuclear disaster in Japan, will begin making landfall along the west coast of North America 7 days from today. The three melted-down reactors in Fukushima have been spewing 300 tons of radioactive water into the Pacific each and every day since the March, 2011 earthquake and tsunami which caused the triple-meltdown. That water, some from trenches around the reactors containing four million times the legal radiation limit, has been carried by ocean currents from Japan toward north America for the last three years. It will begin hitting the west coast next weekend. Most frightening: NO ocean water testing or emergency preparations at all have been undertaken by either states or the U.S. federal government. When the ocean radiation plume hits, you are on your own.
Read the report: