I don’t have a source for you to read but the radiation continues to pour out of at least two reactors.
Jack, radiation is to a radioactive source like stench is to dog poop. Radiation is not killing Americans long distance from Fukushima.
There are three means by which radiation is blocked: distance, time, and shielding.
Distance: the United States is thousands of miles from the radioactive piles at Fukushima. It isn’t affecting us here.
Time: radioactive elements have a half-life.
Shielding: water, cement (concrete), and lead will shield against radiation exposure. Alpha particles from Plutonium and Polonium can be sheilded by a sheet of paper. Atomic particles in sea water are dangerous if swallowed or inhaled via water spray. I would not go skinny dipping in the sea near Fukushima.
The fear of atomic particles in seawater is perhaps the greatest concern to Americans, and I can understand that fear. Airborne atomic particles, such as in fallout, will be washed out of the sky by rain, and particles in seawater will sink to the seafloor.
Will enough radioactive particles in seawater make it to the northwest coast of the U.S. and Canada to be a major problem? I suspect not, but it is good to do due vigilance. The problem is measuring increased levels against existing background radiation levels, which can be effected by solar flares.
In summation, I am concerned about the environmental impact of the Fukushima event on Japna. The U.S. is far enough away that anything occurring here is unlikely to be related. Actually, there is a greater danger in driving to the local supermarket than in being contaminated by fallout from Fukushima.