Projected paths of the radioactive atmospheric plume emanating from the Fukushima reactors, best described as airborne particles or aerosols for 131I, 137Cs, and 35S, and subsequent atmospheric monitoring showed it coming in contact with the North American continent at California, with greatest exposure in central and southern California. Government monitoring sites in Anaheim (southern California) recorded peak airborne concentrations of 131I at 1.9 pCi m−3Anaheim is where Disneyland is located.
EneNews summarizes the data:
Corona Del Mar (Highest in Southern California)In addition, radioactive debris is starting to wash up on the Pacific Coast. And because the Japanese are burning radioactive materials instead of disposing of them, radioactive rain-outs will continue for some time … even on the Pacific Coast.
Santa Cruz (Highest in Central California)
- 2.5 Bq/gdwt (gram dry weight)= 2,500 Bq/kg of dry seaweed
Simon Fraser University in Canada also tested North American seaweed after Fukushima:
- 2.0 Bq/gdwt = 2,000 Bq/kg of dry seaweed
- “In samples of dehydrated seaweed taken on March 15 near the North Vancouver SeaBus terminal, the count was zero; on March 22 it was 310 Bq per kilogram; and by March 28 it was 380 Bq/kg.” -Vancouver Sun
- Seaweed in Seattle also tested positive for iodine-131; levels were not reported -KIRO
- No results after March 28 were reported