Fukushima Radioactive Seawater Computer Model

[hereonearth]

If I understand correctly, that "plume" is based on tracers added to the debris that sent a signal when it came in contact with a radioactive substance. It doesn't mean that it is still radioactive but shows exactly where the ocean currents are carrying them. Still quite disturbing and possibly still radioactive. They are, in their own words,"trying to track where the radionuclides are spreading as it will eventually climb up the food chain." Seems to me that they are concerned about our food supply.