Fukushima radioactivity used to validate ocean current models

I knew that people were tracking the radioactive plume, I just had not put it in the context that they could use the plume to validate ocean current models. Silly me. It's a good thing that there are people smarted tham me out there.

triggered tsunami damaged the Fukushima Daiichi nuclear power plant in March 2011, a team of Canadian scientists saw an opportunity to put models of Pacific Ocean current speeds to the test.

After the tsunami struck, the plant released cesium 134 and cesium 137 into the ocean. The researchers knew that a small percentage of this radioactive material would be carried by currents across the Pacific, eventually reaching the west coast of North America.

Computer models could predict when this might happen, but by taking actual samples of the ocean water and testing them for cesium 134 and cesium 137 the scientists could see for certain when it happened.
— http://www.latimes.com/science/sciencenow/la-sci-sn-fukushima-radiation-plume-20141229-story.html