Fukushima and the West Coast
Opinion varies but many people who live on the US West Coast are concerned about radiation from the Fukushima disaster. Some are concerned about other parts of the Pacific coast of the Western Hemisphere.
News on dangers is all over the map. Well, I just found a a web site called Fukushima Shield that seems to be a good resource. By resource, what I mean is that it has some content but also lots of links to other content.
Opinion still will vary all over the place (the scariest concern seems to be eating fish from the Pacific) but it is a good place to start looking for more information.
If you think you are safe in Nicaragua, I did see one map that shows radiation distributed down to the coast of Chile.