User:Ayzmo/r

I'm not sure why you suggest that the dispersion of radioactive isotopes should be uniform. There are very few elements that are universal in their dispersion. If that were true than we wouldn't have "coal country" or the fight over diamonds & gold. Radioactive isotopes, just like the rest, settle in places for reasons that geologists understand much better than I. I'd imagine it has to do with a large number of factors including continental drift and volcanic activity.

As for them being in the ocean, they are. All it takes is a simple google search to tell you that. I don't intend to do a lot of research on something that doesn't particularly interest, however, short reading shows that evaporation and ocean currents are responsible for the higher concentrations on land.

As for volcanos: I think this thread is quite educative: http://www.thenakedscientists.com/forum/index.php?PHPSESSID=5tmfgmi0b5i985lfh5l4u5u9n4&topic=4358.msg34468#msg34468