It is without doubt a critical gaps in information. We need to know first how much radionuclides already exist in the ocean (per volume), and where those comes

It is without doubt a critical gaps in information. We need to know first how much radionuclides already exist in the ocean (per volume), and where those comes from. All combustion and mining release to some degree radioactive isotopes into the environment, and much of it ends up sooner or later into the ocean. A common popular science experiment for kids is to show water samples from different sources and store them for a few days. Most assume that rain is pretty clean, but in reality it tend to be almost comparable to untreated sewage water and one of the more nasty samples after a few days. More studies are needed is something everyone should agree on regardless on which outcome people are voting for.