Often it is said that Bell's theorem (and the observed violations thereof) rules out local hidden variable theories as the explanation for the seeming non-determinism found in quantum mechanics. I'm wondering if this extends also specifically to radioactive decay processes. So I guess this is really a question of whether the radioactive decay processes are currently understood to a level so that one can say that the seeming randomness boils down to some well-known quantum phenomena that would be covered by Bell's Theorem. Or, alternatively, that the decay processes are not understood to the extent that they are reducible to quantum phenomena and hence could have a different explanation. For example, one could imagine radioactive nuclei being a deterministic but chaotic system of interactions going through states, where sooner or later a state is reached where the decay occurs etc. The question is if such a view, where the individual decay is actually a deterministic phenomena (but appears as random since we dont know the current state of a particular atom) is compatible with current knowledge of radioactivity and quantum mechanics.

The section https://en.wikipedia.org/wiki/Radioactive_decay#Theoretical_basis_of_decay_phenomena seems to leave the impression that the underlying mechanism of decay is not understood.