My first thought was a certain wizard king who used nuclear fusion as a power source by converting the energy into mana, practically granting him a near limitless amount of magic.
"The Wizard converts mana from the electric energies generated from Nuclear Fission (the decay of atomic metals) instead of channeling ambient radiation?"
Oh hey, something similar but with fission instead. I'd say they would get alot of mana depending on the output.
Mmm, if a wizard were to get their hands on a book that explains the nuclear physics of fission and a few rods of uranium, they would probably be confused and get cancer if the rods weren't encased or sealed to prevent radiation leakage.
Unless they have an idea on what the book is about or some basic knowledge on nuclear physics, they would be confused for a bit while being interested in both the book and rods.
Since they got magic, it wouldn't take too long for them to grab a bunch of books and delve deeper to expand their understanding of nuclear fission. It depends on what the wizard is capable of, whether they are a low tier or a high tier.
But this might be wrong, im just basing off from what I remember or currently understand