Re: Charlie Clark
Congratulations on having the same grasp of chemistry and physics as a medieval alchemist.
S-level, since you ask, but a long time ago. Alpha sources aren't too hard to get, but targetting nuclei and getting reliable changes (relying on quantum effects) are why this isn't comparable with chemistry.
Au is also only "a couple of numbers" away from Pb
Au is 79, Pb is 82 for a start for that kind of transmutation you also want a stable isotope. IIRC Pt (78) to Au has been demostrated but seeing as platinium is rarer and more expensive than gold… Back to school for you, laddie!