I am wondering if anyone has considered this could be used in RTG's? To make Am242m one needs spent fuel that's been sitting around for a while, this has let the Pu241 decay to Am241. The question is, once you separate Am-241, can you run the reactor to favor Am242m production? Am242m is the only isotope that doesn't emit hard gamma rays and has a positive energy curve over its half life. It decays to Curium 242 and Pu238 which give 12Mev energy(double Pu238). Another problem is Curium has a SFx10 of Pu238.