Apparently, PU 238 is used in RTG's but in the mod plutonium energy. it is a waste product... interesting but I don't think anyone here is a nuclear engineer just felt like pointing out this.
TLDR nuclear fuel for RTG's and reactors is different. like being an oxide in RTG's
but after mulling over what I said. is there a way to modify the power output and halflife, to say.... 10 hours (a long game sesion) is a year such that the resulting energy would be the same as if it were 600kw for a half-life of 12 hours? just a future idea....