Names that start with LE or HE are Low-Enriched and High-Enriched fuel rods, you can turn say LEA-242 fuel rod into CM-246 and PM-147 by just using it in a reactor and using a decay meter to check how much fuel is left. Burn it down below 30% and put the fuel rod in a reprocessor to extract the waste product and isotope

Bit confusing. I know that raw uranium and raw thorium have a chance to give U-238, U-235 Th-232 And u-233. But what are all of the other isotopes below them? Like. Is leu 235 a fuel rod? and if yes what do you use to turn it into am-242 or pm-147?