Hello, I need some help understanding this. http://atom.kaeri.re.kr/cgi-bin/decay?U-238 A it says that 79% of the time U-238 goes to the ground state of Th-234 emitting a 4.198 MeV alpha ray. But the difference between the ground state of U-238 and Th-234 is more than 4.198 MeV. What happened to the rest of the decay energy? Does it have anything to do with uncertainties? Thanks.