()( )( )235230525UThHe235.0439u230.0331u 5.0122u 931.5MeV/u1.30MeV.Qmmmc=−−=−−Only the second decay process (the αdecay) is spontaneous, as it releases energy. 52. (a) The disintegration energy for uranium-235 “decaying” into thorium-232 is 235232323hHe235.0439u232.0381u 3.0160u 931.5MeV/u9.50MeV.m−=−−(b) Similarly, the disintegration energy for uranium-235 decaying into thorium-231 is
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