93 37 Rb 93 38 Sr 93 39 Y 93 40 Zr 93 41 Nb 140 55 Cs 140 56 Ba 140 57 La 140 58 Ce E_Decay m_Rb   93 m_Nb   93 4  m_electron 931.5MeV amu 92.91699 amu 92.90638 amu 4   0.0005486 amu 931.5  MeV amu 0.008416 amu 931.5  MeV amu 7.84  MeV ENERGY RELEASE FROM FISSION DOE-HDBK-1019/1-93 Atomic and Nuclear Physics NP-01 Page 60 Rev. 0 The total energy released per fission will vary from the fission to the next depending on what fission products are formed, but the average total energy released per fission of uranium-235 with a thermal neutron is 200 MeV. As  illustrated in the preceding example, the majority of the energy liberated in the fission process is released immediately after the fission occurs and appears as the kinetic energy of the fission fragments, kinetic energy of the fission neutrons, and instantaneous gamma rays.  The remaining energy is released over a period of time after the fission occurs and appears as kinetic energy of the beta, neutrino, and decay gamma rays. Estimation of Decay Energy In  addition  to  this  instantaneous  energy  release  during  the  actual  fission  reaction,  there  is additional energy released when the fission fragments decay by     emission.  This additional - energy is called decay energy, E . The decay chains for rubidium-93 and cesium-140 are Decay shown below. The energy released during the decay for each chain will be equivalent to the mass difference between the original fission product and the sum of the final stable nuclide and the beta particles emitted.   The energy released in the decay chain of rubidium-93 is calculated below.