is equal to (194.177) / (931.49) = 0.209. In the laboratory it is confirmed that using thermal neutrons , the Total Kinetic Energy (TKE) of fission fragments that results from U-235 and Pu-239 is 29.4-37.8 MeV, less than the Q-value of reaction predicted by Einstein’s equation E=mc2 (200MeV for U235), (i.e.