Mass Defect & Binding Energy (3 of 7), Beta Decay of Cesium 137

Using mass defekt and binding energy this video explains how to determine the amount of energy released from the beta decay of Cesium 137.
The mass of an atomic nucleus is less than the sum of the individual masses of the free constituent protons and neutrons, according to Einstein's equation E = mc2. Nuclear binding energy is the minimum energy that would be required to disassemble the nucleus of an atom into its component parts. These component parts are neutrons and protons, which are collectively called nucleons. The binding energy is always a positive number, as we need to spend energy in moving these nucleons, attracted to each other by the strong nuclear force, away from each other. This 'missing mass' is known as the mass defect, and represents the energy that was released when the nucleus was formed.
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