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Any particular decay process is associated with a change from one energy state to another, so its emitted particles will have a specific energy. Charts of the nuclides will give this energy for any particular decay event. See also the extract from Wikipedia article on 'Radioactivity', below. You can view the whole article on the link attached.

'Radioactive decay results in a reduction of summed rest mass, which is converted to energy (the disintegration energy) according to the formula E = mc2. This energy is released as kinetic energy of the emitted particles. The energy remains associated with a measure of mass of the decay system invariant mass, inasmuch the kinetic energy of emitted particles contributes also to the total invariant mass of systems. Thus, the sum of rest masses of particles is not conserved in decay, but the system mass or system invariant mass (as also system total energy) is conserved.'

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