FISSION CHAIN REACTION

In one fission of ₉₂U²³⁵ nucleus, about three neutrons are obtained. These fast moving neutrons undergo successive collision with the other ₉₂U²³⁵ nuclei. As more and more nuclei are broken by the neutrons, more and more neutrons are obtained and an uncontrolled fission process is started which is referred to as FISSION CHAIN REACTION. If it is not controlled, then all the ₉₂U²³⁵ atoms are broken and a large amount of energy is produced. An interesting fact which must be noted down is that no fission chain reaction will take place if the amount of uranium is less than a certain mass known as CRITICAL MASS.