Cadmium rods are used in a nuclear reactor for :

Explanation

Cadmium rods are used in a nuclear reactor for absorbing fast neutrons. Neutrons in a nuclear reactor can have different energies, and their behavior and interaction with materials vary accordingly. Fast neutrons are highly energetic and can cause unwanted reactions or increase the rate of fission in the reactor. To control and regulate the rate of fission reactions, control rods made of materials such as cadmium are inserted into the reactor core. Cadmium has a high neutron absorption cross-section, meaning it has a high probability of absorbing neutrons when they come into contact with it. By absorbing fast neutrons, the cadmium rods effectively reduce the number of available fast neutrons and help control the rate of fission reactions in the reactor. This process helps maintain a stable and controlled level of nuclear reactions, ensuring the safe and efficient operation of the reactor.