[[1]] rods is a moderator used in nuclear reactors as absorbing neutrons.

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Detailed Solution

Cadmium rods is a moderator used in nuclear reactors as absorbing neutrons.
To keep the nuclear reaction ratio at

1 : 1

and to maintain the stability of the reaction, cadmium rods are placed within the nuclear reactor. The thermal neutron absorption cross-section of cadmium is large. As a result, cadmium rods will absorb neutrons, preventing them from causing fission.

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