Q.

In a nuclear reactor the material use for absorbing neutrons is –

A. zinc
B. radium
C. lead
D. cadmium
Answer» D. cadmium
Explanation: One isotope of cadmium, 113Cd, absorbs neutrons with very high probability if they have an energy below the cadmium cut-off and transmits them otherwise. The cadmium cut- off is about 0.5 eV. Neutrons with energy below the cut-off are deemed slow neutrons, distinguishing them from intermediate and fast neutrons.
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