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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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