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  4. Cadmium in a nuclear reactor acts as:

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Q. Cadmium in a nuclear reactor acts as:

Bihar CECEBihar CECE 2003

Solution:

(a) Nuclear fuel- Enriched $U ^{235}$ in form of $U _{3} O _{8}$
(b) Neutron absorber- Cd or B rods.
(c) A moderator- $D _{2} O$ or graphite.
Neutrons are absorbed by Cd or B rods to control the reaction.