GK
NUCLEAR SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Uraphite
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Helium gas
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Heavy water
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All of the above
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Detailed explanation-1: -Cadmium rods are used as moderators in a nuclear reactor.
Detailed explanation-2: -The commonly used moderators are water, heavy water (D2O) and graphite. This reduces the speed of fast neutrons and helps in sustaining nuclear chain reaction.
Detailed explanation-3: -Heavy water (D2O) is used as a moderator in nuclear reactor.
Detailed explanation-4: -A moderator is a material used in a nuclear reactor to slow down the neutrons produced from fission. By slowing the neutrons down the probability of a neutron interacting with 235U nuclei is greatly increased thereby maintaining the chain reaction.
Detailed explanation-5: -Thorium as a nuclear fuel. Thorium (Th-232) is not itself fissile and so is not directly usable in a thermal neutron reactor. However, it is ‘fertile’ and upon absorbing a neutron will transmute to uranium-233 (U-233)a, which is an excellent fissile fuel materialb.