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Why moderators are used in nuclear process?

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Why moderators are used in nuclear process?

(a) To absorption of neutrons

(b) To increase the reaction rate

(c) To provide collision

(d) To increase the temperature

The question was asked in an internship interview.

Enquiry is from Inorganic Chemical in chapter Inorganic Chemical Industries of Chemical Technology

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Correct option is (a) To absorption of neutrons

Easiest explanation: Moderating materials are required if the absorption of neutrons is to take place at or near the environmental temperature of the reactor. The fission neutrons liberated are extremely high energy and must be moderated to environment temperature by non-absorption type collision with moderating materials.

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