Question

Which element is used as moderator in nuclear reactor

Answer 1

The hydrogen element of the water is used as moderator in the nuclear reactor.

- The nuclear reactor is totally based upon the spontaneous nuclear reactions. (Mainly nuclear fission)

- In this nuclear reactions,large number of high velocity neutrons are produced.

- To control the speed of the neutrons to get a desired rate of nuclear reaction we use water as the moderator substance.

- This moderator substance or water has large hydrogen atoms which collide with the produced neutrons to slow them down.

Answer 2

Heavy water and graphite are used as moderator in nuclear reactor.

Explanation:

• Heavy water is made from the isotope of hydrogen which is deutarium. Heavy water is used in nuclear reaction because it acts as a moderator as well as a coolant.  

• It is the best accepted moderator in nuclear reaction. Graphite is also used as a moderator in nuclear reaction.

• Moderators accept the neutrons which are formed by the breakdown of radioactive substance like uranium 237.  

• As a result it prevents the hazardous reaction in a ‘nuclear reactor’.

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