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Question

Calcium rods are used in nuclear reactors to slow, down the neutrons taking part in the fission process.

A
True
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B
False
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Solution

The correct option is B False
False calcium rods are not used in nuclear reactant to slow down the neutrons taking part in the fission process
In fact moderators are used to slow fast neutrons the most commonly used moderator are ordinary water and graphite the most efficient moderator is helium. The next most efficient one is heavy water (D2O) but this is so expansive that it has been used only in research reactors.
Boron or cadmium steel rods are used as control rods which absorb neutrons and there by control the rate of fission.

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