Nuclear Power Engineering
A control rod

Both B and C
Should have small absorption cross-section
Is generally made of boron, hafnium or cadmium
Should have large absorption cross-section

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Nuclear Power Engineering
The main purpose of control rod in a nuclear reactor is to control the

Emission of hazardous radiation
Conversion of fissile material into fertile material
Velocity of the secondary neutrons
Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission

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