Question

of what material are the control rods of nuclear reactor​

Answer 1

Answer:

The rods may be of any overall shape and may contain any of a number of neutron-absorbing materials including rare earths as well as Hf, B, Li, and Co. In general the rods consist of a core of epithermal neutron-absorbing material, a layer of thermal neutron-absoibing material, and a corrosion-protection cladding.

Answer 2

Answer:

hafnium

A rod, plate, or tube containing a material such as hafnium, boron, etc., used to control the power of a nuclear reactor. By absorbing neutrons, a control rod prevents the neutrons from causing further fissions