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boron or cadmium control rods.
control rods
Well, as nuclear reactors are nuclear reactors, nuclear reactors are not used inside nuclear reactors.
Boron is used inside a nuclear reactor inside a control rod which is used to 'soak' up the neutrons inside the nuclear reactor, a control rod can be used to control the rate of fission inside a nuclear reactor.
Usually boron and its compounds as well as cadmium are used for absorbing unnecessary neutrons.
Boron is the most commonly used, cadmium can also be used
The graphite used in graphite moderated nuclear reactors is produced in the same type of electrical furnace as is used to produce ordinary graphite, except there must be no boron in any part of the furnace.
Boron is used to make alloy as Boron steel which is used to protect radiation from nuclear reactor in Nuclear plants.
Current nuclear reactors rely on nuclear fission as their nuclear reaction.
We use nuclear fission in nuclear reactors to tap nuclear energy.
No, at least not for power reactors
There may be Radium, Thorium, Uranium or even Plutonium which can be used in nuclear reactors.