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One or more elements that strongly absorb neutrons, some are:cadmiumboronhafniumetc.
Radioisotopes for many uses (e.g. medical, industrial, scientific) are produced in nuclear reactors.
In some reactors it is, depends on the design.
The most common coolant used in nuclear reactors is water. There are light water reactors (using "regular" water), and the heavy water kind of reactor.
It is Uranium
control rods
Well, as nuclear reactors are nuclear reactors, nuclear reactors are not used inside nuclear reactors.
boron or cadmium control rods.
In most reactors in the world, water is used to absorb heat released from the reactor.
control rods
One or more elements that strongly absorb neutrons, some are:cadmiumboronhafniumetc.
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
Liquid sodium has been used as a coolant in fast reactors, because it does not slow down and absorb fast neutrons. It does not control the nuclear reaction directly, for that variable neutron absorbers are required.
There may be Radium, Thorium, Uranium or even Plutonium which can be used in nuclear reactors.
No substitute for nuclear power reactors especially if there is no available fossil fuel.