Heavy water is used in reactors because its benefits are similar to light water, but since it contains deuterium atoms, its neutron absorption cross section is much lower.
Why is heavy water chosen in the nuclear reactors to slow down fast moving neutrons?
Heavy water is basically used as a moderator in nuclear reactors to slow down the neutrons, so they are captured and become effective to bring about the fission reaction. The main reason why heavy water is used as a moderator is because it captures less neutrons than the normal water.
Why is heavy water chosen in a nuclear reactor?
Moderator is required in a Nuclear reactor to slow down the neutrons produced during the fission reaction so that the chain reaction can be sustained. Heavy Water is an excellent moderator due to its high moderating ratio and low absorption cross section for neutrons.
Why is heavy water used as a moderator in thermal nuclear reaction?
In nuclear reactors, heavy water is generally used as a moderator because unlike normal water, which absorbs neutron, it slows down neutron without absorbing it.
Why is heavy water used as a moderator in a nuclear reactor Class 12?
It is used as a moderator in some nuclear reactors because it slows down neutrons easily and effectively also and has a low chance of absorption of neutrons.
Why water is used to slow down neutrons?
Hydrogen works well as a neutron moderator because its mass is almost identical to that of a neutron. This means that one collision will significantly reduce the speed of the neutron because of the laws of conservation of energy and momentum.
Is heavy water prepared by exhaustive electrolysis of water?
Heavy water is the oxide of deuterium (D2O) and is formed from ordinary water by exhaustive electrolysis of water containing 3% NaOH. As a result of repeated electrolysis of ordinary water, protium is liberated at the cathode in preference to deuterium. … 100% heavy water is obtained.
What is the function of heavy water in a nuclear reactor Mcq?
Heavy water is used in nuclear reactors because it acts as a moderator in slowing down the neutrons that are produced during the fission reaction. This further helps in sustaining the chain reaction allowing the nuclear reactor to operate efficiently and with stability.
How does heavy water produce ordinary water?
An alternative method exists when water is electrolyzed to make oxygen and hydrogen that contains normal gas, along with deuterium. The hydrogen is then liquefied and distilled to separate the two components, then the deuterium is reacted with oxygen to form heavy water.
Why D2O is called heavy water?
In heavy water, each hydrogen atom is indeed heavier, with a neutron as well as a proton in its nucleus. This isotope of hydrogen is called deuterium, and heavy water’s more scientific name is deuterium oxide, abbreviated as D20.
Is Heavy water is more associated than ordinary water?
Heavy water is used as a moderator in nuclear reactors. Its boiling point is higher as compared to the ordinary water. Thus, it is more associated as compared to ordinary water. The dielectric constant is however higher for H2O, thus, H2O is a more effective solvent than heavy water (D2O).
What is the coolant in a nuclear reactor?
A substance circulated through a nuclear reactor to remove or transfer heat. The most commonly used coolant in the United States is water. Other coolants include heavy water, air, carbon dioxide, helium, liquid sodium, and a sodium-potassium alloy.
Which isotope is used as moderator in nuclear reactors?
B5 isotope is used as moderator in nuclear reactors.
Is water used as moderator in nuclear reactor?
Hint: In a nuclear reactor, a process like nuclear fission occurs, where neutrons move very fast, so, water is used as a moderator to slow down the neutrons, so that the nuclear reaction sustains for efficient output.
Why is graphite used as a moderator in nuclear reactors?
The graphite bricks act as a moderator. They reduce the speed of neutrons and allow a nuclear reaction to be sustained.