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Nuclear Fission and Fusion in Tamil || Fission and Fusion in Tamil
Controlled Nuclear Fission To maintain a sustained controlled nuclear reaction, for every 2 or 3 neutrons released, only one must be allowed to strike another (uranium) nucleus. If this ratio is less than one then the reaction will die out; if it is greater than one it will grow uncontrolled (an atomic explosion). A neutron absorbing element must be present to control the amount of free neutrons in the reaction space. Most reactors are controlled by means of control rods that are made of a strongly neutron-absorbent material such as boron or cadmium. In addition to the need to capture neutrons, the neutrons often have too much kinetic energy. These fast neutrons are slowed through the use of a moderator such as heavy water and ordinary water.
Some reactors use graphite as a moderator, but this design has several problems. Once the fast
neutrons have been slowed, they are more likely to produce further nuclear fissions or be absorbed by the control rod.
Spontaneous Nuclear Fission
The spontaneous nuclear fission rate is the probability per second that a given atom will fission
spontaneously - that is, without any external intervention. If a spontaneous fission occurs before the bomb is fully ready, it could fizzle. Plutonium 239 has a very high spontaneous fission rate compared to the spontaneous fission rate of uranium 235. Consideration of the spontaneous fission rate of each material is required when designing nuclear weapons.
NUCLEAR FUSION
In nuclear physics and nuclear chemistry, nuclear fusion is the process by which multiple
like-charged atomic nuclei join together to form a heavier nucleus. It is accompanied by the
release or absorption of energy, which allows matter to enter a plasma state.
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