Uranium 235 (92U235) and slow Neutrons.
In actuality, a spontaneous fission event begins a nuclear chain reaction. It kick starts a nuclear chain reaction. And a neutron from that fission will initiate another fission to continue and rev up that nuclear chain reaction.
Nuclear fission is used in nuclear weapons to create what some might call an atomic blast (nuclear blast). Nuclear fission used this way can also be applied in special complex designs to generate enough thermal energy (heat) to initiate a fusion reaction. This creates an even bigger nuclear blast.
A neutron trigger is used in nuclear fission reactions to initiate the splitting of atomic nuclei. By emitting neutrons, the trigger can start a chain reaction in which other nuclei are split, releasing more neutrons and energy. This process is fundamental to the operation of nuclear reactors and nuclear weapons.
The exact amount of energy needed to initiate a nuclear fission reaction can vary depending on the specific isotopes involved. In general, a minimum amount of energy called the critical energy is required to overcome the forces holding the nucleus together and initiate the fission process. This critical energy can be provided by various methods including using a neutron source or through spontaneous fission events.
Nuclear fission reactions in certain atoms can be initiated through processes such as bombarding the atoms with neutrons or by using controlled conditions that allow for the splitting of atomic nuclei. These processes can trigger a chain reaction leading to the release of energy, which can be harnessed for various applications, including nuclear power generation.
In actuality, a spontaneous fission event begins a nuclear chain reaction. It kick starts a nuclear chain reaction. And a neutron from that fission will initiate another fission to continue and rev up that nuclear chain reaction.
You have to build a nuclear reactor which is an assembly of nuclear fuel and a moderator, which enables a chain fission reaction to start and continue, which releases thermal energy.
Nuclear fission is used in nuclear weapons to create what some might call an atomic blast (nuclear blast). Nuclear fission used this way can also be applied in special complex designs to generate enough thermal energy (heat) to initiate a fusion reaction. This creates an even bigger nuclear blast.
Neutrons are the important particles of nuclear chain reactions and the reactions depend on them. The neutrons do not really start the fission, reaction, however, because the neutrons come from fission in the fuel.The material in the fuel, typically a mix of 235U and 238U, undergoes fission spontaneously. When a fission event happens, more neutrons, typically two or three, are emitted. These bounce about from atom to atom, until they cause another atom to undergo fission, releasing more neutrons to increase the rate at which atoms undergo fission.But the neutrons needed for the chain reaction are actually produced by the fuel spontaneously, and these are produce in an ongoing manner with or without critical mass. So it is not a particle that starts the chain reaction; it is the act of putting together a critical mass.
If you are asking which has the maximum danger, a hydrogen bomb is one type of nuclear bomb. In general, nuclear bombs can be fission (called atomic) or fusion (hydrogen) A fusion bomb is larger than an fission bomb, and actually uses a fission bomb to start the fusion reaction.
A neutron trigger is used in nuclear fission reactions to initiate the splitting of atomic nuclei. By emitting neutrons, the trigger can start a chain reaction in which other nuclei are split, releasing more neutrons and energy. This process is fundamental to the operation of nuclear reactors and nuclear weapons.
The exact amount of energy needed to initiate a nuclear fission reaction can vary depending on the specific isotopes involved. In general, a minimum amount of energy called the critical energy is required to overcome the forces holding the nucleus together and initiate the fission process. This critical energy can be provided by various methods including using a neutron source or through spontaneous fission events.
Nuclear fission reactions in certain atoms can be initiated through processes such as bombarding the atoms with neutrons or by using controlled conditions that allow for the splitting of atomic nuclei. These processes can trigger a chain reaction leading to the release of energy, which can be harnessed for various applications, including nuclear power generation.
In a nuclear power plant and in nature in (low levels.) With any form of radioactive decay it is possible for atoms to be split. The sustained reaction is the foundation of both nuclear weapons and nuclear power plants where the fission is self-sustaining for a period of time. A simple physical model is a pool (billard) table when you initally break. The cue ball is a small particle that breaks up the racked balls. Now imagine hundreds if not millions of other racked balls. A chain reaction of breaks continues until there isn't enough energy to stustain the fission of atoms. Low levels of this happen all the time with radioactive material in nature. Once there is a "critical mass" of very specific radioactive material a sustained chain reaction happens. Controlled you can get nuclear power by siphoning the reaction in the form of heat to turn turbines for power, let it all go at once and you get a nuclear bomb. Fission is the splitting of atoms, fusion is merging atoms. A hydrogen bomb uses both fission and fusion. Fission to start the reaction (Plutonium) and an outer shell that (Cesium,cobalt, if memory serves me correctly were two material used for the outer casing), from the force of the fission, causes the fusion of hyrodgen (hence H-Bomb).
The metal fuel rods inside a nuclear reactor must be bombarded with neutrons in order to start a chain reaction. This process triggers the fission of uranium atoms in the fuel rods, releasing energy in the form of heat.
Only beacuse of starting trouble. Any way we need billion kelvin temperature to start with for which we have to rely on fission reaction. One more important point we cannot have a controlled fusion reaction as we do so in fission ie nuclear reactor using control rods.
1. The material for enrichment is the uranium hexafluoride (UF6) not uranium dioxide pellets. 2. For a nuclear fission and and a nuclear chain reaction we need thermal neutrons.