0
How is the neutron yield of an AmBe neutron source facility increased?
Wiki User
∙ 11y ago
Fission
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What is meant by supercritical andhow dose it relate to making a nuclear bomb?
subcritical - a mass or arrangement of fissionable or fissile material unable to sustain a neutron chain reaction. It can provide a fixed amount of neutron multiplication from a neutron source, but after removal of the neutron source the chain reaction rate drops exponentially.critical - a mass or arrangement of fissionable or fissile material capable of sustaining a constant neutron chain reaction. No increase or decrease. (Nuclear reactors operate at critical)supercritical - a mass or arrangement of fissionable or fissile material capable of not only sustaining a neutron chain reaction, but once initiated the chain reaction rate rises exponentially. (Nuclear fission bombs explode when made supercritical)A nuclear fission bomb must have 2 of these states: subcritical (so that it can't explode until desired) and supercritical (so that it explodes with an effective yield). This requires a rapid "assembly" system using conventional explosives to rearrange the fissile material from subcritical to supercritical in about 1ms. A neutron source starts the chain reaction and the explosion completes in about 1 microsecond.
Is a neutron bomb the most dangerous nuclear weapon?
no, yield is rather low because tungsten is used for fusion tamper instead of Uranium-238, so the fusion neutrons can escape instead of being consumed fissioning Uranium-238.
What relationship s used to determine the percent yield of a chemical reaction?
The percent yield of a reaction measures the efficiency of a reaction. The relationship of the actual yield to the theoretical yield is used to determine this.
Why cant a nuclear power plant explode like a nuclear bomb?
A fission bomb explodes because of a sudden assembly (driven by conventional explosives) of a very supercritical mass of fissile material, followed by a precisely timed neutron pulse at the optimal point of supercriticality.A fission reactor cannot do this, for the following reasons:most fission reactors do not contain fissile material, only fissionable materiala fission reactor has no mechanism for sudden assemblyof a very supercritical massfission reactors operate exactly at critical, so the reaction neither dies out nor risesfission reactors use a continuous neutron source at startup that is removed once the reactor is running, not a precisely timed pulsed neutron source like used in fission bombsif a fission reactor using fissile material did go supercritical enough (without the automatic SCRAM system shutting it down first) to get a small nuclear yield, it would be a fizzle yield only capable of melting the core and thereby instantly dissembling the supercritical massDefinitions:Fissionable material - material capable of sustaining fission, but only in presence of a moderator to slow neutrons to prevent their capture by Uranium-238 or other isotopes with large capture crosssections for fast neutronsFissile material - weapons grade material requiring no moderator and capable of fast fission. required for both bombs and fast breeder reactors.
What is the yield for a gallon of product that has a ratio of 128?
The yield for a gallon of product that has a ratio of 1:128?
How can the yield of ammonia be increased?
in the haber process its yield is increased by increasing presure
What happens to the yield of ammonia when the concentration of reactant is increased?
..
A test specimen is stressed beyond the yield point and is then unloaded its yield point will be?
increased...because the specimen is strain hardened due to plastic deformation.
How do plants maximize yield?
Plants maximize their yield by improving harvest index
How can nuclear fission be forced to happen?
by a neutron source. nuclear reactors are always started with one to avoid a supercritical power surge from damaging the reactor. nuclear bombs are always triggered by one to make sure the reaction happens at optimal supercriticality for desired yield.
What is meant by supercritical andhow dose it relate to making a nuclear bomb?
subcritical - a mass or arrangement of fissionable or fissile material unable to sustain a neutron chain reaction. It can provide a fixed amount of neutron multiplication from a neutron source, but after removal of the neutron source the chain reaction rate drops exponentially.critical - a mass or arrangement of fissionable or fissile material capable of sustaining a constant neutron chain reaction. No increase or decrease. (Nuclear reactors operate at critical)supercritical - a mass or arrangement of fissionable or fissile material capable of not only sustaining a neutron chain reaction, but once initiated the chain reaction rate rises exponentially. (Nuclear fission bombs explode when made supercritical)A nuclear fission bomb must have 2 of these states: subcritical (so that it can't explode until desired) and supercritical (so that it explodes with an effective yield). This requires a rapid "assembly" system using conventional explosives to rearrange the fissile material from subcritical to supercritical in about 1ms. A neutron source starts the chain reaction and the explosion completes in about 1 microsecond.
What is bps in economics?
BPS = basis point. Definition: A unit for measuring a bonds yield that is equal to 1/100 of 1% of yield. Also known as "bips". Same as 1/10,000 of yield (1% divided by 100). For example, if a bond goes from 5.0% yield to 5.5% yield it is said to have increased 50 bps / 50 basis points
How were some of the hunger needs of India solved?
increased per acre yield due to better farming,improved plant genetics and crop management,and increased meat supply.
Why are younger plants the best source for DNA?
The younger the plant tissue, the higher the DNA yield
What is a dial-a-yield nuclear bomb - fission or fusion?
"Dial-a-yield," or Variable Yield, is a method of adjusting the yield of a nuclear weapon through various means. While most modern high-energy weapons are thermonuclear, both fission and thermonuclear weapons can have their yield adjusted. In a boosted fission weapon (which can also be the primary to a staged radiation implosion weapon), the yield can be adjusted by changing the amount of deuterium/tritium gas that is injected into the plutonium pit, or by the timing of the external neutron initiator, or both. In a staged weapon, causing the secondary to not ignite by adjusting the yield of the primary (see above), or blocking the radiation channel in some way, can also change the yield of the weapon.
Is a neutron bomb more deadlier than a nuclear bomb?
A neutron bomb is a nuclear bomb.Specifically a neutron bomb is a modified fusion (hydrogen) bomb.In a standard fusion bomb the fusion tamper is Uranium-238. This absorbs the high energy fusion neutrons and fissions, producing roughly 90% of the yield of the fusion bomb and most of the fallout.If instead we change the fusion tamper to a different dense metal with a much much smaller cross-section for absorbing neutrons, then most of them escape. This is a "neutron" bomb. If everything else is the same, it has only about 10% of the yield and a tiny fraction of the fallout of the standard fusion bomb (making it a "clean" bomb).Sometimes the neutron bomb is considered an anti-tank weapon, as the neutrons can pass through the tank and irradiate the crew while the lower yield and fallout produce less blast damage and radiological contamination.However the high neutron flux induces secondary radioactivity in most exposed materials. This is also a form of radiological contamination, but cannot be washed off like fallout.
A nuclear fission chain reaction of U-235 starts with a slow neutron. What produces this first neutron?
Uranium is naturally radioactive; it's unstable. Somewhere in a sample of uranium, spontaneous fission occurs. All the time. Neutrons are released in this reaction. It cannot be stopped. If critical mass is assembled, a couple of neutrons will appear from a spontaneous fission somewhere within the sample, and a chain will immediately begin to build. There is no way to stop it except by separating the mass into subcritical quantities. But the reaction will do that. It happens in the twinkling of an eye. Always. Note that a so-called fast neutron, a neutron with a lot of kinetic energy, can cause fission. But it has a lot lower probability of doing that than a thermal neutron. Slowing down or "thermalizing" of neutrons increases the chance that they will be captured, and neutron capture will build a chain reaction. This was included because the question stated that a chain starts with a slow neutron, and this might not be the case. It is the slow neutrons that drive the fission chain in nuclear reactors. They have moderators to slow the neutrons down. But the fast neutrons are the chain builders in nuclear weapons. In a nuclear weapon, we don't put moderator material in the thing. We might incorporate some neutron mirrors or lenses in the geometry of the device, but we rely on the a lot of fast neutrons to carry out the mission of burning the fissile material very rapidly to get a big yield. The proof is in the pudding.
