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What is the most effective shape for achieving critical mass?
A sphere is the most effective shape for achieving critical mass because it maximizes the volume-to-surface-area ratio, allowing for efficient packing of material. This shape ensures that the most material is concentrated in the core, leading to a faster accumulation of mass and initiation of a chain reaction.
Critical mass depends on what?
The Purity && The Shape AND size density
Does critical mass depend on polarity?
No, critical mass does not depend on polarity. Critical mass is simply the amount of fissile material needed to sustain a nuclear chain reaction. Polarity, which is a property of molecules, does not play a role in determining critical mass.
What is the critical mass of plutonium?
Critical mass of a perfect sphere: 239Pu: 10 kg 240Pu: 40 kg 241Pu: 12 kg 242Pu: 75-100 kg
What is the minimum mass of a fissionable isotope in which a nuclear chain reaction can occur?
A critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction. The critical mass of a fissionable material depends upon its nuclear properties (e.g. the nuclear fission cross-section), its density, its shape, its enrichment, its temperature and its surroundings.The minimum mass for a particular fissionable isotope will always be a sphere, as that is the shape which will lose the least neutrons for a given mass. The behavior of a sphere can be affected by its surroundings, if a neutron reflector is present this will reduce the amount needed. The easiest way to compare materials is to consider a bare sphere with no reflector. In this case Uranium 235 requires a mass of 52 kg and a sphere of diameter 17 cm. Plutonium 239 requires a mass of 10 kg and a sphere 9.9 cm diameter.The Wikipedia article 'Critical Mass' gives a table of other isotopes, but the above two are of most practical interest
What is the most effective shape for achieving critical mass?
A sphere is the most effective shape for achieving critical mass because it maximizes the volume-to-surface-area ratio, allowing for efficient packing of material. This shape ensures that the most material is concentrated in the core, leading to a faster accumulation of mass and initiation of a chain reaction.
What is upper sub-critical limit for U235 mass?
The critical mass depends on the shape; I don't think there is an upper limit to that.For the case of a sphere, the critical mass for U-235 is 52 kg. The corresponding diameter of the sphere is 17 cm.
What is the smallest amount of radioactive material that will support a self sustained reaction?
The smallest amount of radioactive material that can support a self-sustained nuclear reaction is called the "critical mass." This mass varies depending on the type of fissile material, such as uranium-235 or plutonium-239, and the configuration of the material. For instance, the critical mass for uranium-235 in a spherical shape is about 52 kilograms. This threshold is crucial for achieving a sustained chain reaction in nuclear fission.
What is not a factor in determining critical mass is?
The color of the bicycles is not a factor in determining critical mass. Critical mass refers to the minimum number of participants needed for a collective action to be effective, typically in the context of a protest or demonstration involving cyclists. The factors that do influence critical mass include the number of participants, their level of commitment, and the visibility of the event.
Critical mass depends on what?
The Purity && The Shape AND size density
What is the most effective way for organized groups to shape public?
using the mass media
What is the most effective way for organized groups to shape public opinions?
using the mass media
Does critical mass depend on polarity?
No, critical mass does not depend on polarity. Critical mass is simply the amount of fissile material needed to sustain a nuclear chain reaction. Polarity, which is a property of molecules, does not play a role in determining critical mass.
When was Critical Mass - Catholic rock - created?
Critical Mass - Catholic rock - was created in 1996.
What is the amount of fissionable material required to continue a reaction at a constant rate?
The amount of fissionable material required to sustain a nuclear reaction at a constant rate is determined by the material's critical mass. The critical mass is the minimum amount of fissionable material needed to sustain a chain reaction, and it varies depending on the material and the reactor design. By controlling factors such as neutron moderation and absorption, reactor operators can adjust the critical mass to maintain a steady reaction rate.
What is the critical mass of plutonium?
Critical mass of a perfect sphere: 239Pu: 10 kg 240Pu: 40 kg 241Pu: 12 kg 242Pu: 75-100 kg
What is the minimum mass of a fissionable isotope in which a nuclear chain reaction can occur?
A critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction. The critical mass of a fissionable material depends upon its nuclear properties (e.g. the nuclear fission cross-section), its density, its shape, its enrichment, its temperature and its surroundings.The minimum mass for a particular fissionable isotope will always be a sphere, as that is the shape which will lose the least neutrons for a given mass. The behavior of a sphere can be affected by its surroundings, if a neutron reflector is present this will reduce the amount needed. The easiest way to compare materials is to consider a bare sphere with no reflector. In this case Uranium 235 requires a mass of 52 kg and a sphere of diameter 17 cm. Plutonium 239 requires a mass of 10 kg and a sphere 9.9 cm diameter.The Wikipedia article 'Critical Mass' gives a table of other isotopes, but the above two are of most practical interest
