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nuclear engineering - What is the minimum amount of fissile mass . . . A critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction No mention is made of a neutron moderator in this definition If critical mass is defined like this, then that should allow infinite moderator material to be used if doing so would lead to the minimum amount of fissile material
Formula for critical mass? Critical mass of polonium? If calculating critical mass were easy, we'd have a lot of physicists out of work :- ( -- or alternatively, the Nazis would have had a working bomb long before 1944 The calculation of critical mass has an explanatory simple equation For in excess of diametric atoms in atomic stages vary without most of things seemingly equaling the same
Does every element have a critical mass? - Physics Stack Exchange We have all heard of critical mass for radioactive materials like Uranium, Plutonium etc but does every element theoretically have a critical mass? If not, what determines if such a phenomena is
Critical mass (radius) of U235 - Physics Stack Exchange The equation ( sin B r) r leads to a critical radius of 3 14 x diffusion length and far too large a figure i e giving critical mass 200 Kg as opposed to 50 Kg The reason for this is that the premiss on which the Helmholtz equation was formulated is that the fission material is of infinite length and a small cross-section examined What the first equation is saying is that the material is
Why does nuclear fuel not form a critical mass in the course of a . . . So even if a critical mass forms in meltdown, a reactor does not have the geometry and purity for a nuclear bomb No mushrooms But it may continue to heat, acting as a reactor, and the problem is in conveying the heat away without building up steam and hydrogen in order to avoid a chemical explosion
Would a uranium 235 fuel pellet the size of Earth explode? 13 A critical mass of U-235 fuel is only 17 centimeters in diameter and weighs 52 kilograms A sphere of U-235 the size of the earth would be impossible to assemble because it would go critical and explode long before you could get it that big
Derivation of Critical Mass of U-235 - Physics Stack Exchange I am having trouble following an explanation of the critical mass of U-235 from my book (for high school physics) First off, every chain reaction of U-235 releases on average $\\nu = 2 42$ neutrons
How does the shape of a radioactive material effect its critical mass? the critical mass of a chunk of fissionable material is sensitively dependent on its shape Any shape that is nonspherical will have a higher critical mass than that of a sphere of the same material For example, in fission bomb design, it is a common technique to begin with a mass of plutonium which is oblate and subcritical and then use explosives to force it into a spherical shape, at which