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Electron Acceleration and X-Ray Emission in X-Ray Machines
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[QUOTE="Choppy, post: 5504529, member: 127425"] I think the result that you're after essentially comes down to the fact that the power emitted by a point charge under acceleration or deceleration is proportional to the square of its acceleration. Look up the [URL='https://en.wikipedia.org/wiki/Larmor_formula']Larmor formula[/URL] if you want the details. So you're right that the distances over which the electron moves make the difference. The potential difference in an x-ray tube will accelerate electrons across a gap of ~10 cm or more. But then they strike a target material, the electrons decelerate over a very small distance. A 100 keV electron has a range of about 15 microns in Tungsten. So you're looking at a ratio of distances on the order of 10^4 under which an electron gains or loses it's energy. So I would guess the radiated power difference would be on the order of 10^8! And that's probably an underestimate given that the electron's path in the metal is not really a constant slowing, but rather brief instances of hard breaking interspersed within longer straighter path segments. [/QUOTE]
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Electron Acceleration and X-Ray Emission in X-Ray Machines
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