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Electrons that travel from cathode to anode projectile electrons
Any outer shell electron can fill the void in the inner orbit CHARACTERISTIC RADIATION
distance between the filament and the anode 1-3 cm
due to ionization of K shell electrons K x-rays
Projectile electrons travel at ½ the speed of light
Ionization can occur with the other shells L, M, N, O, P
K shell x-rays are more energetic than the other x-rays because there is a greater difference in the binding energy
K shell 69 keV
Braking or slowing down radiation Bremsstrahlung
99% is thermal heat and 1% is photons ANODE HEAT
the electron gives up all or a large amount of its energy High energy bremsstrahlung
the electron did not give up much energy Low energy bremsstrahlung
greatest amount of x-rays emitted with energy approximately 1/3 the maximum of the highest energy photons Bremsstrahlung radiation
increase height of the curve and the curve shifts to the right Increase kVp
increase height of the curve Increase mAs
decreases height of the curve and the curve shifts to the right Filtration
Projectile electron loses its kinetic energy in an interaction with a nuclear field of a target atom Bremsstrahlung Radiation
At 60 kV .5% x-ray production
At 100 kV 1% x-ray production
% of the kinetic energy of the projectile electrons is converted to heat 99
Doubling the x-ray current causes the heat to double
created when projectile electrons interact with orbital electrons but there is not enough energy to remove the electrons from the target atoms (ionize the atom) and produce x-rays Anode heat
Created by: hakrrins on 2008-08-17

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