X rays

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• X rays
• Contents
• Discovery/Production of X-rays
• Energy of X-rays
• Whiteboard
• Sample x rays
• X-Ray Spectra

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Discovery of X-rays
Electrons striking anode give off radiation that
exposes film Radiation is penetrating
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Energy of X-rays
Bremsstrahlung - photons given off by
acceleration of charged objects Kinetic energy
turns in to heat and X-rays on impact Potential
photon energy heat qV hf eV hc/?min e -
electron charge V - accelerating potential ?min -
minimum wavelength produced
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Whiteboards X-ray energies 1 2
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What is the minimum wavelength produced by an
X-ray tube operating at 6800 V?
eV hc/?min ?min hc/eV (6.626 x 10-34
Js)(3.00 x 108 m/s)/(1.602 x 10-19 C)/(6800 V)
.18 nm
W
.18 nm
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What must be the operating potential of an X-ray
tube to create a .012 nm photon?
eV hc/?min V hc/e?min (6.626 x 10-34
Js)(3.00 x 108 m/s)/(1.602 x 10-19 C)/(.012 x
10-9 m) 1.0 x 105 V
W
1.0 x 105 V
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X-ray spectra
The spikes are characteristic of the material the
anode is made of K? - transitions from 2 to 1 K?
- transitions from 3 to 1 Confirmation of atomic
number
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