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In an X-ray tube the electrons
emitted from the cathode are accelerated towards the
metal target anode by an accelerating voltage of
typically 50 kV. The high energy electrons interact
with the atoms in the metal target. Sometimes the
electron comes very close to a nucleus in the target
and is deviated by the electromagnetic interaction.
In this process, which is called bremsstrahlung
(braking radiation), the electron looses much energy
and a photon (X-ray) is emitted. The energy of the
emitted photon can take any value up to a maximum
corresponding to the energy of the incident
electron. |
The Nobel Prize in
Physics 1901 - Wilhelm Conrad Röntgen
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