Significance of Bremsstrahlung
Example in X-ray generators:
1.5418‰ (8KeV) X-rays are produced in great quantity when we shoot fast electrons at a copper target
BUT: we also get a lot of radiative transfer of energy from the electrons as the move past the copper atoms. This gives rise to Bremsstrahlung, which has no characteristic energies.
Thus the spectrum is like this: