?-rays, X-ray Tube and X-ray Circuit
?A photon of EMR with energy of 59.3 keV would fall well within the
?X-ray region of the electromagnetic spectrum and would be known as
?a 'K-alpha emission'.For tungsten K-shell emission, it givesIn
?such a case, the energy of the emission arising from the interaction
?would equal the difference in binding energies between the K-orbital
?electron (69.5 keV) and the M-orbital electron (2.5 keV), i.e. approxi-
?mately 67 keV.?It should be clear at this stage that irrespective of the energy of the
?incoming electron, provided that energy is greater than the binding
?energy of the shell-bound electron, removal of that electron will always
?lead to the production of X-rays which fall into well-defined energy
?bands.More to the
?point, useful X-rays can be produced using this process, providing the
?target material has a high enough atomic number and the tube voltage
?is above 70 KeV.Wherever a K-alpha series of characteristic
?radiations is produced in tungsten, there will always be an L-series
?of emissions and an M-series of emissions (through to the last shell).This emission would be known as a K-beta X-ray
?photon.?2.?3.