The experimental energy spectrum of tungsten anode using tube potentials of 80 kVp and 100kVp with exposure of 0.2 mA over 2 minutes and additional aluminum filter of 3.04 mm thick. The maximum electron energies of the curves end at 80 keV and 100 keV respectively. The 100 kVp curve has higher proportion of X-ray photons produced at higher energy levels. The effective energy, representing the overall energy of the polychromatic X-ray beam, is approximately 30 to 40% of the kVp applied to the X-ray tube.
Higher kVp also produces a higher intensity of the characteristic X-ray energies. Kα is the characteristic radiation emitted when electrons fall from L-shell to K-shell. Kα2 has lower energy than Kα1 because electrons fall from slightly lower orbitals in L-shell when compared with Kα1. Meanwhile, Kβ1 is the energy of the characteristic radiation emitted when electrons fall from M-shell to K-shell, while Kβ2 is the energy difference between N-shell to K-shell.
Overall, Kβ have higher energy but lower probablity of ocurrence than the Kα.
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