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CHARACTERISTIC RADIATION

Physics

CHARACTERISTIC RADIATION

1. If E of incident electron/photon > K binding energy, then the K-shell electron will be ejected from the atom.
2. Most likely: L-shell electron will drop down to fill the hole, emitted photon is termed K alpha radiation (energy = E K - E L ).
3. Less likely: M-shell electron drops down, termed K beta radiation (energy = E K - E M ).
4. L-radiation (when an electron is knocked out of the L-shell) also occurs but mostly generates heat and plays no significant part in radiology.
5. The generated X-ray photons therefore have a few discrete energy levels and constitute a spectrum that is termed the characteristic radiation.
6. Characteristic radiation is determined by atomic number and unaffected by tube voltage.


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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