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Moscow University Physics Bulletin

, Volume 73, Issue 6, pp 683–686 | Cite as

Empirical Law to Evaluate the Skin Dose with Photon Beam Energy and Irradiation Field Size

  • Mohamed BencheikhEmail author
  • Abdessamad Didi
  • Abdelmajid Maghnouj
  • Jaouad Tajmouati
  • Yassine Benkhouya
  • Sanae El Ouahdani
BIOPHYSICS AND MEDICAL PHYSICS
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Abstract

The objective of this study is to evaluate mathematically an empirical law governs the skin dose with photon beam energy and irradiation field size based on experiment data of dose distributions. The dose distributions were expressed on percentage depth dose (PDD). The measurements of PDDs were done as a function of irradiation field size with an uncertainty of 2% as recommended by IAEA protocols.

The skin dose corresponds to PDD at depth of 0 mm for photon beam energy of 6 and 18 MV. For these both photon beam energies, the skin dose increased linearly with irradiation field size and the skin dose rate decreased in power law as a function of irradiation field size with mathematical error under to 10%. This law allows us to predict the skin dose with irradiation field size for high radiotherapy quality and high protection of organ at risks.

Keywords:

radiotherapy skin dose PDD dosimetry linac 

Notes

ACKNOWLEDGMENTS

The authors would like to thank Varian Medical Systems to provide us the Varian Clinac 2100 geometry data and give us this opportunity to study the Varian linear accelerator technology and to participate in its future development.

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Copyright information

© Allerton Press, Inc. 2018

Authors and Affiliations

  • Mohamed Bencheikh
    • 1
    Email author
  • Abdessamad Didi
    • 1
  • Abdelmajid Maghnouj
    • 1
  • Jaouad Tajmouati
    • 1
  • Yassine Benkhouya
    • 2
    • 3
  • Sanae El Ouahdani
    • 4
  1. 1.LISTA Laboratory, Department of Physics, Faculty of Sciences Dhar El-Mahraz, University of Sidi Mohamed Ben AbdellahFezMorocco
  2. 2.Department of Radiotherapy, Al Kawtar ClinicFezMorocco
  3. 3.Nuclear Physics Laboratory, Faculty of Sciences Agdal, Mohammed V UniversityRabatMorocco
  4. 4.Faculty of Sciences, Abdelmalek Eassaâdi UniversityTetouanMorocco

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