Evaluation of air photoactivation at linear accelerators for radiotherapy

Journal of Radiological Protection : Official Journal of the Society for Radiological Protection
L TanaF D'Errico

Abstract

High-energy x-rays produced by radiotherapy accelerators operating at potentials above 10 MV may activate the air via (γ, n) reactions with both oxygen and nitrogen. While the activation products are relatively short-lived, personnel entering the accelerator room may inhale some radioactive air, which warrants internal dosimetry assessments. This work illustrates a method based on the use of ammonium nitrate solutions for the evaluation of photon-induced air activation and for the estimate of internal doses to radiotherapy personnel. Air activation and internal dosimetry assessments based on our method are presented for some widespread radiotherapy linear accelerator models. Our results indicate that the equivalent dose to the lungs of radiotherapy personnel is negligible for beam energies below 18 MeV.

References

Nov 1, 1983·Medical Physics·P H McGinley, T A White
Apr 1, 1980·Health Physics·A F Holloway, D V Cormack
Jan 1, 2010·Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznań and Polish Society of Radiation Oncology·Alireza Naseri, Asghar Mesbahi
May 6, 2014·Radiation Protection Dosimetry·M K SaeedH W Fischer

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Citations

May 14, 2016·Radiation Protection Dosimetry·Felix HorstKlemens Zink
May 15, 2021·Journal of Environmental Radioactivity·Sixuan ZhuangHongbo Ma

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