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Review
. 2010 Sep 22;15(5):138-44.
doi: 10.1016/j.rpor.2010.08.003.

A review on photoneutrons characteristics in radiation therapy with high-energy photon beams

Alireza Naseri  1 , Asghar Mesbahi  2
Affiliations
Review

A review on photoneutrons characteristics in radiation therapy with high-energy photon beams

Alireza Naseri et al. Rep Pract Oncol Radiother. .

Abstract

In radiation therapy with high-energy photon beams (E > 10 MeV) neutrons are generated mainly in linacs head thorough (γ,n) interactions of photons with nuclei of high atomic number materials that constitute the linac head and the beam collimation system. These neutrons affect the shielding requirements in radiation therapy rooms and also increase the out-of-field radiation dose of patients undergoing radiation therapy with high-energy photon beams. In the current review, the authors describe the factors influencing the neutron production for different medical linacs based on the performed measurements and Monte Carlo studies in the literature.

Keywords: Neutron source strength; Neutron spectra; Photon beams; Photoneutron; Radiation therapy.

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Figures

Fig. 1
Fig. 1
Neutron spectra at different points of a typical treatment room for 15 MeV photon beam of Primus linac (the spectra was derived from the study of Pena et al.).
See this image and copyright information in PMC

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