Production of photonuclear particles in a tissue-equivalent medium has been calculated for linacs at 6, 10 and 15MV from Varian TrueBeam. Based on the knowledge of bremsstrahlung fluence spectra and linac photon beam parameters, numerical integration was performed on the cross sections for photoparticle production of the constituent elements of tissue (2H,12C,13C,16O,17O,18O,14N,15N). At 15 MV, at the depth of photon maximum dose, the total absorbed dose due to neutrons, protons, alphas and residual nuclei from photon reactions in tissue (5.5E−05 Gy per Gy of photons) is comparable to that due to neutrons from accelerator head. Results reasonably agree with data reported in the literature using Monte Carlo models simulating linac head components. This work suggests a simple method to estimate the dose contributed by the photon-induced nuclear particles for high-energy photon beams produced by linacs in use, as it might be relevant for late stochastic effects.

Calculation of nuclear particles production at high-energy photon beams from a Linac operating at 6,10 and 15 MV / R. Marchesini, D. Bettega, P. Calzolari, E. Pignoli. - In: RADIATION PROTECTION DOSIMETRY. - ISSN 1742-3406. - 174:4(2017 May), pp. 471-477.

Calculation of nuclear particles production at high-energy photon beams from a Linac operating at 6,10 and 15 MV

D. Bettega
Secondo
;
P. Calzolari
Penultimo
;
E. Pignoli
Ultimo
2017-05

Abstract

Production of photonuclear particles in a tissue-equivalent medium has been calculated for linacs at 6, 10 and 15MV from Varian TrueBeam. Based on the knowledge of bremsstrahlung fluence spectra and linac photon beam parameters, numerical integration was performed on the cross sections for photoparticle production of the constituent elements of tissue (2H,12C,13C,16O,17O,18O,14N,15N). At 15 MV, at the depth of photon maximum dose, the total absorbed dose due to neutrons, protons, alphas and residual nuclei from photon reactions in tissue (5.5E−05 Gy per Gy of photons) is comparable to that due to neutrons from accelerator head. Results reasonably agree with data reported in the literature using Monte Carlo models simulating linac head components. This work suggests a simple method to estimate the dose contributed by the photon-induced nuclear particles for high-energy photon beams produced by linacs in use, as it might be relevant for late stochastic effects.
neutron dose; photonuclear particles;
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/557377
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