Calculation of nuclear particles production at high-energy photon beams from a Linac operating at 6,10 and 15 MV
Articolo
Data di Pubblicazione:
2017
Citazione:
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.
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
neutron dose; photonuclear particles;
Elenco autori:
R. Marchesini, D. Bettega, P. Calzolari, E. Pignoli
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