https://doi.org/10.1140/epjd/e2010-00174-8
Energy deposition model for I-125 photon radiation in water
1
Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (CSIC), 28006 Madrid, Spain
2
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, Spain
3
Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, 28040 Madrid, Spain
4
Laboratório de Colisões Atómicas e Moleculares, Departamento de Física, CEFITEC, FCT-Universidade Nova de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal
5
Departamento de Física de los Materiales, Universidad Nacional de Educación a Distancia, 28040 Madrid, Spain
6
Hospital Universitario La Paz, 28046 Madrid, Spain
Corresponding author: a g.garcia@iff.csic.es
Received:
16
December
2009
Revised:
12
April
2010
Published online:
2
July
2010
In this study, an electron-tracking Monte Carlo algorithm developed by us is combined with established photon transport models in order to simulate all primary and secondary particle interactions in water for incident photon radiation. As input parameters for secondary electron interactions, electron scattering cross sections by water molecules and experimental energy loss spectra are used. With this simulation, the resulting energy deposition can be modelled at the molecular level, yielding detailed information about localization and type of single collision events. The experimental emission spectrum of I-125 seeds, as used for radiotherapy of different tumours, was used for studying the energy deposition in water when irradiating with this radionuclide.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010