Monte Carlo correction factors for a Farmer 0.6 cm3 ion chamber dose measurement in the build-up region of the 6 MV clinical beam

Physics in Medicine and Biology
J PenaF Gómez

Abstract

Reference dosimetry of photon fields is a well-established subject and currently available protocols (such as the IAEA TRS-398 and AAPM TG-51) provide methods for converting the ionization chamber (IC) reading into dose to water, provided reference conditions of charged particle equilibrium (CPE) are fulfilled. But these protocols cannot deal with the build-up region, where the lack of CPE limits the applicability of the cavity theorems and so the chamber correction factors become depth dependent. By explicitly including the IC geometry in the Monte Carlo simulations, depth-dependent dose correction factors are calculated for a PTW 30001 0.6 cm(3) ion chamber in the build-up region of the 6 MV photon beam. The corrected percentage depth dose (PDD) agrees within 2% with that measured using the NACP 02 plane-parallel ion chamber in the build-up region at depths greater than 0.4 cm, where the Farmer chamber wall reaches the phantom surface.

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Citations

Sep 11, 2007·Medical & Biological Engineering & Computing·D González-CastañoA Leal
Apr 19, 2007·Medical Physics·Javier PenaGuenther H Hartmann
Jun 15, 2007·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·F Sánchez-DobladoD M Gonzalez-Castaño
Jul 23, 2009·Physics in Medicine and Biology·D M González-CastañoR Capote
Aug 13, 2021·Physics in Medicine and Biology·Hyojun ParkChul Hee Min

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