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Phenomenological dose model for therapeutic photon beams: Basic concepts and definitions
Author(s) -
Nizin Paul S.
Publication year - 1999
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.598695
Subject(s) - monte carlo method , absorbed dose , photon , disequilibrium , physics , dosimetry , computational physics , gamma ray , nuclear medicine , statistical physics , optics , nuclear physics , radiation , mathematics , statistics , medicine , ophthalmology
A model for central‐axis absorbed dose in therapeutic photon beams is developed. An expression for absorbed dose in a unit density material, including that in the regions of longitudinal and lateral electronic disequilibrium, is derived. The model is based on the concept of primary and scatter. Primary and scatter dose components are approximated using two identical analytical functions. Monte Carlo simulated dose data for60 Co gamma rays and 15 MV x rays in water are used to test the model. The accuracy of the model is demonstrated.