Simple analytical expressions for the dose of point photon sources in homogeneous media.
Phys Med Biol
; 53(21): 6113-28, 2008 Nov 07.
Article
em En
| MEDLINE
| ID: mdl-18854613
ABSTRACT
The contributions to the dose of a point photon source in homogeneous media due to primary and first, second, ..., nth scattered photons are investigated. Assuming a simple statistical model, an analytical form comes out for each of these contributions. It includes a polynomial and a single exponential and depends on three parameters which have a physical meaning. The values of these parameters for different energies and for water, as a test case, are obtained from numerical fits to the results of a Monte Carlo simulation with the code PENELOPE. The average differences between the model and the Monte Carlo results, after the fitting process, are below 1%. Our model permits to obtain improved versions of the classical approach of Berger in a straightforward way. The expressions obtained also describe the dose build-up of the primary photons.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doses de Radiação
/
Fótons
Tipo de estudo:
Health_economic_evaluation
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article