The contribution of secondary heavy particles to the absorbed dose from high-energy photon beams.
Phys Med Biol
; 41(12): 2643-56, 1996 Dec.
Article
em En
| MEDLINE
| ID: mdl-8971975
ABSTRACT
High-energy photon radiotherapy sources produce non-negligible numbers of secondary heavy particles (neutrons, protons and alphas) which contribute to the dose in a patient. They also present a radiation protection problem. The contribution of such particles to the absorbed dose in a tissue-like medium and to the equivalent dose is considered in this study experimentally. Track etch detectors were chosen as a basic type of measuring instrument cellulose nitrate Kodak LR115 and polyallyldiglycol carbonate CR39 were used as detectors. Several methods of directly read datum (track density, track parameter, LET spectrum etc) interpretation have been analysed. It has been ascertained that the contribution of secondary heavy particles represents approximately 0.002 of the photon dose and 0.02 of the equivalent dose, both at 50 MeV as maximum photon energy. The contribution of a 20 MV bremsstrahlung beam is roughly one-fifth of that at 50 MV.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Dosagem Radioterapêutica
/
Radioterapia de Alta Energia
/
Fótons
/
Imagens de Fantasmas
Limite:
Humans
Idioma:
En
Revista:
Phys Med Biol
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
República Tcheca