Effect of the diaphragm of free-air ionisation chamber for X-ray air-kerma measurements.
Radiat Prot Dosimetry
; 146(1-3): 195-7, 2011 Jul.
Article
em En
| MEDLINE
| ID: mdl-21498414
ABSTRACT
Free-air ionisation chambers are widely used at standards laboratories as primary standards for absolute measurements of air kerma in X-ray fields. The area of the diaphragm aperture of a free-air ionisation chambers is an important factor for absolute measurements because it defines the size of the X-ray beam incident on the free-air chamber. In this study, correction factors for the contribution of X rays transmitted through the diaphragm of a free-air ionisation chamber and those scattered from the surface of the diaphragm aperture are obtained by Monte Carlo simulation for two different sized free-air ionisation chambers and for various diaphragm aperture sizes, X-ray energies and source-to-chamber distances.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Radiometria
/
Ionização do Ar
Tipo de estudo:
Health_economic_evaluation
/
Prognostic_studies
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article