Phantom-derived estimation of effective dose equivalent from X rays with and without a lead apron.
Health Phys
; 72(6): 842-7, 1997 Jun.
Article
en En
| MEDLINE
| ID: mdl-9169926
ABSTRACT
Organ dose equivalents were measured in a humanoid phantom in order to estimate effective dose equivalent (H(E)) and effective dose (E) from low-energy x rays and in the presence or absence of a protective lead apron. Plane-parallel irradiation conditions were approximated using direct x-ray beams of 76 and 104 kVp and resulting dosimetry data was adjusted to model exposures conditions in fluoroscopy settings. Values of H(E) and E estimated under-shielded conditions were compared to the results of several recent studies that used combinations of measured and calculated dosimetry to model exposures to radiologists. While the estimates of H(E) and E without the lead apron were within 0.2 to 20% of expected values, estimates based on personal monitors worn at the (phantom) waist (underneath the apron) underestimated either H(E) or E while monitors placed at the neck (above the apron) significantly overestimated both quantities. Also, the experimentally determined H(E) and E were 1.4 to 3.3 times greater than might be estimated using recently reported "two-monitor" algorithms for the estimation of effective dose quantities. The results suggest that accurate estimation of either H(E) or E from personal monitors under conditions of partial body exposures remains problematic and is likely to require the use of multiple monitors.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Protección Radiológica
/
Fluoroscopía
/
Monitoreo de Radiación
/
Exposición Profesional
Límite:
Humans
Idioma:
En
Revista:
Health Phys
Año:
1997
Tipo del documento:
Article
País de afiliación:
Estados Unidos