Neutron fluence and kerma spectra of a p(66)/Be(40) clinical source.
Med Phys
; 19(5): 1285-91, 1992.
Article
en En
| MEDLINE
| ID: mdl-1435611
ABSTRACT
High-resolution neutron fluence spectra have been measured in the National Accelerator Centre's p(66)/Be(40) neutron therapy beam by the pulsed-beam time-of-flight method. ICRU muscle kerma spectra have been derived from the fluence spectra. Spectral changes resulting from different irradiation conditions have been quantified in terms of the average neutron energy and the fractional low-energy (< 16 MeV) contribution. The changes observed with different thicknesses of polyethylene filtration are consistent with changes in quality parameters determined in biological and microdosimetric experiments. The dosimetry parameters (KtissueA150) N and (Wgas) N calculated for the measured spectra agree with the values recommended in the neutron dosimetry protocol. The shapes of the present fluence spectra differ from previous measurements of p(> 40)/Be spectra. In particular, they differ significantly from the spectrum measured by recoil techniques in an identical neutron therapy unit at the Clatterbridge Hospital, UK. The reasons for the difference are not known.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Berilio
/
Terapia por Captura de Neutrón
Tipo de estudio:
Guideline
Límite:
Humans
Idioma:
En
Revista:
Med Phys
Año:
1992
Tipo del documento:
Article
País de afiliación:
Sudáfrica