his paper explores the possibilities offered by basic photon scattering phenomenology in the study of anew collimator devised to enhance the collection of photons undergoing a single scattering in a volumeof interest. In order to maximize the spatial resolution, a 90scattering geometry was considered. Thecollimator was composed of two parallel plates perpendicular to both the detector surface and the plane offirst scattering defined by the trajectories of the incident and scattered photons. In this way, photons whoseazimuthal angle ranges over a wide interval but with the same scattering angle could reach the detector.Experimental comparison between this collimation and the usual narrow one was performed at a photonenergy of 59.54 keV under the same sample and irradiation geometry. The first results showed that anenhancement of about 10-fold could be reached with regard to the main Compton and coherent peaks.On the other hand, the multiple scattering fraction only rose to a maximum of 20% in the worst case, ascompared with that observed in classical highly collimated geometry. The usual analytical capacity offeredby the scattering techniques was demonstrated to be still valid in this situation.
EDXRS Study of a New Collimatorfor Enhanced Scattering Techniques
TARTARI, Agostino
;BONIFAZZI, Claudio;
1999
Abstract
his paper explores the possibilities offered by basic photon scattering phenomenology in the study of anew collimator devised to enhance the collection of photons undergoing a single scattering in a volumeof interest. In order to maximize the spatial resolution, a 90scattering geometry was considered. Thecollimator was composed of two parallel plates perpendicular to both the detector surface and the plane offirst scattering defined by the trajectories of the incident and scattered photons. In this way, photons whoseazimuthal angle ranges over a wide interval but with the same scattering angle could reach the detector.Experimental comparison between this collimation and the usual narrow one was performed at a photonenergy of 59.54 keV under the same sample and irradiation geometry. The first results showed that anenhancement of about 10-fold could be reached with regard to the main Compton and coherent peaks.On the other hand, the multiple scattering fraction only rose to a maximum of 20% in the worst case, ascompared with that observed in classical highly collimated geometry. The usual analytical capacity offeredby the scattering techniques was demonstrated to be still valid in this situation.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
