The position sensitivity of a cylindrical continuous 3″ × 3″ (7.62 cm × 7.62 cm) LaBr3:Ce crystal was studied using a collimated beam of 662 keV gamma rays and a spectroscopic shielded PMT (HAMAMATSU R6233-100SEL) with standard passive voltage divider (HAMAMATSU E1198-26). The used crystal is sealed in a capsule and has diffusive/reflective surfaces to optimize the energy resolution. A complete scan of the crystal was performed with a 5 mm step grid. The data show that, in average, the image, produced by the scintillation light on the photocathode, changes with the source position. By using the measured full energy peak position using three different windows on the PMT it was possible to identify the position of the interaction of the incident gamma ray.
Position sensitivity in a 3″ × 3″ LaBr3:Ce scintillator / A. Giaz, F. Camera, N. Blasi, C. Boiano, S. Brambilla, S. Coelli, B. Million, S. Riboldi, O. Wieland - In: IEEE Nuclear Science Symposium Conference Record[s.l] : Institute of Electrical and Electronics Engineers Inc., 2013. - ISBN 9781479905348. - pp. 1-3 (( convegno 2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013 tenutosi a Seoul, kor nel 2013 [10.1109/NSSMIC.2013.6829642].
Position sensitivity in a 3″ × 3″ LaBr3:Ce scintillator
A. Giaz
;F. Camera
;S. Riboldi
;
2013
Abstract
The position sensitivity of a cylindrical continuous 3″ × 3″ (7.62 cm × 7.62 cm) LaBr3:Ce crystal was studied using a collimated beam of 662 keV gamma rays and a spectroscopic shielded PMT (HAMAMATSU R6233-100SEL) with standard passive voltage divider (HAMAMATSU E1198-26). The used crystal is sealed in a capsule and has diffusive/reflective surfaces to optimize the energy resolution. A complete scan of the crystal was performed with a 5 mm step grid. The data show that, in average, the image, produced by the scintillation light on the photocathode, changes with the source position. By using the measured full energy peak position using three different windows on the PMT it was possible to identify the position of the interaction of the incident gamma ray.
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