Photodetector and scintillation crystals requirements for gamma-ray imaging

Pani, R. and Cinti, M. N. and Pellegrini, R. and Bennati, P. and Lo Meo, S. and Ridolfi, S. and Vittorini, F. and de Notaristefani, F. and Mattioli, M. (2007) Photodetector and scintillation crystals requirements for gamma-ray imaging. Il nuovo cimento C, 30 (5). pp. 435-448. ISSN 1826-9885

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The diffusion of the PET and SPET techniques in different applications, like investigation on small organs and tissues or animal imaging, has induced in the past years the researchers to develop modular scintillation cameras to have compactness and versatility in order to obtain dimensions and configurations suitable to the particular application. To this purpose different photodetectors have been studied, as an alternative to the photomultiplier tubes (PMT) based on semiconductor technology. At the same time new scintillating crystals have been tested to match the requirements like high light yield or fast decay time, needed for SPET and PET application, respectively. In this paper we have investigated the photodetector and scintillation crystals requirements to optimize a gamma-ray imager based on scintillation crystals. To this aim we show results about the principal parameters characterizing a gamma-ray imaging, like energy and spatial resolution. The performances of a continuous LaBr3:Ce crystal (49×49×4mm3+3mm glass window) are compared to the ones from a pixellated and continuous NaI:Tl crystal, coupled to multi-anode photomultiplier tube (Hamamatsu H8500 MA-PMT). Furthermore the results are supported with Monte Carlo simulations. With the lanthanum detector, we obtain 1.1mm of intrinsic spatial resolution, comparable with that predicted by the MC simulations. We test also the new ultra bialkali PMT Hamamatsu R7600-200 with a QE = 42%, obtaining an improvement in terms of energy resolution of about 25%, respect to a standard PMT, with a LaBr3:Ce cylinder (1/2" ��φ × 1/2" thickness).

Item Type: Article
Additional Information: Paper presented at the 1st Workshop on Photon Detection for High Energy Medical and Space Applications; Perugia, June 13-14, 2007.
Uncontrolled Keywords: Monte Carlo models ; Instrumentation ; Non-ionizing radiation equipment and techniques
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 20 Mar 2020 17:40
Last Modified: 20 Mar 2020 17:40

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