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X-Y position readout of a YAP:Ce crystal matrix using wavelength-shifting fibers

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6 Author(s)
Del Guerra, A. ; Dipartimento di Fisica, Pisa Univ., Italy ; Damiani, C. ; Zavattini, G. ; Di Domenico, G.
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A set of preliminary test results of a detector prototype for positron emission tomography applications is presented. The detector is made of a YAP:Ce finger crystal (2×2×30 mm3 each) matrix coupled to a set of square section wavelength-shifting fibers (one fiber for each matrix row and one fiber for each matrix column) read by a position-sensitive detector. The recognition of each fiber allows the determination of the x-y position of the scintillation event. The light yield of the system has been investigated: all possible light loss factors have been taken into account to evaluate the expected signal. Experimental measurements with a single-pixel hybrid photodiodes have been performed. We have measured about ten photoelectrons for a deposit of 511 keV in the scintillator for each coordinate. Preliminary position measurements with a small 5×5 matrix are presented

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Nuclear Science, IEEE Transactions on  (Volume:48 ,  Issue: 4 )