Evaluation of multi-channel PMT's for readout of scintillator arrays

Yiping Shao, Simon R. Cherry, Stefan Siegel, Robert W. Silverman, Stan Majewski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


We have evaluated two Philips multi-channel photo-multiplier tubes (MC-PMT's) for use as position sensitive photon detectors for reading out scintillator arrays. We are interested in the use of such a detector for medical imaging applications with relatively low light output scintillators such as bismuth germanate (BGO). The 64 pixel XP1702 model MC-PMT has a standard glass entrance window whereas the XP1722 has a fiber-optic entrance window designed to reduce crosstalk. Scintillator arrays are typically coupled to the PMT's using fiber-optics. In this evaluation, parameters such as inter-channel gain variation, crosstalk, photoelectron spectrum and linearity were measured. For both the XP1702 and XP1722, the maximum gain variation over all 64 channels is less than 3:1, while the difference between any two adjacent channels is less than 2:1. Crosstalk to the nearest neighbor is around 10% for the fiber optic input window tube compared with 20% for the glass input window tube and is relatively insensitive to the size and numerical aperture of the optical fiber used. Dynode linearity range is maintained up to a signal level of 400 photoelectrons. Images obtained with a 511 KeV source irradiating an 8 × 8 array of 2 × 2 × 10 mm BGO crystals coupled by optical fiber to these tubes show excellent crystal identification, particularly using the lower crosstalk XP1722 MC-PMT.

Original languageEnglish (US)
Title of host publicationIEEE Nuclear Science Symposium & Medical Imaging Conference
Number of pages5
StatePublished - Dec 1 1995
EventProceedings of the 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 3) - San Francisco, CA, USA
Duration: Oct 21 1995Oct 28 1995


OtherProceedings of the 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 3)
CitySan Francisco, CA, USA

ASJC Scopus subject areas

  • Engineering(all)


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