Evaluation of Hamamatsu R5900 series PMTs for readout of high-resolution scintillator arrays

Yiping Shao, Robert W. Silverman, Simon R Cherry

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Two types of Hamamatsu R5900 series photomultiplier tubes (PMTs) have been evaluated as position-sensitive photon detectors for reading out arrays of small scintillator elements. Both PMTs have metal-channel dynode structures and compact dimensions of 26×26×20 mm3. Model R5900-C12 is a position sensitive PMT (PS-PMT) with photoelectrons shared among 12 plate anodes arranged in a crossed pattern such that there are six anodes each in the X and Y directions. Model R5900-M64 is a multi-channel PMT (MC-PMT) with 64 individual channels and low inter-channel crosstalk. Scintillator arrays can be coupled to these PMTs either directly or by using optical fibers. In this paper, we present measurements of single photoelectron spectra, pulse linearity, positioning response, inter-channel gain variation and pixel-to-pixel crosstalk for these PMTs. We have also measured their positioning response in reading out high-resolution lutetium oxyorthosilicate (LSO) scintillator arrays. Across a sample of 30 R5900-M64 MC-PMTs which were manufactured recently, the maximum gain variation over all channels is less than 3:1, while the difference between any two adjacent channels is less than 2:1. With a tapered voltage divider, the output of the anode signal at a gain of 106 remains linear up to 200 photoelectrons for the R5900-M64. For the R5900-C12, the summed anode signal remains linear up to 400 photoelectrons when irradiated through a 2 mm diameter aperture. Images obtained with a Na-22 source irradiating an array of 1×1×10 mm3 LSO crystals coupled by an optical fiber bundle to the R5900-C12 or the R5900-M64 show excellent crystal identification.

Original languageEnglish (US)
Pages (from-to)379-388
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume454
Issue number2-3
DOIs
StatePublished - Nov 11 2000

Fingerprint

Photomultipliers
photomultiplier tubes
Phosphors
scintillation counters
readout
Photoelectrons
evaluation
high resolution
Anodes
photoelectrons
anodes
Crosstalk
crosstalk
positioning
Optical fibers
optical fibers
Pixels
pixels
dynodes
Lutetium

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

Cite this

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title = "Evaluation of Hamamatsu R5900 series PMTs for readout of high-resolution scintillator arrays",
abstract = "Two types of Hamamatsu R5900 series photomultiplier tubes (PMTs) have been evaluated as position-sensitive photon detectors for reading out arrays of small scintillator elements. Both PMTs have metal-channel dynode structures and compact dimensions of 26×26×20 mm3. Model R5900-C12 is a position sensitive PMT (PS-PMT) with photoelectrons shared among 12 plate anodes arranged in a crossed pattern such that there are six anodes each in the X and Y directions. Model R5900-M64 is a multi-channel PMT (MC-PMT) with 64 individual channels and low inter-channel crosstalk. Scintillator arrays can be coupled to these PMTs either directly or by using optical fibers. In this paper, we present measurements of single photoelectron spectra, pulse linearity, positioning response, inter-channel gain variation and pixel-to-pixel crosstalk for these PMTs. We have also measured their positioning response in reading out high-resolution lutetium oxyorthosilicate (LSO) scintillator arrays. Across a sample of 30 R5900-M64 MC-PMTs which were manufactured recently, the maximum gain variation over all channels is less than 3:1, while the difference between any two adjacent channels is less than 2:1. With a tapered voltage divider, the output of the anode signal at a gain of 106 remains linear up to 200 photoelectrons for the R5900-M64. For the R5900-C12, the summed anode signal remains linear up to 400 photoelectrons when irradiated through a 2 mm diameter aperture. Images obtained with a Na-22 source irradiating an array of 1×1×10 mm3 LSO crystals coupled by an optical fiber bundle to the R5900-C12 or the R5900-M64 show excellent crystal identification.",
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N2 - Two types of Hamamatsu R5900 series photomultiplier tubes (PMTs) have been evaluated as position-sensitive photon detectors for reading out arrays of small scintillator elements. Both PMTs have metal-channel dynode structures and compact dimensions of 26×26×20 mm3. Model R5900-C12 is a position sensitive PMT (PS-PMT) with photoelectrons shared among 12 plate anodes arranged in a crossed pattern such that there are six anodes each in the X and Y directions. Model R5900-M64 is a multi-channel PMT (MC-PMT) with 64 individual channels and low inter-channel crosstalk. Scintillator arrays can be coupled to these PMTs either directly or by using optical fibers. In this paper, we present measurements of single photoelectron spectra, pulse linearity, positioning response, inter-channel gain variation and pixel-to-pixel crosstalk for these PMTs. We have also measured their positioning response in reading out high-resolution lutetium oxyorthosilicate (LSO) scintillator arrays. Across a sample of 30 R5900-M64 MC-PMTs which were manufactured recently, the maximum gain variation over all channels is less than 3:1, while the difference between any two adjacent channels is less than 2:1. With a tapered voltage divider, the output of the anode signal at a gain of 106 remains linear up to 200 photoelectrons for the R5900-M64. For the R5900-C12, the summed anode signal remains linear up to 400 photoelectrons when irradiated through a 2 mm diameter aperture. Images obtained with a Na-22 source irradiating an array of 1×1×10 mm3 LSO crystals coupled by an optical fiber bundle to the R5900-C12 or the R5900-M64 show excellent crystal identification.

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