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Assessment of light distribution at the photocathode of 5″ and 1″ position sensitive photomultiplier tubes

Soares, AJ; Cullum, I; Christie, F; Royle, GJ; Speller, RD; Miller, DJ; (1998) Assessment of light distribution at the photocathode of 5″ and 1″ position sensitive photomultiplier tubes. Proceedings of SPIE - The International Society for Optical Engineering , 3336 pp. 818-829. 10.1117/12.317090.

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Abstract

We present the evaluation of two Position Sensitive Photomultiplier Tubes (PSPMT), the 1″ square Hamamatsu R5900-C8 and the 5″ circular Hamamatsu R3292, and discuss their suitability as light sensors in a high resolution small gamma camera for in-vivo radioisotope imaging studies. It has been found that there is a strong dependence between the performance of both tubes and the size of the light distribution at the photocathode. For very narrow distributions (1 mm FWHM) from an optical fibre incident on the R5900-C8, most of the area of the tube is insensitive to position changes. This is related to the size of the anodes and the small spread of electron charge in the dynode multiplication process. For wider distributions (2.2 mm FWHM), we achieved a spatial resolution of 1 mm FWHM. The R5900-C8 has also been coupled to a 5 mm thick CsI(Na) crystal which was scanned across by a 1 mm collimated Tc-99m source (140 keV). The results confirm the importance of light spread at the photocathode. The Hamamatsu R5900-C8 was found to be a promising detector for high resolution radionuclide imaging. The results obtained with the R3292 indicate that a high spatial resolution (< 2 mm FWHM) is achieved for narrow light distributions (≤ 1 mm FWHM).

Type: Article
Title: Assessment of light distribution at the photocathode of 5″ and 1″ position sensitive photomultiplier tubes
DOI: 10.1117/12.317090
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/34605
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