A simple method to improve the spatial uniformity of venetian-blind photomultiplier tubes

Author

dos Santos, J.M.F. ; Veloso, J.F.C.A. ; Lopes, J.A.M. ; Morgado, R.E.

Author_Institution

Dept. de Fisica, Coimbra Univ., Portugal

Volume

43

Issue

3

fYear

1996

fDate

6/1/1996 12:00:00 AM

Firstpage

1335

Lastpage

1340

Abstract

An improvement in the uniformity of venetian-blind photomultiplier tubes has been achieved by reducing the voltage difference between the first and second dynodes. The method has been applied to a gas proportional scintillation counter (GPSC) instrumented with a venetian-blind photomultiplier (PMT). When exposed to a 20-mm collimated 5.9-keV X-ray beam, an overall improvement in energy resolution for the GPSC/PMT combination from 20% to 11.5% was achieved. An alternative method that reduces the photocathode-to-first-dynode voltage was less effective and resulted in a severe degradation of detector energy resolution.

Keywords

X-ray detection; gas scintillation detectors; photomultipliers; 5.9 keV; collimated X-ray beam; dynodes; energy resolution; gas proportional scintillation counter; photocathode-to-first-dynode voltage; spatial uniformity; venetian-blind photomultiplier tubes; Cathodes; Degradation; Electromagnetic interference; Energy resolution; Instruments; Photomultipliers; Scintillation counters; Solid scintillation detectors; Testing; Voltage;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.507061

Filename

507061