The application of the curved-grid technique to a gas proportional scintillation counter with a small-diameter photo-multiplier tube

Journal Article · Mon Jun 01 04:00:00 EDT 1998 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/23.682385· OSTI ID:624127

Santos, J M.F. dos; Soares, A J.V.D.; Monteiro, C M.B.; Conde, C A.N. ^[1]; Morgado, R E ^[2]

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1. Univ. of Coimbra (Portugal). Physics Dept.
2. Los Alamos National Lab., NM (United States)

The curved-grid technique was developed to maintain the superior performance of large-area gas proportional scintillation counters (GPSCs) without resorting to complex and bulky focusing systems or large photomultiplier tubes (PMTs) for applications in energy-dispersive X-ray fluorescence analysis. The technique is a simple method to compensate for the variation in solid angle viewed by the PMT as a function of the radial distance from the cylindrical axis of the detector. The feasibility of the technique is demonstrated in a GPSC, by measuring the energy resolution as a function of entrance window diameter. With a properly shaped curved grid, no degradation in detector energy resolution is observed even when the effective detector sensitive area is increased approximately six-fold. The maximum ratio of detector entrance window to PMT diameter achieved thus far is approximately 0.75.

• OSTI ID: 624127
• Report Number(s): CONF-971147--
• Journal Information: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 3Pt1 Vol. 45; ISSN 0018-9499; ISSN IETNAE
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
DESIGN
GAS SCINTILLATION DETECTORS
PERFORMANCE
PHOTOMULTIPLIERS
PROPORTIONAL COUNTERS
X-RAY FLUORESCENCE ANALYSIS
X-RAY FLUORESCENCE ANALYZERS