The effect of grid misalignment on the uniformity of response of gas proportional scintillation counters

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:513086

Santos, J M.F. dos; Morgado, R E ^[1]

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1. Los Alamos National Lab., NM (United States)

In the present work we revisit the simplifying assumptions of an earlier theoretical work on the effect of grid misalignment on the performance of planar GPSCs. Experimental results that quantitatively establish this effect are presented. The magnitude of the effect is not as large as predicted due in part to the reduced dependence of the electroluminescence yield on the reduced electric field near threshold and due to electron cloud size. For the reduced fields normally used in the scintillation region of an optimized GPSC, misalignments as large as 3% have less than a 1% effect on pulse-amplitude variations. This effect is less than. the statistical fluctuations in the number of primary electrons nominally produced in the absorption of x-rays. For reduced fields closer to the scintillation threshold, 15% variations in pulse amplitudes are possible, although it is unlikely that a GPSC would be operated under those conditions.

• OSTI ID: 513086
• Report Number(s): CONF-961123--; CNN: Project STRDA/C/CEN/422/92
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
ALIGNMENT
ELECTROLUMINESCENCE
GAS SCINTILLATION DETECTORS
PROPORTIONAL COUNTERS
X-RAY SPECTROMETERS