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Title: Energy non-linearity effects in argon gaseous detectors in the region of the Ar K-absorption edge: experimental results
Authors: Monteiro, C. M. B. 
Simões, P. C. P. S. 
Veloso, J. F. C. A. 
Santos, J. M. F. dos 
Conde, C. A. N. 
Keywords: X-ray detectors; Non-linearity
Issue Date: 2003
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 505:1-2 (2003) 233-237
Abstract: The response of an argon proportional counter to X-rays with energy in the range of 1.5-8 keV was investigated. The response to full-energy absorption events was found to follow different trends for X-ray energies below and above the argon K-absorption edge presenting a discontinuity at this energy. An abrupt decrease of (2.2±0.3)% in the detector amplitude at the K-edge (3.203 keV) was measured, corresponding to a region within±(70±10) eV around the edge where the X-ray energy cannot be obtained unambiguously. This discontinuity corresponds to an abrupt increase of about 0.5 eV in the argon w-value and results in a sudden increase in the energy resolution from about 17% to about 19%. The detector response to escape peak events follows a linear trend over the entire energy range, very close to the response for full-energy absorption of X-rays with energies above the K-edge.
DOI: 10.1016/S0168-9002(03)01059-3
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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