Characteristic of a PDP-based radiation detector in Xe-He mixture gas

Abstract

In this study, we have investigated a 2-dimensional gas detector based on plasma display technology as a candidate for the flat-panel radiation detector. Using the Geant4 and Garfield codes, that simulate the passage of particles through matter, we examined the dependence of X-ray absorption and multiplication factors on the Xe-He gas mixture. Prototype detectors, with four different gas mixtures, were designed and fabricated based on the results from the simulations. The performance of four detectors was evaluated by measuring the collected charge density, dark current density and sensitivity. The maximum collected charge occurred when the Xe 80%-He 20% gas mixture was 1.216 μC/cm2 at -1800 V. The dark current of this detector varied between 0.124 and 0.321 nA/cm2 in the bias range of -300 to -1800 V, which is approximately one-third of the dark current density of an a-Se based detector, in this range. The sensitivity of Xe 80%-He 20% detector was 0.246 nC/mRcm2 at 0.61 V/μm. It is about a tenth lower than that of an a-Se based detector at 10 V/μm.

Development of a DAQ circuit for a plasma-display-panel-based X-ray detector

“…Based on the Monte Carlo simulation studies, the cell structure and gas mixture were optimized to enhance the signal-to-noise ratio (SNR) of the PXD [2]. Finally, a 5inch PXD panel consisting of 1 mm × 1 mm × 2.8 mm cells was developed, and its intrinsic sensitivity and SNR have been reported [3]. Manuscript This prototype detector panel has row and column strips, and hence, it can be used as an imaging detector.…”