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Towards the Optimization of a THCOBRA Detector for X-ray Imaging Purposes

Gaseous detectors are nowadays being used in several high-energy physics experiments and detectors. The choice of the filling gas depends essentially on the main purpose of the detector. Noble gases are typically used due to their physical properties: they are inert, stable, and e.g. W-value or stopping power. Gaseous detectors, particularly Micropatterned Gaseous Detectors (MPGD), find application in fields such as Xray imaging, which requires specific properties (e.g. adequate position resolution), that are affected by the gas medium used for radiation detection. A sealed THCOBRA detector with an enclosed gas purification system and an active area of 2.8 x 2.8 cm2, has been operated in pure Kr. The detector has been studied and the preliminary results of relative charge gain and energy resolution showed effectiveness of the cleaning system in purifying the gas and maintaining the performance.