26 May 1994 Imaging parameters of a kinestatic charge detector containing Kr, NH3, and CO2 at 80 atm
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Abstract
In this paper, modulation transfer function and image noise measurements are presented for Kinestatic Charge Detectors employing high-pressure Kr gas doped with NH3 and CO2. Kr improves spatial resolution over Xe because, at equal x-ray mean free path, it has both reduced fluorescence reabsorption and reduced electron range. NH3 eliminates mobility dispersion (disparate ionic mobilities from multiple charge carriers) caused by gas impurities. CO2 reduces electron attachment and thus ion-ion recombination because it lowers the electron temperature, thereby increasing electron drift velocity via the Ramsauer effect.
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Frank A. DiBianca, Sreenivas Devidas, George C. Giakos, Shashidhar Kollipara, Senthilkumar Nagarajan, Qian Peng, "Imaging parameters of a kinestatic charge detector containing Kr, NH3, and CO2 at 80 atm", Proc. SPIE 2132, Clinical Applications of Modern Imaging Technology II, (26 May 1994); doi: 10.1117/12.176569; https://doi.org/10.1117/12.176569
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