PT - JOURNAL ARTICLE AU - Jungwon Kang AU - Hyungsup Shin AU - Sangheum Eom AU - Kisung Lee AU - Hakjae Lee TI - Sensitivity of a 2-dimensional gas type detector based on plasma display technology DP - 2011 May 01 TA - Journal of Nuclear Medicine PG - 1968--1968 VI - 52 IP - supplement 1 4099 - http://jnm.snmjournals.org/content/52/supplement_1/1968.short 4100 - http://jnm.snmjournals.org/content/52/supplement_1/1968.full SO - J Nucl Med2011 May 01; 52 AB - 1968 Objectives Flat-panel radiation detectors based on TFT technology have been developed for X-ray imaging in medical diagnostic. However the detectors using this technology have problems, such as fabrication difficulty, high operation voltage, short lifetime and high production cost. In this study we investigated a 2-dimensional gas type detector based on plasma display panel (PDP) which has been considered as a candidate for flat-panel radiation detector because of low production cost, easy fabrication and large area device. Methods The structure of proposed detector was similar to a conventional PDP. However some of layers, such as phosphor and dielectric layer, were omitted. Three detectors having different cell gaps and gas compositions were fabricated and tested. The experimental set-up consisted of a high voltage waveform generator, an electrometer (Keithley 6517A), a potable X-ray generator and an ionization chamber (TA, TBM-IC). During measurement DC bias from 0 to 1,000 V was applied to the detector. The generated charges and X-ray dose were measured with the electrometer and ionization chamber respectively. Results Based on the measured data the sensitivity of detector was calculated. The sensitivity is equal to ∫ C dt / (exposure area in cm2 * exposure dose in mR) where C is collected charge. As shown in the figure the detector with Xe 100% and 2.8 mm cell gap showed the highest sensitivity. Conclusions Three types of detectors based on PDP structure were designed and fabricated. The sensitivities of three detectors were calculated based on measured data and the detector with Xe 100% and 2.8 mm cell gap showed the highest sensitivity. Due to the limited geometry of detector, increasing X-ray absorption via high Z gas and large cell gap was the most important factor to incraese the sensitivity. Research Support This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0088239)