Affiliations: Department of Electronics and Electrical Engineering,
Dankook University, Gyeonggi-do, Korea | Department of Radiologic Science, Korea University,
Seoul, Korea
Note: [] Corresponding author: Jungwon Kang, Department of Electronics
and Electrical Engineering, Dankook University, 126 Jukjeon-dong, Suji-gu,
Yongin-si, Gyeonggi-do 448-701, Korea. Fax: +82 31 8005 3627; E-mail: jkang@dku.edu
Abstract: In this study we have investigated a 2-dimensional gas type detector
based on plasma display technology as a candidate for the flat-panel radiation
detector. By using the Garfield code, the dependence of X-ray absorption and
multiplication on gas composition, cell gap and electric field were examined.
Considering the simulation results, three prototype detectors were designed and
fabricated. The performance of these detectors was evaluated by measuring the
collected charge density, dark current density and sensitivity. The collected
charge had the highest value at a condition when Xe 100% and 2.8 mm gap was
108.8 nC/cm^{2} at 1000 V. The dark current of the same detector was varied
from 0.0095 to 0.10 nA/cm^{2} and about a fourth of the dark current density
of a-Se based detector was at the bias range of 100–1000 V. The sensitivity
of Xe 100% and 2.8 mm detector was 0.20 nC/mR·cm^{2} at 0.36 V/um.
It is about a tenth lower than that of a-Se based detector at 10 V/um.
