Presentation Information
[9a-N103-5]Energy Dependence of a Heteroepitaxial Diamond Solid-state Ionization Chamber under Diagnostic X-ray Irradiation
〇Kiyomitsu Shinsho1, Koji Koyama2, Seong woo Kim2, Keitaro Hitomi3, Osamu Maida4, Toshiyuki Onodera5, Shimma Hashimoto1, Kanata Kikkawa1, Ako Haga1, Daiki Maruyama1, Yusuke Koba6, Mitsuhiro Nogami3 (1.Tokyo Metropolitan Univ., 2.Orbray Co.,Ltd., 3.Tohoku Univ., 4.Osaka Univ., 5.Tohoku Institute of Technology, 6.QST-NIRS)
Keywords:
diamond,solid state ionization chamber,energy dependence
The X-ray response characteristics of a solid-state ionization chamber using heteroepitaxial diamond were evaluated. Under X-ray conditions with effective energies of 34–54 keV and applied voltages ranging from 1 to 500 V, the collected charge increased with increasing voltage, showing a sensitivity 2 to 3 orders of magnitude higher than that of an air ionization chamber. The energy dependence of the sensitivity was within approximately ±20%. In addition, the charge collection time tended to increase at higher voltages, suggesting that charge carriers trapped by lattice defects were gradually released and contributed to the delayed signal.