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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Gino Fallone, B. Lachaine, M. |
| Copyright Year | 2000 |
| Description | Author affiliation: Cross Cancer Inst., Alberta Univ., Edmonton, Alta., Canada (Gino Fallone, B.) |
| Abstract | Research into medical X-ray detectors based on amorphous selenium (a-Se) has seen a resurgence lately due to the advent of flat-panel active matrix technology. There is presently no quantitative theory, however, to explain the signal formation due to the interaction of ionizing radiation with a-Se. One of the main obstacles in the characterization of this process is the lack of suitable interaction cross-sections. In this work the authors develop an expression for the calculation of inelastic electron cross-sections from a dipole oscillator strength distribution, which includes relativistic and exchange effects. They construct the oscillator strength distribution from known experimental results and calculate the total and cumulative differential cross-sections for incident electron energies ranging from a few eV to 23 MeV. The total cross-section agrees with that of isolated Se atoms at high energies, and provides the low energy cross-sections which depend on the dielectric properties of the amorphous state. From these cross-sections, Monte Carlo codes can be developed which simulate the creation of individual electron-hole pairs, which will lead to a better understanding of the signal-formation process in a-Se based X-ray detectors. |
| Starting Page | 2063 |
| Ending Page | 2066 |
| File Size | 345584 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780364651 |
| ISSN | 1094687X |
| DOI | 10.1109/IEMBS.2000.900531 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2000-07-23 |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | X-ray imaging Portals X-ray detectors Amorphous materials Electrons Oscillators Biomedical imaging Medical diagnostic imaging Active matrix technology Ionizing radiation |
| Content Type | Text |
| Resource Type | Article |
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