Vincenti, M. A. and Montereali, R. M. and Nichelatti, E. and Nigro, V. (2024) Photoluminescent colour centres in lithium fluoride film imaging detectors for monochromatic hard X-rays. Il nuovo cimento C, 47 (5). pp. 1-4. ISSN 1826-9885
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Abstract
Passive solid-state detectors based on the optical reading of the visible photoluminescence (PL) emitted by radiation-induced F2 and F+ 3 colour centres in lithium fluoride (LiF) have been successfully tested for X-ray imaging. They are characterized by high spatial resolution, wide dynamic range, large field of view, non-destructive readout capability, and simplicity of use. Optically-transparent polycrystalline LiF films of increasing thickness (0.5 and 1.1μm) grown by thermal evaporation on glass and Si(100) substrates were irradiated with monochromatic 7keV X-rays at several doses from 13 to 1.4 × 103Gy at the SOLEIL synchrotron facility. For all the LiF films, the spectrally-integrated visible PL signal intensity was found to depend linearly on the irradiation dose, with films grown on Si(100) substrates exhibiting up to a 50% higher response compared to those grown on glass. The minimum dose of 13 Gy was detected, despite the low thickness of the irradiated films. A spatial resolution of (0.54 ± 0.02) μm was obtained in edge-enhancement imaging experiments conducted by placing an Au mesh in front of the LiF film detectors.
| Item Type: | Article |
|---|---|
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 23 Jan 2025 14:26 |
| Last Modified: | 23 Jan 2025 14:26 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23341 |
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