Vincenti, M. A. (2017) Advanced spectroscopic investigation of color centers in LiF crystals exposed to 6 MV X-ray clinical beams. Il nuovo cimento C, 40 (2). pp. 1-9. ISSN 1826-9885
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Abstract
Polished LiF crystals were irradiated by using 6MV X-rays produced by a clinical linear accelerator. The irradiation doses (absorbed dose to water) covered the 1–100Gy range. Optical absorption spectra show stable formation of primary F defects, while the M absorption band, located at around 450nm and due to the aggregate F2 and F+ 3 color centers, was not detectable. By using the Smakula formula, a concentration of 1.2×1016 and 1.9×1016 F/cm−3 was obtained for LiF crystals irradiated at 50 and 100Gy, respectively. Under argon laser excitation at 457.9nm, photoluminescence spectra of the irradiated LiF crystals exhibited the characteristic F2 and F+ 3 broad emission bands. The integrated photoluminescence intensity of F2 and F+ 3 defects as a function of the irradiation dose shows a linear behaviour in the investigated dose range. This result is confirmed by the measurements of the F2 and F+ 3 integrated photoluminescence intensity performed by using a conventional fluorescence optical microscope under blue lamp illumination. These preliminary experimental results are encouraging for further investigation of nominally pure LiF crystals as clinical dosimeters based on optical reading of photoluminescence emitted by radiation-induced color centers.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 17 Nov 2020 09:37 |
| Last Modified: | 17 Nov 2020 09:37 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/19900 |
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