AI Article Synopsis
- BeO is a luminescent phosphor with very deep traps (VDTs) that cannot be stimulated through traditional methods; this study investigates using thermally assisted optically stimulated luminescence (TA-OSL) to stimulate these traps.
- An intense TA-OSL signal occurs from room temperature to 270 °C, indicating charge transfer from VDTs to dosimetric traps, suggesting that the stimulation process involves the conduction band.
- Although TA-OSL is not as effective for detecting high dose thresholds as minerals like quartz and aluminum oxide, it can help manage VDT occupancy and measure total accumulated doses over time.
Article Abstract
BeO is another luminescent phosphor with very deep traps (VDTs) in its matrix that could not be stimulated using either thermal or conventional optical stimulations. The present study attempts to stimulate these traps using thermally assisted optically stimulated luminescence (TA-OSL), a combination of simultaneous thermal and optical stimulation that is applied to the material following a thermoluminescence measurement up to 500 °C. An intense, peak-shaped TA-OSL signal is measured throughout the entire temperature range between room temperature and 270 °C. This signal can be explained as the transfer of charges from VDTs to both dosimetric TL traps. Experimental features such as the peaked shape of the signal along with the presence of residual TL after the TA-OSL suggest that recombination of TA-OSL takes place via the conduction band. Isothermal TA-OSL is not effective for extending the maximum detection dose thresholds of BeO, unlike minerals such as quartz and aluminum oxide. Nevertheless, TA-OSL could be effectively used in order to either (a) control the occupancy of VDTs, circumventing the intense sensitivity changes induced by long-term uses and high accumulated dose to the VDTs, or (b) measure the total dose accumulated over a series of repetitive dose calculations.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9958777 | PMC |
| http://dx.doi.org/10.3390/ma16041494 | DOI Listing |
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