(Sunday, 7/12/2020) [Eastern Time (GMT-4)]
Room: AAPM ePoster Library
Purpose:
To develop a new Optically Stimulated Luminescence (OSL) dosimeter based on tissue-equivalent BeO:Na,Dy,Er ceramic (Zeff =7.31) using the precipitation method, having high sensitivity to ionizing radiation and fast luminescence lifetime for dosimetry applications.
Methods:
The material structure was confirmed by performing X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive X-ray (EDS) analyses. Thermoluminescence (TL), OSL, and X-ray luminescence (XL) techniques were used for the investigation of the luminescence properties.
Results:
BeO:Na,Dy,Er has two TL peaks located at ~170 and 350 °C (at a heating rate of 2 °C/s) found to be associated with the OSL signals using the step annealing procedure. The OSL signals of newly developed BeO:Na,Dy,Er pellets were found highly sensitive to radiation and almost linear with a linearity coefficient of 1.03, i.e., described by a relation y= a+ bx^1.03 at a range between 0.1 and 50 Gy. We determined that the sensitivity of OSL from BeO:Na,Dy,Er pellets is the same after repeated exposure and reprocessing. Except for instability in short storage times, negligible long-term OSL signal fading was observed for up to three months at ambient temperature, in dark. In XL analyses, broadband emission from 200 nm to 500 nm was observed at different dopant concentrations.
Conclusion:
With the triple doping of BeO, it was observed that most of the properties desired in a new OSL dosimeter for radiation dosimetry applications are met by the newly developed material. It can be concluded that the OSL characteristics of BeO:Na,Dy,Er ceramic pellets with high sensitivity, dose linearity, low-fading, reusability, and thermal stability are very encouraging and convenient for personal and medical dosimetry applications.
Funding Support, Disclosures, and Conflict of Interest: Research supported by NATO Science for Peace multi-year grant.
Keywords
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Taxonomy
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