A calcination study on BeO ceramics for radiation dosimetry

A systematic study on luminescence characterization of lanthanide-doped BeO ceramic dosimeters

“…On the other hand, studies on the TL glow curve of BeO Thermalox 995 chip showed three main TL peaks at 75, 200, and 340 °C (depending on the heating rates during TL readouts) [23], although some deep traps were also found after 340 °C [51]. In this work, the observed five peaks are suggested to be consistent with the TL glow curve shapes obtained in the undoped and doped BeO ceramic materials specified in our previous studies [12,13,31].…”

“…All raw dopant materials (Na + , Li + , K + , and Ln 3+ (Eu 3+ , Ce 3+ , Nd 3+ , Yb 3+ , Er 3+ , Gd 3+ , Tb 3+ , Tm 3+ , Sm 3+ , Sr 3+ , Pr 3+ , and Dy 3+ )) used were only nitrate based. The coprecipitation method was presented in detail previously in our studies [12,20,31,38], and modified to better control the Ln 3+ -doped BeO synthesis process in this study. The actual Ln 3+ contents in the sintered pellets were not verified.…”

“…As can be seen from Table 2, the diffraction peak positions (2θ) slightly shifted to the right with Ln 3+ doping. It can be said that three highly sensitive peaks regarding (100), (002), and (101) orientations shift to the right due to a decrease in lattice parameters a and c when compared to the undoped sample, leading to a resultant increase in the concentration of defects in the structure [31,41]. In our investigations, as the target material was exposed to severe deformation with Ln 3+ doping, the resulting deformation and inhomogeneous strain in the crystal lattice led to increase in full-width at the half maximum (FWHM = β) of the diffraction peak (see Table 2).…”

“…3). The source of the large and sensitive emission at approximately 4.9 eV is the radiative annihilation of self-trapped excitons caused by X-ray excitation [31,32,46,47]. The luminescence in BeO is known to be characterized by the two emission bands at ~3-4 eV (300-400 nm) and 4.9 eV [47].…”

“…Therefore, it attracts researchers to produce new BeO-based materials with appropriate dopants to improve the luminescence properties of BeO ceramic material and achieve controllable luminescence. Due to the increasing demand for passive radiation detectors in radiation dosimetry, our research group has been studying synthesized and doped BeO ceramics as probable OSL dosimeters over the last decade [11][12][13]20,31,32].…”