Thermoluminescence of new Al2O3-BeO ceramics after exposure to high radiation doses

Spectrally Resolved Thermoluminescence of Anion‐Deficient Al2O3–BeO Ceramics for High‐Dose Dosimetry

“…[ 35 ] A nonelementary character of the peak at 530 K was also hypothesized. [ 20 ] In particular, it was shown that the peak was caused by continuous activation energy distribution of the traps in the energy range of 1.05–1.5 eV.…”

“…Peak H was considered to be a dosimetric one while analyzing dose dependences of TL of the samples exposed to gamma radiation and a pulse electron beam. [20,21] Comparison of TL peaks intensities in the doped BeO crystals with the concentration of paramagnetic centers and with the curves of the centers annealing showed that thermal decomposition of a hole [Li] 0 center, and electron B 2þ and Al 2þ centers caused TL peaks at 430, 540, and 580 К in BeO. [35] The authors considered the dosimetric peak in BeO as a superposition of these three peaks.…”

“…The method for obtaining samples did not differ from that described previously. [ 20,21 ] Al 2 O 3 –BeO ceramics were synthesized by high‐temperature annealing of the compacts compressed from α‐Al 2 O 3 nanopowder (75–200 nm) in vacuum in BeO crucibles in the presence of carbon in the form of graphite chips. The temperature in the furnace varied in the range of 1200–1400 °C.…”

“…The method for obtaining samples did not differ from that described previously. [20,21] Al 2 O 3 -BeO ceramics were synthesized by hightemperature annealing of the compacts compressed from α-Al 2 O 3 nanopowder (75-200 nm) in vacuum in BeO crucibles in the presence of carbon in the form of graphite chips. The temperature in the furnace varied in the range of 1200-1400 C. Varying synthesis temperature results in changing phase composition and luminescent properties of the obtained ceramics, [21] which is essential to better understand and explain the nature of the trapping and luminescence centers.…”

“…These ceramics were synthesized during high-temperature treatment (1400-1500 C, for 4 h) in vacuum of compacts compressed from α-Al 2 O 3 nanopowder and placed in BeO crucible. [20] Complex ceramics were formed under these conditions due to solid-phase reactions between the compact material (α-Al 2 O 3 ) and the crucible walls (BeO). It was found that the concentration of BeO was about 10% in the ceramic samples synthesized at 1400 C. [21] The presence of carbon during the synthesis resulted in ceramics with higher concentration of beryllium oxide and provided the formation of reducing conditions.…”