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• W3186039520 endingPage "161262" @default.
• W3186039520 startingPage "161262" @default.
• W3186039520 abstract "• Al 2 O 3 :C (commercial) and Al 2 O 3 :Cr,Ni display thermoluminescence (TL) red emission at 650 nm at doses higher than 10 mGy. • Al 2 O 3 :C shows sensitivity to radiation, linear dose response (10-100 mGy), thermal stability and tiny fading (up to 672 h). • Al 2 O 3 :Cr,Ni exhibits similar TL dosimetric features to Al 2 O 3 :C, but fades exponentially (~70%) after 672 hours of storage. • T max -T stop test indicates the coexistence of a continuous and discrete trap system in both Al 2 O 3 :C and Al 2 O 3 :Cr,Ni materials. We herein report on the radiation effect on the red thermoluminescence (TL) emission of synthetic Al 2 O 3 :C (commercial TLD-500 supplied by Harshaw) and Al 2 O 3 :Cr,Ni (grown by the Verneuil method). The materials were previously characterized by cathodoluminescence (CL), displaying significant differences in the UV-IR spectral emission range related to the presence of dopants. Whilst the CL curve of C-doped alumina exhibits four wavebands peaked at 325 (due to F + centers) 411 (F centers), 648 (Fe 3+ ) and 785 nm (Ti 3+ ), the Al 2 O 3 :Cr,Ni sample shows a narrow, sharp, high intensity maximum at 692 nm with two vibronic side bands of lower intensity at 679 nm and 713 nm attributed to the R-lines of Cr 3+ . The red TL emission at 650 nm of both materials indicates that they could potentially be used as dosimeters since (i) are sensitive to ionizing radiation at doses over 10 mGy; (ii) show a linear dose response in the range of 10–100 mGy with regression coefficients of 0.999 and (iii) can be reusable with negligible variation in the intensity (never higher than±0.8%) and no observed changes in the shape of the TL curves. The red glow emission intensity corresponding to the C-doped sample hardly changes with the storage time, however Al 2 O 3 :Cr,Ni fades significantly (ca 70%), up to ~700 h of storage following a behavior that can be fitted to a decreasing exponential function. T max -T stop test suggests the coexistence of continuous and discrete trap systems in both compounds." @default.
• W3186039520 created "2021-08-02" @default.
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• W3186039520 date "2021-12-01" @default.
• W3186039520 modified "2023-10-03" @default.
• W3186039520 title "Characterization of the red thermoluminescence emission of doped alumina: A case study for Al2O3:C and Al2O3:Cr,Ni" @default.
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• W3186039520 doi "https://doi.org/10.1016/j.jallcom.2021.161262" @default.
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