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- Title
THERMOLUMINESCENCE OF NEWLY DEVELOPED HIGHLY SENSITIVE α-Al<sub>2</sub>O<sub>3</sub>:C BY THE VERTICAL GRADIENT FREEZING METHOD.
- Authors
Sun, T; Tang, K; Cui, H; Fan, H
- Abstract
A highly sensitive α-Al2O3:C crystal was directly grown by the vertical gradient freezing (VGF) method using Al2O3 and graphite powder as the raw materials. The main thermoluminescence (TL) characteristics of α-Al2O3:C detectors grown by the VGF method and TLD-500K detectors were compared. The α-Al2O3:C grown by the VGF method shows good dosimetric properties, such as high TL sensitivity (152 times higher than that of the TLD-100 at heating rate of 1°C/s), an extremely low residual signal of 0.03%, a minimum measurable dose of 0.12 μGy and an excellent linear response within the dose range studied from 1 μGy to 10 Gy. The α-Al2O3:C detectors grown by the VGF method have a higher sensitivity and a better linear response compared to the TLD-500K detectors. Both kinds of α-Al2O3:C can be used in an unannealed form and to measure the very low dose in environmental monitoring and personnel dosimetry.
- Subjects
THERMOLUMINESCENCE; ENVIRONMENTAL monitoring; RAW materials; DETECTORS; GRAPHITE; RADIATION dosimetry; PYROLYTIC graphite
- Publication
Radiation Protection Dosimetry, 2019, Vol 184, Issue 2, p174
- ISSN
0144-8420
- Publication type
Article
- DOI
10.1093/rpd/ncy196