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Radiation Protection Dosimetry Advance Access originally published online on April 27, 2006
Radiation Protection Dosimetry 2006 119(1-4):71-74; doi:10.1093/rpd/nci642
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Superlinear dose dependence of high temperature thermoluminescence peaks in Al2O3:C

D. Lo1, J. L. Lawless2 and R. Chen3,*

1 Physics Department, The Chinese University of Hong Kong, Hong Kong, China
2 Redwood Scientific Inc., Pacifica, CA, USA
3 School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Israel

* Corresponding author: chenr{at}tau.ac.il

We report on strong superlinearity of high temperature (300–700°C) thermoluminescence (TL) peaks in {alpha}-Al2O3:C powder. The main dosimetric peak at ~200°C, previously found to exhibit slight superlinearity, is now shown to yield a slope of ~1.15 on a log(intensity) vs. log(dose) curve. Higher temperature peaks at ~320, 450 and 650°C, previously reported following UV and X-ray excitation, have now been observed after beta irradiation and showed stronger superlinearity. Using a blue filter, the weak peak at ~320°C started about quadratically and the slope on the log–log scale decreased gradually from 2 to about unity at ~100 Gy. The two higher temperature peaks at ~450 and ~650°C also exhibited a strong superlinear dose dependence in this dose range, with an average slope of ~2. Roughly similar behaviour has been found when a UV filter was used. The possible explanation of the strong superlinearity is discussed.


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