Radiation Protection Dosimetry Advance Access originally published online on December 12, 2006
Radiation Protection Dosimetry 2007 123(4):435-442; doi:10.1093/rpd/ncl500
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Technical performance of the Luxel Al2O3:C optically stimulated luminescence dosemeter element at radiation oncology and nuclear accident dose levels
1 Battelle–Pacific Northwest Division, MSIN K3-55, P.O. Box 999, Richland, WA 99352, USA
2 Battelle–Pacific Northwest Division, MSIN P7-01, P.O. Box 999, Richland, WA 99352, USA
*Corresponding author: steven.miller{at}pnl.gov
Received May 19, 2006, amended October 23, 2006, accepted November 2, 2006
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Abstract |
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The dose ranges typical for radiation oncology and nuclear accident dosimetry are on the order of 2–70 Gy and 0.1–5 Gy, respectively. In terms of solid-state passive dosimetry, thermoluminescent (TL) materials historically have been used extensively for these two applications, with silver-halide, leuco-dye and BaFBr:Eu-based films being used on a more limited basis than TL for radiation oncology. This present work provides results on the performance of a film based on an aluminum oxide, Al2O3:C, for these dosimetry applications, using the optically stimulated luminescence (OSL) readout method. There have been few investigations of Al2O3:C performance at radiation oncology and nuclear accident dose levels, and these have included minimal dosimetric and environmental effects information. Based on investigations already published, the authors of this present study determined that overall improvements over film and TLDs for this Al2O3:C OSL technology at radiation oncology and nuclear accident dose levels may include (1) a more tissue-equivalent response to photons compared to X-ray film, (2) higher sensitivity, (3) ability to reread dosemeters and (4) diagnostic capability using small-area imaging. The results of the present investigation indicate that additional favourable performance characteristics for the Al2O3:C dosemeter are a wide dynamic range (0.001–100 Gy), a response insensitive to temperature and moisture over a wide range, negligible dose rate dependence, and minimal change in post-irradiation response. As a radiation detection medium, this OSL phosphor offers an assortment of dosimetry properties that will permit it to compete with current radiation detection technologies such as silver-halide, leuco-dye and photostimulable-phosphor-based films, as well as TLDs.