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Record 20 of 7985
The response of thermally and optically stimulated luminescence from Al2O3:C to high-energy heavy charged particles
External Online Source: doi:10.1016/j.radmeas.2003.12.027
Author and Affiliation:
Gaza, R.(Oklahoma State University, Department of Physics, Arkansas-Oklahoma Center for Space and Planetary Sciences, Stillwater, OK 74078-3072, United States)
Yukihara, E. G.
McKeever, S. W. S.
Abstract: The thermoluminescence (TL) and optically stimulated luminescence (OSL) response of Al2O3 dosimeters to high-energy heavy charged particles (HCP) has been studied using the heavy ion medical accelerator at Chiba, Japan. The samples were Al2O3 single-crystal chips, of the type usually known as TLD-500, and Luxel(TM) dosimeters (Al2O3:C powder in plastic) from Landauer Inc. The samples were exposed to 4He (150 MeV/u), 12C (400 MeV/u), 28Si (490 MeV/us) and 56Fe (500 MeV/u) ions, with linear energy transfer values covering the range from 2.26 to 189 keV/micrometers in water and doses from 1 to 100 mGy (to water). A 90Sr/90Y beta source, calibrated against a 60Co secondary standard, was used for calibration purposes. For OSL, we used both continuous-wave OSL measurements (CW-OSL, using green light stimulation at 525 nm) and pulsed OSL measurements (POSL, using 532 nm stimulation from a Nd:YAG Q-switched laser). The efficiencies (eta HCP, gamma) of the different HCPs at producing OSL or TL were observed to depend not only upon the linear energy transfer (LET) of the HCP, but also upon the sample type (single crystal chip or Luxel(TM)) and the luminescence method used to define the signal--i.e. TL, CW-OSL initial intensity, CW-OSL total area, or POSL. Observed changes in shape of the decay curve lead to potential methods for extracting LET information of unknown radiation fields. A discussion of the results is given, including the potential use of OSL from Al2O3 in the areas of space radiation dosimetry and radiation oncology. c2004 Elsevier Ltd. All rights reserved.
Publication Date: Aug 01, 2004
Document ID:
20050172217
(Acquired Jun 02, 2005)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Radiation measurements; p. 417-20; (ISSN 1350-4487); Volume 38; 4-6
Publisher Information: United Kingdom
Contract/Grant/Task Num: NAG9-1332
Financial Sponsor: NASA Johnson Space Center; Houston, TX United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ALUMINUM OXIDES; CHARGED PARTICLES; HEAVY IONS; LINEAR ENERGY TRANSFER (LET); LUMINESCENCE; RADIATION MEASUREMENT; CALIBRATING; CARBON; HELIUM; IRON; PARTICLE ACCELERATORS; RADIATION DOSAGE; SILICON
Other Descriptors: ALUMINUM OXIDE; HEAVY IONS; LINEAR ENERGY TRANSFER; THERMOLUMINESCENT DOSIMETRY/INSTRUMENTATION/METHODS; CALIBRATION; CARBON; COMPARATIVE STUDY; HELIUM; IRON; PARTICLE ACCELERATORS; RADIATION DOSAGE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S; SILICON
Availability Source: Other Sources
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