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Radiation Protection Dosimetry Advance Access published online on April 27, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci654
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

SSD 2004 Special Issue Articles

EXPERIMENTAL DETERMINATION OF THE DOSE DEPOSITION PROFILE OF A 90Sr BETA SOURCE

R. Gaza 1 *, E. Bulur 1, S. W. S. McKeever 1, and C. G. Soares 2

1 Department of Physics, Oklahoma State University, 145 PS II, Stillwater, OK 74078, USA
2 National Institute of Standards and Technologies, Gaithersburg, MD 20899, USA

* To whom correspondence should be addressed.
R. Gaza, E-mail: rgaza{at}mdanderson.org


  Abstract

Three different methods for characterising the dose deposition profile of a 90Sr/90Y radioactive source are described: GAFChromic film dosimetry, Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL). For the film measurements, GAFChromic film samples were stacked at different depths between polyethylene terephthalate (PET) foils. For TL, the thickness of a TLD-500 dosemeter was gradually reduced by polishing and the TL from chips of different thickness was used in conjunction with a mathematical model based on the exponential attenuation of dose inside the crystal to determine the decay constant for the dose-depth profile. Finally, an OSL reader with confocal stimulation/detection capabilities was used to map the two-dimensional dose distribution in TLD-500 dosemeters as a function of depth. The shapes of the dose deposition profiles obtained from all the investigated methods are in good agreement.


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