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Radiation Protection Dosimetry Advance Access published online on April 13, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci533
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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

DISCRIMINATION OF PHOTON FROM PROTON IRRADIATION USING GLOW CURVE FEATURE EXTRACTION AND VECTOR ANALYSIS

M. Skopec 1 *, M. Loew 2, J. L. Price 3, N. Guardala 3, and M. Moscovitch 4

1 Department of Diagnostic Radiology, National Institutes of Health, Bethesda, MD, USA; George Washington University, Washington DC, USA
2 George Washington University, Washington DC, USA
3 Naval Surface Warfare Center, Carderock Division, West Bethesda, MD, USA
4 Georgetown University, Washington DC, USA

* To whom correspondence should be addressed.
M. Skopec, E-mail: marskopec{at}yahoo.com


  Abstract

Two types of thermoluminescence dosemeters (TLDs), the Harshaw LiF:Mg,Ti (TLD-100) and CaF2:Tm (TLD-300) were investigated for their glow curve response to separate photon and proton irradiations. The TLDs were exposed to gamma irradiation from a 137Cs source and proton irradiation using a positive ion accelerator. The glow curve peak structure for each individual TLD exposure was deconvolved to obtain peak height, width, and position. Simulated mixed-field glow curves were obtained by superposition of the experimentally obtained single field exposures. Feature vectors were composed of two kinds of features: those from deconvolution and those taken in the neighbourhood of several glow curve peaks. The inner product of the feature vectors was used to discriminate among the pure photon, pure proton and simulated mixed-field irradiations. In the pure cases, identification of radiation types is both straightforward and effective. Mixed-field discrimination did not succeed using deconvolution features, but the peak-neighbourhood features proved to discriminate reliably.


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M. Skopec, M. Loew, and M. Moscovitch
Response to Professor Alfassi's Comments
Radiat Prot Dosimetry, September 1, 2009; 136(2): 133 - 134.
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Z. B. Alfassi
Comments on "Discrimination of photons from proton irradiation using glow curve feature extraction and vector analysis" by Skopec et al.
Radiat Prot Dosimetry, September 1, 2009; 136(2): 132 - 133.
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