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Radiation Protection Dosimetry 2006 118(2):213-218; doi:10.1093/rpd/ncl019
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

New 2-D dosimetric technique for radiotherapy based on planar thermoluminescent detectors

P. Olko1,*, B. Marczewska1, L. Czopyk1, M. A. Czermak1, M. Klosowski1 and M. P. R. Waligórski1,2

1 Institute of Nuclear Physics PAN, ul. Radzikowskiego 152, 31-342 Kraków, Poland
2 Centre of Oncology, ul. Garncarska 11, 31-115 Kraków, Poland

* Corresponding author: Pawel.Olko{at}ifj.edu.pl

At the Institute of Nuclear Physics of the Polish Academy of Sciences (IFJ) in Kraków, a two-dimensional (2-D) thermoluminescence (TL) dosimetry system was developed within the MAESTRO (Methods and Advanced Equipment for Simulation and Treatment in Radio-Oncology) 6 Framework Programme and tested by evaluating 2-D dose distributions around radioactive sources. A thermoluminescent detector (TLD) foil was developed, of thickness 0.3 mm and diameter 60 mm, containing a mixture of highly sensitive LiF:Mg,Cu,P powder and Ethylene TetraFluoroEthylene (ETFE) polymer. Foil detectors were irradiated with 226Ra brachytherapy sources and a 90Sr/90Y source. 2-D dose distributions were evaluated using a prototype planar (diameter 60 mm) reader, equipped with a 12 bit Charge Coupled Devices (CCD) PCO AG camera, with a resolution of 640 x 480 pixels. The new detectors, showing a spatial resolution better than 0.5 mm and a measurable dose range typical for radiotherapy, can find many applications in clinical dosimetry. Another technology applicable to clinical dosimetry, also developed at IFJ, is the Si microstrip detector of size 95 x 95 mm2, which may be used to evaluate the dose distribution with a spatial resolution of 120 µm along one direction, in real-time mode. The microstrip and TLD technology will be further improved, especially to develop detectors of larger area, and to make them applicable to some advanced radiotherapy modalities, such as intensity modulated radiotherapy (IMRT) or proton radiotherapy.


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