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Radiation Protection Dosimetry Advance Access published online on April 27, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci638
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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

ON THE DOSE RESPONSE OF SOME CVD DIAMOND THERMOLUMINESCENT DETECTORS

B. Marczewska 1 *, P. Bilski 1, P. Olko 1, M. Nesladek 2, M. Rebisz 3, and M. J. Guerrero 4

1 Institute of Nuclear Physics (INP), ul. Radzikowskiego 152, PL 31-342 Kraków, Poland
2 Institute for Materials Research at the Limburg University, Belgium
3 CEA Saclay, France; Institute of Nuclear Physics (INP), ul. Radzikowskiego 152, PL 31-342 Kraków, Poland
4 CEA Saclay, France

* To whom correspondence should be addressed.
B. Marczewska, E-mail: Barbara.Marczewska{at}ifj.edu.pl


  Abstract

The linearity of dose response of chemical vapour deposition (CVD) diamonds grown at the Institute for Materials Research at Limburg University, Belgium, was investigated over a dose range relevant for radiotherapy. The following CVD diamonds were investigated: (1) a batch of square 3 x 3 mm2 detectors cut from a CVD wafer and (2) an as-grown CVD wafer of 6 cm diameter. A total of 20 CVD square detectors were irradiated with 137Cs gamma rays over the dose range from 200 mGy to 25 Gy. The CVD wafer, used as a large-area thermoluminescent (TL) detector, was exposed to a 226Ra needle. Very few square detectors showed linearity over a limited dose range, followed by saturation of the TL signal. The dose range of linearity was found to be strongly affected by the thermal annealing procedure of the detector. Owing to its high sensitivity and homogeneity of response, the large CVD diamond wafer was found to be very suitable as a large-area detector for 2-D dose mapping of the 226Ra brachytherapy source, possibly for Quality Assurance purposes.


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