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Radiation Protection Dosimetry Advance Access originally published online on April 27, 2006
Radiation Protection Dosimetry 2006 120(1-4):83-86; doi:10.1093/rpd/nci597
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Application of different TL detectors for the photon dosimetry in mixed radiation fields used for BNCT

B. Burgkhardt1, P. Bilski2, M. Budzanowski2, R. Böttger3, K. Eberhardt4, G. Hampel4, P. Olko2 and A. Straubing1

1 FZK (Forschungszentrum Karlsruhe), Hermann-Helmholtz-Platz 1, 76344 Leopoldshafen, Germany
2 IFJPAN (Institute of Nuclear Physics) Krakow, ul. Radzikowskiego 152, 31-342 Krakow, Poland
3 PTB (Physikalisch-Technische Bundesanstalt), Bundesallee 100, 38116 Braunschweig, Germany
4 Johannes Gutenberg-Universität Mainz, Saarstrasse 21, 55099 Mainz, Germany

* Corresponding author: bertram.burgkhardt@hs.fzk.de

Different approaches for the measurement of a relatively small gamma dose in strong fields of thermal and epithermal neutrons as used for Boron Neutron Capture Therapy (BNCT) have been studied with various thermoluminescence detectors (TLDs). CaF2:Tm detectors are insensitive to thermal neutrons but not tissue-equivalent. A disadvantage of applying tissue-equivalent 7LiF detectors is a strong neutron signal resulting from the unavoidable presence of 6Li traces. To overcome this problem it is usual to apply pairs of LiF detectors with different 6Li content. The experimental determination of the thermal neutron response ratio of such a pair at the Geesthacht Neutron Facility (GeNF) operated by PTB enables measurement of the photon dose. In the experimental mixed field of thermal neutrons and photons of the TRIGA reactor at Mainz the photon dose measured with different types of 7LiF/natLiF TLD pairs agree within a standard uncertainty of 6% whereas the CaF2:Tm detectors exhibit a photon dose by more than a factor of 2 higher. It is proposed to determine suitable photon energy correction factors for CaF2:Tm detectors with the help of the 7LiF/natLiF TLD pairs in the radiation field of interest.


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