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Radiation Protection Dosimetry Advance Access originally published online on March 15, 2007
Radiation Protection Dosimetry 2007 125(1-4):318-322; doi:10.1093/rpd/ncm187
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

TL detectors for gamma ray dose measurements in criticality accidents

Saveta Miljanic1,*, Benjamin Zorko2, Beatriz Gregori3 and Zeljka Knezevic1

1 Ruder Boskovic Institute, Bijenicka 54 10000 Zagreb, Croatia
2 Jozef Stefan Institute, Jamova 39 1000 Ljubljana, Slovenia
3 Autoridad Regulatoria Nuclear, Av. Libertador 8250 (C1429BNP) Buenos Aires, Republica Argentina

*Corresponding author: saveta{at}irb.hr

Determination of gamma ray dose in mixed neutron+gamma ray fields is still a demanding task. Dosemeters used for gamma ray dosimetry are usually in some extent sensitive to neutrons and their response variations depend on neutron energy i.e., on neutron spectra. Besides, it is necessary to take into account the energy dependence of dosemeter responses to gamma rays. In this work, several types of thermoluminescent detectors (TLD) placed in different holders used for gamma ray dose determination in the mixed fields were examined. Dosemeters were from three different institutions: Ruder Boskovic Institute (RBI), Croatia, Jozef Stefan Institute (JSI), Slovenia and Autoridad Regulatoria Nuclear (ARN), Argentina. All dosemeters were irradiated during the International Intercomparison of Criticality Accident Dosimetry Systems at the SILENE Reactor, Valduc, June 2002. Three accidental scenarios were reproduced and in each irradiation the dosemeters were exposed placed on the front of phantom and ‘free in air’. Following types of TLDs were used: 7LiF (TLD-700), CaF2:Mn and Al2O3:Mg,Y—all from RBI; CaF2:Mn from JSI and 7LiF (TLD-700) from ARN. Reported doses were compared with the reference values as well as with the values obtained from the results of all participants. The results show satisfactory agreement with other dosimetry systems used in the Intercomparison. The influence of different types of holders and applied corrections of dosemeters' readings are discussed.


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