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Radiation Protection Dosimetry Advance Access published online on April 27, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci586
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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

COMPARISON OF TWO EXTREMITY DOSEMETERS BASED ON LiF:Mg,Cu,P THIN DETECTORS FOR MIXED BETA-GAMMA FIELDS

M. Ginjaume 1 *, S. Pérez 1, X. Ortega 1, and M. A. Duch 1

1 Institute of Energy Technology (INTE), Technical University of Catalonia (UPC), Diagonal 647, 08028 Barcelona, Spain

* To whom correspondence should be addressed.
M. Ginjaume, E-mail: merce.ginjaume{at}upc.es


  Abstract

Two types of thin LiF:Mg,Cu,P detectors, GR-200F and MCP-Ns, have been characterised for use in the design of an extremity dosemeter for mixed beta-photon radiation fields. Both detectors consist of an extremely thin layer of sensitive material with effective thicknesses of 5 and 8 mg cm-2, respectively, held in a 5 mg cm-2 PVC ring holder. Dosimetric performance was analysed according to the ISO 12794 standard and compared with 240 mg cm-2 TLD-100 measurements. In particular, the energy response was obtained for ISO narrow X-ray spectra, 137Cs, 60Co, 204Tl and 90Sr/90Y. From these measurements a mean calibration factor was calculated to estimate Hp(0.07). Subsequently, the performance of the dosemeters was checked for a set of 10 different mixed photon and beta-photon fields. The study shows that the proposed dosemeters can estimate Hp(0.07) in a wide range of mixed beta-photon fields with a maximum deviation from the given dose of 30% and an overall uncertainty of the order of 25% (k = 1). However, the results also highlight a large variability among the different thin detectors and, thus, the standard TLD-100 material is recommended whenever the workplace does not include low-energy beta radiation.


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M. Ginjaume, S. Perez, and X. Ortega
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