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Radiation Protection Dosimetry Advance Access originally published online on February 7, 2006
Radiation Protection Dosimetry 2006 121(2):195-201; doi:10.1093/rpd/ncl008
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

TECHNICAL NOTE

Sensitivity loss of Lif:Mg,Cu,P thermoluminescence dosemeters caused by oven annealing

M. Lüpke1, F. Goblet1, B. Polivka2 and H. Seifert1,*

1 University of Veterinary Medicine Hannover, Foundation, Institute for General Radiology and Medical Physics, Bischofsholer Damm 15, Building 102, D-30173 Hannover, Germany
2 University of Ulm, Department of Radiotherapy, Robert-Koch-Strasse 6 D-89081 Ulm, Germany

* Corresponding author: hermann.seifert{at}tiho-hannover.de

Received July 19, 2005, amended December 16, 2005, accepted December 19, 2005


  Abstract

LiF:Mg,Cu,P is a very sensitive thermoluminescence material that can be used for personal dosimetry in radiology. But if this material is heated too much during annealing or reading it quickly loses its sensitivity. This study shows that an annealing oven in wide use can cause thermal damage to the dosemeters owing to inhomogeneous temperature distribution in the annealing tray. At annealing temperatures >240°C, differences of only 1°C lead to significant losses of sensitivity. Therefore, it is necessary to measure the distribution of temperature in the annealing tray for correct placement of the dosemeters in the tray.


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