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Radiation Protection Dosimetry 108:33-45 (2004)
© 2004 © Oxford University Press 2004; all rights reserved

Calibration of dosemeters used in mammography with different X ray qualities: Euromet Project No. 526

J. Witzani1,*, H. Bjerke2, F. Bochud3, I. Csete4, M. Denoziere5, W. de Vries6, K. Ennow7, J. E. Grindborg8, C. Hourdakis9, A. Kosunen10, H. M. Kramer11, F. Pernicka12 and T. Sander13

1 Bundesamt für Eich- und Vermessungswesen (BEV), Arltgasse 35, A-1160 Vienna, Austria
2 Norwegian Radiation Protection Authority (NRPA), PO Box 55, N-1332 Østerås, Norway
3 Institut Universitaire de Radiophysique Appliquée (IRA), Grand-Pré 1, CH-1007 Lausanne, Switzerland
4 Országos Mérésügyi Hivatal (OMH), Németvölgyi út 37–39, H-1124 Budapest, Hungary
5 Laboratoire Central des Industries Electriques (BNM-LCIE), 33, avenue du Général Leclerc F-92260 Fontenay-aux-Roses, France
6 NMi Van Swinden Laboratorium (NMi), Princetonplein 1, NL-3584 CC Utrecht, The Netherlands
7 National Institute of Radiation Hygiene (SIS), Knapholm 7, DK-2730 Herlev, Denmark
8 Swedish Radiation Protection Authority (SSI), S-17116 Stockholm, Sweden
9 Hellenic Ionizing Radiation Calibration Laboratory (HIRCL), Agia Praskevi 153 10 Attiki, Greece
10 Radiation and Nuclear Safety Authority (STUK), PO Box 14, FIN-00881 Helsinki, Finland
11 Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, D-38116 Braunschweig, Germany
12 International Atomic Energy Agency (IAEA), Wagramer Strasse, A-1020 Vienna, Austria
13 National Physical Laboratory (NPL), Queens Road, Teddington TW11 0LW, UK

* Corresponding author: E1{at}metrology.at

The effect of different X ray radiation qualities on the calibration of mammographic dosemeters was investigated within the framework of a EUROMET (European Collaboration in Measurement Standards) project. The calibration coefficients for two ionization chambers and two semiconductor detectors were established in 13 dosimetry calibration laboratories for radiation qualities used in mammography. They were compared with coefficients for other radiation qualities, including those defined in ISO 4037–1, with first half value layers in the mammographic range. The results indicate that the choice of the radiation quality is not crucial for instruments with a small energy dependence of the response. However, the radiation quality has to be chosen carefully if instruments with a marked dependence of their response to the radiation energy are calibrated.


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