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The 4th international comparison on EPR dosimetry with tooth enamel Part 1: Report on the results
Ist Super Sanita.
Helmholtz Zentrum Muenchen.
Linköping University, Department of Medical and Health Sciences, Radiation Physics. Linköping University, Faculty of Health Sciences.
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2011 (English)In: Radiation Measurements, ISSN 1350-4487, Vol. 46, no 9, 765-771 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents the results of the 4th International Comparison of in vitro electron paramagnetic resonance dosimetry with tooth enamel, where the performance parameters of tooth enamel dosimetry methods were compared among sixteen laboratories from all over the world. The participating laboratories were asked to determine a calibration curve with a set of tooth enamel powder samples provided by the organizers. Nine molar teeth extracted following medical indication from German donors and collected between 1997 and 2007 were prepared and irradiated at the Helmholtz Zentrum Munchen. Five out of six samples were irradiated at 0.1, 0.2, 0.5, 1.0 and 1.5 Gy air kerma; and one unirradiated sample was kept as control. The doses delivered to the individual samples were unknown to the participants, who were asked to measure each sample nine times, and to report the EPR signal response, the mass of aliquots measured, and the parameters of EPR signal acquisition and signal evaluation. Critical dose and detection limit were calculated by the organizers on the basis of the calibration-curve parameters obtained at every laboratory. For calibration curves obtained by measuring every calibration sample three times, the mean value of the detection limit was 205 mGy, ranging from 56 to 649 mGy. The participants were also invited to provide the signal response and the nominal dose of their current dose calibration curve (wherever available), the critical dose and detection limit of which were also calculated by the organizers.

Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 46, no 9, 765-771 p.
Keyword [en]
Electron paramagnetic resonance (EPR), Tooth enamel, Detection limit, Retrospective dosimetry
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-72666DOI: 10.1016/j.radmeas.2011.05.001ISI: 000296039300007OAI: diva2:461119
Funding Agencies|EC project SOUL|FIP6R-516478|Available from: 2011-12-02 Created: 2011-12-02 Last updated: 2013-09-10

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Adolfsson, EmelieGustafsson, HåkanIsraelsson, AxelLund, Eva
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