U.S. Department of Defense



P. Fattibene, Istituto Superiore di SanitàFollow
A. Wieser, Helmholtz Zentrum Muenchen
E. Adolfsson, Linköping University
L. A. Benevides, Naval Dosimetry Center
M. Brai, University of Palermo
F. Callens, Ghent University
V. Chumak, Research Center for Radiation Medicine AMS
B. Ciesielski, Medical University of Gdansk
S. Della Monaca, Regina Elena Institute
K. Emerich, Medical University of Gdansk
H. Gustafsson, Linköping University
Y. Hirai, Radiation Effects Research Foundation
M. Hoshi, Hiroshima University
A. Israelsson, Linköping University
A. Ivannikov, Medical Radiological Research Center
D. Ivanov, Institute of Metal Physics
J. Kaminska, Medical University of Gdansk
Wu Ke, Beijing Institute of Radiation Medicine
E. Lund, Linköping University
M. Marrale, University of Palermo
L. Martens, Ghent University
C. Miyazawa, Ohu Univesity
N. Nakamura, Radiation Effects Research Foundation
W. Panzer, Helmholtz Zentrum Muenchen
S. Pivovarov, Institute of Nuclear Physics
R. A. Reyes, Uniformed Services University of the Health Sciences
M. Rodzi, Hiroshima University
A. A. Romanyukha, Naval Dosimetry Center
A. Rukhin, Institute of Nuclear Physics
S. Sholom, Oklahoma State University
V. Skvortsov, Medical Radiological Research Center
V. Sepanenko, Medical Radiological Research Center
M. A. Tarpan, Ghent University
H. Thierens, Ghent University
S. Toyoda, Okayama University of Science
F. Trompier, Institut de Radioprotection et de Sûreté Nucléaire
E. Verdi, Helmholtz Zentrum Muenchen
K. Zhumadilov, Hiroshima University

Date of this Version



Published in Radiation Measurements 46 (2011) 765-771; doi:10.1016/j.radmeas.2011.05.001


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 München. 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.