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Radiation Protection Dosimetry Advance Access originally published online on March 6, 2008
Radiation Protection Dosimetry 2008 130(4):442-446; doi:10.1093/rpd/ncn069
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The depth-dependence of the biological effectiveness of 60Co gamma rays in a large absorber determined by dicentric chromosomes in human lymphocytes

Ernst Schmid1,*, Hartmut Roos1 and Hans-Michael Kramer2

1 Radiobiological Institute, University of Munich, 80336 Munich, Germany
2 Physikalisch-Technische Bundesanstalt (PTB), 38116 Braunschweig, Germany

* Corresponding author: Ernst.Schmid{at}lrz.uni-muenchen.de

Received December 14, 2007, amended January 29, 2008, accepted February 6, 2008

Radiobiological evidence is shown concerning a significant depth-dependence of the maximum relative biological effectiveness at limiting low doses (RBEM) of 60Co gamma rays in a cubic polymethylmethacrylate (PMMA) phantom of 30 cm edge length. Using the dose–response curve for the dicentric data in human lymphocytes obtained in the present experiment at a depth of 20 cm, together with the comprehensive and consistent data set determined earlier at smaller depths of the PMMA phantom, there is an increase in the RBEM value by a factor of 2.18 ± 1.25 at a depth of 20 cm relative to 1 cm in the phantom. All the dicentric data are based on identical exposure durations and irradiation temperatures as well as identical culture and evaluation conditions, with blood from the same donor.


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 Radiat Prot DosimetryHome page
S. Golfier, G. Jost, H. Pietsch, P. Lengsfeld, F. Eckardt-Schupp, E. Schmid, and M. Voth
DICENTRIC CHROMOSOMES AND {gamma}-H2AX FOCI FORMATION IN LYMPHOCYTES OF HUMAN BLOOD SAMPLES EXPOSED TO A CT SCANNER: A DIRECT COMPARISON OF DOSE RESPONSE RELATIONSHIPS
Radiat Prot Dosimetry, April 15, 2009; (2009) ncp061v1.
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