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Radiation Protection Dosimetry Advance Access originally published online on June 7, 2007
Radiation Protection Dosimetry 2007 127(1-4):169-173; doi:10.1093/rpd/ncm268
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Skeletal absorbed fractions for electrons in the adult male: considerations of a revised 50-µm definition of the bone endosteum

W. E. Bolch1,*, A. P. Shah2, C. J. Watchman3, D. W. Jokisch4, P. W. Patton5, D. A. Rajon6, M. Zankl7, N. Petoussi-Henss7 and K. F. Eckerman8

1 Advanced Laboratory for Radiation Dosimetry Studies (ALRADS), Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, FL 32611-8300, USA
2 Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA
3 Department of Radiation Oncology, University of Arizona, Tucson, AZ 85721, USA
4 Department of Physics and Astronomy, Francis Marion University, Florence, SC 29501, USA
5 Department of Health Physics, University of Nevada Las Vegas, Las Vegas, NV 89154, USA
6 Department of Neurosurgery, University of Florida, Gainesville, FL 32611, USA
7 GSF-National Research Center for Environment and Health, Institute of Radiation Protection, Ingolstaedter Landstr. 1, 85764 Neuherberg, Germany
8 Oak Ridge National Laboratory, Life Science Division, Oak Ridge, TN 37831-6480, USA

* Corresponding author: wbolch{at}ufl.edu

In 1995, the International Commission on Radiological Protection (ICRP) issued ICRP Publication 70 which provided an extensive update to the physiological and anatomical reference data for the skeleton of adults and children originally issued in ICRP Publication 23. Although ICRP Publication 70 has been a valuable document in the development of reference voxel computational phantoms, additional guidance is needed for dose assessment in the skeletal tissues beyond that given in ICRP Publication 30. In this study, a computed tomography (CT) and micro-CT-based model of the skeletal tissues is presented, which considers (1) a 50-µm depth in marrow for the osteoprogenitor cells, (2) electron escape from trabecular spongiosa to the surrounding cortical bone, (3) cortical bone to trabecular spongiosa cross-fire for electrons and (4) variations in specific absorbed fraction with changes in bone marrow cellularity for electrons. A representative data set is given for electron dosimetry in the craniofacial bones of the adult male.


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