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Radiation Protection Dosimetry Advance Access published online on September 18, 2009
Radiation Protection Dosimetry, doi:10.1093/rpd/ncp182
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

SPECIFIC ABSORBED FRACTIONS FOR INTERNAL ELECTRON EMITTERS DERIVED FOR A SET OF ANATOMICALLY REALISTIC REFERENCE PREGNANT FEMALE MODELS

Bingqi Guo1, X. George Xu2 and Chengyu Shi1,*

1 Radiation Oncology, University of Texas Health Science Center at San Antonio, Ste G240, San Antonio, TX 78229, USA
2 Nuclear Engineering and Engineering Physics Program, Rensselaer Polytechnic Institute, Troy, NY 12180, USA

* Corresponding author: shic{at}uthscsa.edu

Received June 16, 2009, amended August 3, 2009, accepted August 25, 2009

The specific absorbed fraction ({Phi}), defined by the Medical Internal Radiation Dose Committee, is generally applied to evaluate the average absorbed dose in a target organ as a result of radioactive materials deposited in a source organ. This paper reports a new set of {Phi} values for internal electron emitters ranging from 10 keV to 4 MeV from various internal organs of the mother to the fetus based on three newly developed pregnant female tomographic models, called RPI-P3, RPI-P6 and RPI-P9. The results show a linear log relationship between {Phi} values and electron energy. The linear log coefficients have been derived and reported. The relationship between {Phi} values and mean distances between source organs and the fetus were also determined to allow for individual dosimetry. Since the RPI-P models have finer details of human anatomy and more realistic organ volumes and geometries, which follow the latest ICRP reference values, the newly derived {Phi} values could be used as reference values in determination of the dose to the fetus from internal electron emitters.


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