Photon absorbed fractions for cylindrical geometry: homogeneous nonradioactive cylinder containing a homogeneous cylindrical distribution of activity

The purpose of this study was to calculate photon absorbed fractions in tissue surrounding a radioactive source where both the source and the surrounding tissue are assumed to have cylindrical geometry. Specifically, we treated two cases: the case of a cylindrical source of homogeneous activity plac...

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Bibliographic Details
Published inMedical physics (Lancaster) Vol. 23; no. 8; p. 1447
Main Authors Dreesen, J A, Dumitru, D I, Fearon, T C, Kushner, D C
Format Journal Article
LanguageEnglish
Published United States 01.08.1996
Subjects
Brachytherapy
Humans
Mathematics
Models, Structural
Phantoms, Imaging
Photons
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Summary:The purpose of this study was to calculate photon absorbed fractions in tissue surrounding a radioactive source where both the source and the surrounding tissue are assumed to have cylindrical geometry. Specifically, we treated two cases: the case of a cylindrical source of homogeneous activity placed in air, and second, the case of a cylindrical source of homogeneous activity placed in a cylindrical nonradioactive absorbing material. In this study we offer an analytical solution to these problems followed by numerical integration. The computer program allowed for very general calculations, e.g., different tissues, different geometrical setups. Tables of absorbed fractions have been developed for commonly used radionuclide energies and tissue-equivalent material. A comparison between our results and the results of other related studies showed the advantages and limitations of this approach.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.597727