Absorbed fractions for electrons and beta particles in spheres of various sizes
- Cooper Hospital, Univ. Medical Hospital, Camden, NJ (United States)
The use of electron-emitting radionuclides in tumor imaging and therapy has presented some new challenges to conventional radiation dosimetry. The fraction of electron energy absorbed in most source regions has usually been assumed to be unity. In small structures such as localized tumors or isolated regions containing moderate to high energy electron emitters, however, this may not always be the case. Using an extension of Berger`s scaled absorbed dose distributions for point sources to represent a spherical geometry, absorbed fractions of electron energy for sources uniformly distributed in spheres of various sizes have been calculated. Beta particle and monoenergetic electron energies studied range from 0.025 to 4.0 MeV and sphere masses range from 0.01 to 1000 g. S values have also been calculated for {sup 90}Y, {sup 123}I and {sup 131}I based on the results of the absorbed fraction calculations. These calculated absorbed fractions are valuable in estimating electron energy loss from small spherical structures and may be useful in estimating the radiation dose to these small volumes. 9 refs., 2 figs., 3 tabs.
- DOE Contract Number:
- AC05-76OR00033
- OSTI ID:
- 114815
- Journal Information:
- Journal of Nuclear Medicine Technology, Vol. 35, Issue 1; Other Information: PBD: Jan 1994
- Country of Publication:
- United States
- Language:
- English
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