Clinical brachytherapy with neutron emitting {sup 252}Cf sources and adherence to AAPM TG-43 dosimetry protocol
- Department of Radiation Oncology, Harper Hospital, Barbara Ann Karmanos Cancer Institute, Wayne State University, Detroit, Michigan 48201 (United States)
- Chemical Technology Division, Radiochemical Engineering Development Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
Using Monte Carlo methods, neutron dosimetry for {sup 252}Cf Applicator Tube (AT) type medical sources available from Oak Ridge National Laboratory (ORNL) has for the first time been determined in terms of TG-43 formalism. This approach, as compared to previous {open_quotes}along-away{close_quotes} formalisms, demonstrates the relative angular independence of dose rate data, when the geometry factor has been removed. As the ORNL-made {sup 252}Cf AT type sources are considerably physically larger than most clinical sources used today, the radial dose function increases for radii less than 3.0 mm due to breakdown of the line source model. A comparison of the {sup 252}Cf neutron radial dose function with those for other medical sources revealed similarities with that from {sup 137}Cs. Differences with respect to previous {sup 252}Cf AT source neutron dosimetry data generally increased at increasing distances. This was attributed to differences in the various {sup 252}Cf AT source models and phantom compositions. The current status of {sup 252}Cf medical source fabrication and calibration procedures at ORNL is presented. {copyright} {ital 1999 American Association of Physicists in Medicine.}
- OSTI ID:
- 292714
- Journal Information:
- Medical Physics, Vol. 26, Issue 1; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
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