Dosimetric properties of an applicator system for intraoperative electron-beam therapy utilizing a Clinac--18 accelerator

Journal Article · Mon Mar 01 04:00:00 EST 1982 · Med. Phys.; (United States)

DOI:https://doi.org/10.1118/1.595162· OSTI ID:5654441

McCullough, E C; Anderson, J A

A prototype electron applicator system providing circular and rectangular fields for use in intraoperative electron beam therapy with a Varian Clinac 18 linear accelerator has been fabricated. The dosimetric properties of this system for a variety of electron-beam energies, applicator sizes, and x-ray collimator settings was documented. Significant findings include: (a) surface dose values are in excess of 90% for electron energies of 12 MeV and above; (b) for the 18-MeV beam, the deepest depth where the central axis dose is 90% of its maximum value is in excess of 50 mm for circular applicators whose diameters are in excess of 5 cm; and (c) the treatment time to deliver 1000 rads ''given dose'' (at a given dose rate of 300 MU/min) is on the order of 3--4 min. Cross-field behavior is acceptable for the intended application and x-ray contamination is less than 4% for any applicator/electron energy combination. A system for irregular field blocking and TLD verification dosimetry has been developed.

• Research Organization: Division of Radiation Therapy, Department of Oncology, Mayo Clinic/Foundation, Rochester, Minnesota 55901
• OSTI ID: 5654441
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 9:2; ISSN MPHYA
• Country of Publication: United States
• Language: English

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