| Popis: |
On July 1, 1986, just short of 7 years from the date of contract award. The UCLA Neutron Therapy Facility began patient treatment. The facility, one of four supported by The National Cancer Institute neutron therapy clinical trials program, uses a 46 MeV negative-ion-proton cyclotron and the reaction {p, Be(26)} [the target is sufficiently thick to absorb 26 MeV of the incident proton energy], to create a spectrum of neutrons having a mean energy of approximately 20 MeV. Dosimetric calibration of the beam is performed using A-150. “Tissue Equivalent Plastic” ion chambers and the methods contained in The AAPM Task Group 18, Neutron Dosimetry Protocol. Clinical treatment planning is accomplished using the Tissue Air Ratio techniques developed for photon dosimetry and adapted for the UCLA neutron spectrum. Dosimetric results and clinical experience up to the time of presentation will be discussed. |
