Investigation of buildup dose from electron contamination of clinical photon beams
The contribution made by contaminating electrons present in a clinical photon beam to the buildup dose in a polystyrene phantom has been calculated and compared to measurements. A Monte Carlo technique was employed. The calculation was divided into two parts. First, the accelerator treatment head was simulated in detail using the EGS--PEGS electromagnetic shower code. Then, information obtained from these calculations was used to compute dose curves in a polystyrene phantom. Two cases were considered, one in which both electrons and photons were incident upon the phantom, and another in which electrons were eliminated from the incident beam. Results of these calculations agree with recent experimental findings. A decrease in buildup dose as well as a shift in d/sub max/ was observed when electrons were eliminated from the beam.
- Research Organization:
- Department of Physics and Cyclotron Laboratory, Harvard University, Cambridge, Massachusetts 02138
- OSTI ID:
- 6507685
- Journal Information:
- Med. Phys.; (United States), Vol. 10:1
- Country of Publication:
- United States
- Language:
- English
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DOSIMETRY
DEPTH DOSE DISTRIBUTIONS
DOSE-RESPONSE RELATIONSHIPS
PHANTOMS
PHOTON BEAMS
COMPUTERIZED SIMULATION
CONTAMINATION
POLYSTYRENE
E CODES
ELECTRONS
GEOMETRY
LINEAR ACCELERATORS
MEV RANGE
MONTE CARLO METHOD
SHOWERS
ACCELERATORS
BEAMS
COMPUTER CODES
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
LEPTONS
MATERIALS
MATHEMATICS
MOCKUP
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
RADIATION DOSE DISTRIBUTIONS
SIMULATION
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
SYNTHETIC MATERIALS
655003* - Medical Physics- Dosimetry