Abstract
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 dmax was observed when electrons were eliminated from the beam.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 18-24 |
| Number of pages | 7 |
| Journal | Medical physics |
| Volume | 10 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1983 |
| Externally published | Yes |
Keywords
- computerized simulation
- contamination
- depth dose distributions
- doseâresponse relationships
- dosimetry
- e codes
- electrons
- geometry
- linear accelerators
- mev range
- monte carlo method
- phantoms
- photon beams
- polystyrene
- showers
ASJC Scopus subject areas
- Biophysics
- Radiology Nuclear Medicine and imaging