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Influence of energy and angular spread on stopping-power ratios for electron beams
| Content Provider | Scilit |
|---|---|
| Author | Andreo, P. Brahme, A. Nahum, A. Mattsson, O. |
| Copyright Year | 1989 |
| Description | Journal: Physics in Medicine & Biology The influence of energy and angular spread at the phantom surface of the water/air stopping-power ratios for electron beams has been studied using the Monte Carlo method. Calculated $s_{w.air}$ values for beams with most probable energies around 10 MeV and energy and angular spread of different widths as well as low-energy electron contamination have been compared with 10 MeV monoenergetic and plane-parallel beams. Variations in the calculated $s_{w.air}$ values of up to 1.6% at the depth of maximum absorbed dose have been obtained. The energy and angular spreads cover the interval generally occupied by clinical beams. A simple correction factor for the influence of energy and angular spread on the stopping-power ratio is proposed which only requires the dose fall-off gradient in a broad beam as input parameter. Most dosimetry protocols select water/air stopping-power ratios as a function of the mean energy at the phantom surface and the depth of measurement. Results obtained with such a procedure have been compared with Monte Carlo calculated depth-dose curves and corresponding slowing-down spectra and stopping-power ratios for clinical beams. |
| Related Links | http://iopscience.iop.org/article/10.1088/0031-9155/34/6/010/pdf |
| Ending Page | 768 |
| Page Count | 18 |
| Starting Page | 751 |
| ISSN | 00319155 |
| e-ISSN | 13616560 |
| DOI | 10.1088/0031-9155/34/6/010 |
| Journal | Physics in Medicine & Biology |
| Issue Number | 6 |
| Volume Number | 34 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 1989-06-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Physics in Medicine & Biology Monte Carlo Monte Carlo Method Stopping Power Electron Beam |
| Content Type | Text |
| Resource Type | Article |
| Subject | Radiology, Nuclear Medicine and Imaging Radiological and Ultrasound Technology |
