| Título: | Scatter factors and peak scatter factors for cobalt-60, 6 MV, 10, and 18 MV photon beams |
| Autores: | Abdel-Rahman, Wamied. |
| Fecha: | 1999 |
| Publicador: | McGill University - MCGILL |
| Fuente: |
 |
| Tipo: | Electronic Thesis or Dissertation |
| Tema: | Physics, Radiation. |
| Descripción: |
The aim of external beam radiotherapy is to deliver a prescribed dose to a target volume accurately and uniformly while sparing the surrounding healthy tissue. In radiation dosimetry calculations, many functions are employed to achieve this goal, and the Peak Scatter Factor (PSF) is one of the fundamental functions used in dosimetry. A brief background of some of the basic physics employed in external beam radiotherapy is given, illustrating some of the applications of the PSF in dosimetry. Also, the evolution of the definition of the PSF is discussed by presenting the PSF definitions quoted in several dosimetric references. In addition, concerns debated among physicists regarding the consistency of tabulated values of the PSF in dosimetric references with the definition of the PSF are presented. A practical method for measuring the PSF for megavoltage photon beams is developed. The method is applied to Co-60, 6 MV, 10 MV, and 18 MV photon beams using water, polytyrene, and solid water phantoms. The measured PSFs are compared to tabulated PSF and Normalized Peak Scatter Factors (NPSF) published in the British Journal of Radiology (BJR), supplement 25. |
| Idioma: | en |
1 Investigations on the form-genera Beauveria and Tritirachium por MacLeod, Donald Murdock | 6 Treatment and recovery in first-episode psychosis : a qualitative analysis of client experiences por Windell, Deborah L. |
2 Seismic sensitivity of tall guyed telecommunication towers. por Ghodrati Amiri, Gholamreza. | 7 |
3 Exploring the Relationship Between Assets and Family Stress Among Low-Income Families por Rothwell, David W.,Han, Chang-Keun | 8 |
4 The case for asset-based interventions with indigenous peoples: Evidence from Hawai‘i por Rothwell, David W. | 9 |
5 Second Thoughts: Who Almost Participates in an IDA Program? por Rothwell, David W.,Han, Chang-Keun | 10 Recent contributions to the phenomenology of musical time : a critical survey por Beaudreau, Pierre |