| Título: | Accurate radiation dosimetry using liquid- or air-filled plane-parallel ionization chambers |
| Autores: | Stewart, Kristin J. |
| Fecha: | 2001 |
| Publicador: | McGill University - MCGILL |
| Fuente: |
 |
| Tipo: | Electronic Thesis or Dissertation |
| Tema: |
Health Sciences, Radiology. Physics, Radiation. Biophysics, Medical. |
| Descripción: | To optimize delivery of radiation therapy treatments, accurate knowledge of absorbed dose in the clinical beam is essential. In this work we investigated issues related to the use of different types of ionization chambers for accurate radiation dosimetry. We determined values of Pwall at 60Co for plane-parallel chambers and used them to derive the conversion factors kecal k'R 50 or kQ for a 20 MeV electron beam. Our results agreed within 0.4% with kQ values given in the IAEA TRS-398 protocol, but differences of up to 1.8% were found between our kecalk' R50 values and those in the AAPM TG-51 protocol. We also investigated the behavior of two liquid-filled ionization chambers in megavoltage photon beams, examining stability, ion recombination and beam quality dependence. Methods for determining and correcting for recombination were investigated. Preliminary results show that the energy dependence of a liquid-filled chamber can typically be limited to less than 1% for megavoltage photon beams. |
| 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 |