MICRODOSIMETRIC MEASUREMENT OF SECONDARY RADIATION IN THE PASSIVE SCATTERED PROTON THERAPY ROOM OF iTHEMBA LABS USING A TISSUE-EQUIVALENT PROPORTIONAL COUNTER
| Autor: | J.E. Symons, Filip Vanhavere, Charlot Vandevoorde, S. Chiriotti, Alessio Parisi, M. De Saint-Hubert, E de Kock, P. Beukes, Jacobus P. Slabbert |
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| Rok vydání: | 2018 |
| Předmět: |
Models
Anatomic Materials science Proton Proportional counter Radiation 030218 nuclear medicine & medical imaging 03 medical and health sciences South Africa 0302 clinical medicine Optics Radiation Protection Proton Therapy Humans Scattering Radiation Radiology Nuclear Medicine and imaging Radiometry Proton therapy Radiological and Ultrasound Technology business.industry Equivalent dose Public Health Environmental and Occupational Health Isocenter General Medicine 030220 oncology & carcinogenesis Electromagnetic shielding Radiation protection business |
| Zdroj: | Radiation protection dosimetry. 182(2) |
| ISSN: | 1742-3406 |
| Popis: | Measurements of the dose equivalent at different distances from the isocenter of the proton therapy center at iThemba LABS were previously performed with a tissue-equivalent proportional counter (TEPC). These measurements showed that the scattered radiation levels were one or two orders of magnitude higher in comparison to other passive scattering delivery systems. In order to reduce these radiation levels, additional shielding was installed shortly after the measurements were done. Therefore, the aim of this work is to quantify and assess the reduction of the secondary doses delivered in the proton therapy room at iThemba LABS after the installation of the additional shielding. This has been performed by measuring microdosimetric spectra with a TEPC at 11 locations around the isocenter when a clinical modulated beam of 200 MeV proton was impinging onto a water phantom placed at the isocenter. |
| Databáze: | OpenAIRE |
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