| Zugriffsnummer | 20156 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Characterization of the radiation quality of Co-60 therapy units by the fraction of air kerma attributable to scattered photons |
| Autor(in); Institution |
Chofor, N.; University Oldenburg, Working Group Medical Radiation Physics, Oldenburg, GERMANY; Pius-Hospital, Clinic of Radiotherapy and Oncology, Oldenburg, GERMANY
Looe, H. K.; University Oldenburg, Working Group Medical Radiation Physics, Oldenburg, GERMANY; Pius-Hospital, Clinic of Radiotherapy and Oncology, Oldenburg, GERMANY
Kapsch, Ralf-Peter; 6.2, Dosimetrie für die Strahlentherapie, PTB-Braunschweig
Harder, D.; University Göttingen, Medical Physics and Biophysics, Göttingen, GERMANY
Willborn, K. C.; Pius-Hospital, Clinic of Radiotherapy and Oncology, Oldenburg, GERMANY
Rühmann, A.; University Oldenburg, Working Group Medical Radiation Physics, Oldenburg, GERMANY; Pius-Hospital, Clinic of Radiotherapy and Oncology, Oldenburg, GERMANY
Poppe, B.; University Oldenburg, Working Group Medical Radiation Physics, Oldenburg, GERMANY; Pius-Hospital, Clinic of Radiotherapy and Oncology, Oldenburg, GERMANY
|
| Quelle/Jahr | Physics in Medicine and Biology: 52 (2006), 7, N137 - N147 |
| ISSN | 0031-9155 |
| DOI | |
| Verlag | Bristol: IOP Publishing |
| Freie Schlagworte | Strahlungsqualität ; Strahlentherapie ; Dosimetrie ; Streustrahlung |
| Zusammenfassung | In this work we present a new parameter for characterizing the emitted photon spectra of 60Co radiotherapy units. It is intended to propose this parameter for the revised DIN standard 6809-1. In the previous DIN regulation, it had been sufficient to state the nature of the radioactive material within the source. However, scatter processes within the radioactive material as well as the source housing and the collimator system influence the shape of the photon spectrum, with a noticeable contribution in the low-energy portion. The fraction of the air kerma for a given distance from the source, position and beam size in air comprising all contributions by scattered photons up to an upper energy limit for the emitted spectrum from 60Co decay, will be proposed as a typical parameter. The new quantity, which is termed the "fraction of air kerma attributable to scattered photons", PEScatter, has been calculated for 60Co devices. Not included in this new formalism is the air kerma contribution by scattered photons in between the two lines of the 60Co spectrum. A simple measurement procedure based on the signal ratio of two Farmer chamber detectors with different wall materials is discussed and its feasibility shown. |
Zitierung
Chofor, N., Looe, H. K., Kapsch, R.-P., Harder, D., Willborn, K. C., Rühmann, A., & Poppe, B. (2006). Characterization of the radiation quality of Co-60 therapy units by the fraction of air kerma attributable to scattered photons. Physics in Medicine and Biology, 52(7), N137–N147. https://doi.org/10.1088/0031-9155/52/7/n03