| Zugriffsnummer | 21048 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Calorimetric determination of kQ factors for NE 2561 and NE 2571 ionization chambers in 5 cm × 5 cm and 10 cm × 10 cm radiotherapy beams of 8 MV and 16 MV photons |
| Autor(in); Institution |
Krauss, Achim; 6.2, Dosimetrie für die Strahlentherapie, PTB-Braunschweig
Kapsch, Ralf-Peter; 6.2, Dosimetrie für die Strahlentherapie, PTB-Braunschweig
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| Quelle/Jahr | Physics in Medicine and Biology: 52 (2007), 19, 6243 - 6259 |
| ISSN | 0031-9155 |
| DOI | |
| Verlag | Bristol: IOP Publishing |
| Freie Schlagworte | kQ factors ; water calorimeter ; high-energy photon beams ; field size |
| Zusammenfassung | The relative uncertainty of the ionometric determination of absorbed dose to water, Dw, in the reference dosimetry of high-energy photon beams is in the order of 1.5% and is dominated by the uncertainty of the calculated chamber- and energy-dependent correction factors kQ. In the present investigation, kQ values were determined experimentally in 5 cm × 5 cm and 10 cm × 10 cm radiotherapy beams of 8 MV and 16 MV bremsstrahlung by means of a water calorimeter operated at 4 °C. Ionization chambers of the types NE 2561 and NE 2571 were calibrated directly in the water phantom of the calorimeter. The measurements were carried out at the linear accelerator of the Physikalisch-Technische Bundesanstalt (PTB). It is shown that the kQ factor of a single ionization chamber can be measured with a standard uncertainty of less than 0.3 %. No significant variations of kQ were found for the different lateral sizes of the radiation fields used in this investigation. Corrigendum (table 2, p. 6255): Physics in Medicine and Biology: 53 (2008), 1, 1151 - 1152 |
| Relation |
https://doi.org/10.1088/0031-9155/53/4/c01 – (Corrigendum)
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Zitierung
Krauss, A. & Kapsch, R.-P. (2007). Calorimetric determination of kQ factors for NE 2561 and NE 2571 ionization chambers in 5 cm × 5 cm and 10 cm × 10 cm radiotherapy beams of 8 MV and 16 MV photons. Physics in Medicine and Biology, 52(19), 6243–6259. https://doi.org/10.1088/0031-9155/52/20/011