| Zugriffsnummer | 34602 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Calorimetric determination of the absorbed dose to water |
| Autor(in); Institution |
Krauss, Achim; 6.2, Dosimetrie für Strahlentherapie und Röntgendiagnostik, PTB-Braunschweig
|
| Quelle/Jahr | Ionizing radiation in medicine. PTB-Mitteilungen: 123 (2013), 2, Spec. Issue, 28 - 32 |
| ISSN | NO-ISSN |
| Verlag | Braunschweig: Physikal.-Techn. Bundesanstalt |
| Freie Schlagworte | Absorbed dose to water ; water calorimetry ; Co-60 radiation ; high-energy photon and electron radiation |
| Zusammenfassung | The absorbed dose to water DW is the basic measurand in dosimetry for radiation therapy. In clinical operation, this measurand is usually determined by means of dosemeters, e.g. by ionization chambers of different configurations or by semiconductor detectors which have been calibrated in terms of absorbed dose to water under reference conditions in a 10 cm × 10 cm extended 60Co radiation field. The calibration factors of these detectors are, thereby, traceable to PTB's primary standard measuring device for the realization of the unit of absorbed dose to water. PTB's primary standard measuring device is based on the use of a water calorimeter. The calorimeter is able to determine the absorbed dose to water at 60Co radiation under reference conditions with a combined standard measurement uncertainty of 0.2 %. Because the calorimetric determination of DW is basically carried out independent of the energy and of the type of radiation, further applications of water calorimetry as a standard measuring procedure for the determination of DW arise for a major part of the radiation qualities and radiation conditions used in external radiological therapy, e.g. for X-rays of medium energy, for heavy-ion radiation, or for high-energy photon and electron radiation. Original German version published in: PTB-Mitteilungen 123 (2013), No. 2 |
