| Zugriffsnummer | 16909 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Measurement of absorbed dose to water for low and medium energy X rays |
| Autor(in); Institution |
Kramer, Hans-Michael; 6.2, Dosimetrie für Strahlentherapie und Diagnostik, PTB-Braunschweig
|
| Quelle/Jahr | Standards and codes of practice in medical radiation dosimetry : proceedings of an international symposium held in Vienna, Austria, 25 - 28 November 2002: 1 (2003), 159 - 175 |
| Schriftenreihe | STI/PUB: 1153 |
| Herausgeber(in) |
IAEA, International Atomic Energy Agency, Vienna, Austria
|
| ISSN | 0074-1884 |
| ISBN | 92-0-111403-6 |
| Verlag | Vienna: International Atomic Energy Agency |
| Konferenzangaben | International Symposium on Standards and Codes of Practice in Medical Radiation Dosimetry, Vienna, 25-28, November, 2002, Austria |
| Freie Schlagworte | Absorbed dose to water for low and medium energy x-rays ; graphite extrapolation chamber ; auger electrons ; replacement factor |
| Zusammenfassung | For low energy and medium energy X rays, that is for tube voltages of up to 100 kV or starting at 100 kV, the dosimetric quantity of interest in this paper is the absorbed dose to water at the surface of a water phantom or at a depth of 2 cm, sometimes 5 cm, in a water phantom, respectively. In the first part of this paper the principle methods by which these quantities can be determined with the aid of calibrated ionization chambers are described. The second part is devoted to an absolute measurement of the absorbed dose to water for medium energy X rays. The method is based on the use of an extrapolation chamber inside a graphite phantom. The steps for converting the electrical charge collected in the measuring volume to the absorbed dose to graphite are outlined, together with the steps leading from absorbed dose to graphite to absorbed dose to water in a water phantom. The method presented is used for determining what is known in X-ray dosimetry as the ionization chamber replacement effect. Document: IAEA-CN-96/15 |
