| Zugriffsnummer | 19587 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Measurement of the x-ray mass energy-absorption coefficient of air using 3 keV to 10 keV synchrotron radiation |
| Autor(in); Institution |
Büermann, Ludwig; 6.6, Grundlagen der Dosimetrie, PTB-Braunschweig
Großwendt, Bernd; 6.6, Grundlagen der Dosimetrie, PTB-Braunschweig
Kramer, Hans-Michael; 6.2, Dosimetrie für die Strahlentherapie, PTB-Braunschweig
Selbach, Hans-Joachim; 6.2, Dosimetrie für die Strahlentherapie, PTB-Braunschweig
Gerlach, Martin; 7.1, Photonenradiometrie, PTB-Berlin
Hoffmann, Michael; 7.1, Photonenradiometrie, PTB-Berlin
Krumrey, Michael; 7.1, Photonenradiometrie, PTB-Berlin
|
| Quelle/Jahr | Physics in Medicine and Biology: 51 (2006), 20, 5125 - 5150 |
| ISSN | 0031-9155 |
| DOI | |
| URL | |
| Verlag | Bristol: IOP |
| Freie Schlagworte | photon mass energy-absorption coefficients of air ; W-value of electrons in dry air ; effective W-value of photons in dry air ; monochromatized synchrotron radiation ; cryogenic radiometer ; free air ionization chamber |
| Zusammenfassung | For the first time absolute photon mass energy-absorption coefficients of air in the energy range 3 keV to 10 keV have been measured with relative standard uncertainties less than 1%, significantly smaller than those of up to 5% assumed hitherto for calculated data. Monochromatized synchrotron radiation was used to measure both the total radiant energy by means of silicon photodiodes calibrated against a cryogenic radiometer and the fraction of radiant energy that is deposited in dry air by means of a free air ionization chamber. The measured ionization charge was converted into energy absorbed in air by calculated effective W values of photons as a function of their energy based on new measurements of the W values in dry air for electron kinetic energies between 1 keV and 7 keV, also presented in this work. The measured absorption coefficients were compared with state-of-the art calculations and found to agree within 0.7% with data calculated earlier by Hubbell at energies above 4 keV but were found to differ by values up to 2.1% at 10 keV from more recent calculations of Seltzer. |
Zitierung
Büermann, L., Großwendt, B., Kramer, H.-M., Selbach, H.-J., Gerlach, M., Hoffmann, M., & Krumrey, M. (2006). Measurement of the x-ray mass energy-absorption coefficient of air using 3 keV to 10 keV synchrotron radiation. Physics in Medicine and Biology, 51(20), 5125–5150. https://doi.org/10.1088/0031-9155/51/20/004