| Zugriffsnummer | 16907 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Recent developments and current status of air kerma standards |
| Autor(in); Institution |
Büermann, Ludwig; 6.203, Luftkerma-Normalmesseinrichtungen und Dosimetrie in der diagnostischen Radiologie, PTB-Braunschweig
Csete, I.; Orszagos Meresügyi Hivatal, Budapest, HUNGARY
|
| 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), 125 - 139 |
| 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 | Air kerma standards ; Gamma radiation ; X-rays ; Key comparison |
| Zusammenfassung | The current status of air kerma standards for kilovoltage X-rays and for 137Cs- and 60Co-γ radiation maintained at primary standard dosimetry laboratories is reviewed using results of the bilateral key comparisons between the air kerma standards of the BIPM and those of the national metrology institutes. Due to the reevaluation of kwall and kan, which are the correction factors for wall effects and axial beam non-uniformity for cavity ionization chambers, a significant increase of about 0.8 % in the realization of the gray for air kerma in both 137Cs and 60Co fields is to be expected. A consistent set of free-air chamber correction factors for electron loss, photon scatter, fluorescence and bremsstrahlung was calculated at the BIPM using state-of-the-art Monte Carlo methods for all free-air chamber standards in use worldwide. Consistent use of this set by all national metrology institutes would further improve the degree of equivalence of free-air chamber standards. Document: IAEA-CN-96/11 |
