| Zugriffsnummer | 16821 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Half-life measurements with ionization chambers - a study of systematic effects and results |
| Autor(in); Institution |
Schrader, Heinrich; 6.11, Aktivitätseinheit und Messverfahren, PTB-Braunschweig
|
| Quelle/Jahr | Proceedings of the 14th International Conference on Radionuclide Metrology and its Applications, ICRM 2003. Applied Radiation and Isotopes: 60 (2004), 2-4, 317 - 323 |
| ISSN | 0969-8043 |
| Verlag | Amsterdam [u.a.]: Elsevier |
| Konferenzangaben | 14th International Conference on Radionuclide Metrology and its Applications, ICRM 2003, Dublin, 2-6, June, 2003, Ireland |
| Zusammenfassung | Accurate half-lives have been determined at the Physikalisch-Technische Bundesanstalt (PTB) using ionization-chamber measuring systems to assure the quality of radioactivity standards over the period of their use as detector calibrants or other purposes such as in nuclear medicine and for environmental monitoring. Some long-lived radionuclides have been measured for up to 28 years: 85Kr, 90Sr, 108Agm, 133Ba, 152Eu, 154Eu, and more recently, 65Zn, 106Ru, 109Cd, and 137Cs, but also short-lived radionuclides have also been studied such as: 18F, 67Ga, 81Rb, 99Mo, 99Tcm, 103Pd, 111In, 123I, 131I, 153Sm, 169Er, 177Lu, 186Re, 188Re, 201Tl, 222Rn and 224Ra. Relative uncertainties of half-life values of the order of 5×104 were obtained and the limiting systematic effects are discussed. These values are compared to other measurement results and evaluations. |
