| Zugriffsnummer | 15967 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Development of a calibration facility for measurements of the thoron activity concentration |
| Autor(in); Institution |
Gargioni, Elisabetta; 6.12, Umweltradioaktivität, PTB-Braunschweig
Honig, Anja; 6.12, Umweltradioaktivität, PTB-Braunschweig
Röttger, Annette; 6.12, Umweltradioaktivität, PTB-Braunschweig
|
| Quelle/Jahr | Nuclear Instruments and Methods in Physics Research A: 506 (2003), 1/2, 166 - 172 |
| ISSN | 0168-9002 |
| Verlag | Amsterdam: North-Holland, Elsevier |
| Freie Schlagworte | Thoron ; Activity concentration ; Calibration |
| Zusammenfassung | A new calibration facility for measuring the thoron (220Rn) activity concentration in air is currently being developed at the Physikalisch-Technische Bundesanstalt (PTB). The system consists of a reference chamber of well-defined volume and several electrodeposited 228Th sources. In order to produce and maintain a homogeneous and constant activity concentration, a flow field is created inside the reference chamber and monitored. The 220Rn activity concentration is measured with a multi-wire ionisation chamber (MWIC) operating in pulse mode and externally connected to the reference chamber. With this method thoron fields with activity concentrations ranging from 1 to 10 kBq/m3 are presently produced with an overall relative standard uncertainty of less than 5 %. |
