| Zugriffsnummer | 12409 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | The PTB underground laboratory for dosimetry and spectrometry |
| Autor(in); Institution |
Neumaier, Stefan; 6.32, Dosimetrie in der Umwelt, PTB-Braunschweig
Arnold, Dirk; 6.12, Umweltradioaktivität, PTB-Braunschweig
Böhm, Jürgen; 6.2, Dosimetrie für Strahlentherapie und Diagnostik, PTB-Braunschweig
Funck, Eberhard; 6.32, Dosimetrie in der Umwelt, PTB-Braunschweig
|
| Quelle/Jahr | Applied Radiation and Isotopes: 53 (2000), 173 - 178 |
| ISSN | 0969-8043 |
| Konferenzangaben | ICRM low-level radioactivity measurement techniques conference, Mol, October, 1999, Belgium |
| Freie Schlagworte | underground laboratory ; dosimetry ; low-level γ-spectrometry |
| Zusammenfassung | In 1991, the Physikalisch-Technische Bundesanstalt established an underground laboratory for dosimetry and spectrometry (UDO) at the Asse salt mine, near Braunschweig. Due to the depth of 925 m below ground (equivalent to about 2100 m of water), the cosmic ray muon intensity in this facility is reduced by more than 5 orders of magnitude. In addition, the low specific activity of the pure rock salt and a low concentration of radon lead to an extremely low ambient dose equivalent rate of less than 1 nSv/h. The UDO facility is therefore well suited for dosimetry at very low doses rates, as well as for Ultra-Low-Background (ULB) γ-ray spectrometry. In 1998, a coaxial low-background HPGe-detector (88% relative efficiency, FWHM 2.0 keV at 1.33 MeV) with an extended shielding (20 cm low-activity lead, 1 cm electrolytic copper, N2-flushing) was installed at UDO; the count rate per mass of germanium, integrated over the energy range from 40 to 2750 keV, was measured to be 0.012 s-1 kg-1 Results from test measurements and first applications are reported. The design of a ULB γ-detector system, presently under conctruction, is described. |
