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Radioactivity: Discover the lowest amounts with new methods
Date:9/16/2008

o the otherwise possible separation of the aerosol particle at surfaces of the chamber, on the other hand. The thoron progenies which mainly accumulate on the aerosol particles, shall be measured analogously by measuring the radon progenies after their separation by means of wire meshes (free fraction) or filters (fraction attached on aerosol partiles) in a follow-up product measuring set-up. By simultaneous spectrometry of the α- and γ-radiation emitted from the sample, quantifying of all thoron progenies as well as traceability of the measurement to the national activity standard is guaranteed.

2. Improvements of low-level gamma-ray Spectrometry Systems at UDO

Abstract: The Physikalisch-Technische Bundesanstalt (PTB), the German metrology institute, operates various low-background gamma-ray spectrometry systems at the underground laboratory (UDO) in the Asse salt mine, near Braunschweig. The experiences gained with these detector systems within ten years of operation lead to various changes and improve-ments of the experimental installations. In 2004, the whole UDO facility had to be moved within the Asse mine from its former location at a depth of 925 m to the present depth of 490 m. At its new location, the radon activity concentration in air (about 60 Bq/m3) is by a factor of three higher than at the 925 m level. Therefore, it became necessary to signifi-cantly improve the shielding against radon, at least for the most sensitive detector system. This radon shield consist of an almost air-tight box which surrounds the whole passive shielding (the latter is composed of 20 cm of lead and 10 cm of electrolytic copper). In addi-tion, an improved nitrogen flashing of the inner volume of the detector chamber was realized by changes of the design. At the same time, the end-cap of this detector was exchanged with the aim to reduce the inherent background of the system (especially from 40K). The background characteristics achieved wit
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Contact: Dr. Dirk Arnold
dirk.arnold@ptb.de
Physikalisch-Technische Bundesanstalt (PTB)
Source:Eurekalert

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