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Open Access Green as soon as Postprint is submitted to ZB.
An unattended device for high-voltage sampling and passive measurement of thoron decay products.
Rev. Sci. Instruments 85:022103 (2014)
An integrating measurement device for the concentration of airborne thoron decay products was designed and calibrated. It is suitable for unattended use over up to several months also in inhabited dwellings. The device consists of a hemispheric capacitor with a wire mesh as the outer electrode on ground potential and the sampling substrates as the inner electrode on +7.0 kV. Negatively charged and neutral thoron decay products are accelerated to and deposited on the sampling substrates. As sampling substrates, CR39 solid-state nuclear track detectors are used in order to record the alpha decay of the sampled decay products. Nuclide discrimination is achieved by covering the detectors with aluminum foil of different thickness, which are penetrated only by alpha particles with sufficient energy. Devices of this type were calibrated against working level monitors in a thoron experimental house. The sensitivity was measured as 9.2 tracks per Bq/m³×d of thoron decay products. The devices were used over 8 weeks in several houses built of earthen material in southern Germany, where equilibrium equivalent concentrations of 1.4–9.9 Bq/m³ of thoron decay products were measured.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
thoron, progeny, high voltage, CR39, solid-state nuclear track detector; Radon; Progeny; Dwellings; Sensors; China; Dtps; Air
ISSN (print) / ISBN
0034-6748
e-ISSN
1089-7623
Journal
Review of Scientific Instruments
Quellenangaben
Volume: 85,
Issue: 2,
Article Number: 022103
Publisher
American Institute of Physics (AIP)
Publishing Place
Melville
Non-patent literature
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Reviewing status
Peer reviewed