Showing papers by "Jost Eikenberg published in 2001"
TL;DR: A fast procedure based on sorption of Ra on MnO2 coated polyamide discs is presented for determination of radium isotopes in aqueous samples, sufficiently sensitive to allow the investigation of Ra isotope relationships in aquifers at typical environmental levels.
86 citations
TL;DR: In this article, the authors used the 230 Th/ 234 U ingrowth system to determine the geochemical evolution of a freshwater limestone cave system located in central Switzerland (Hell Grottoes at Baar/Zug), young postglacial tufaceous limestone and travertine precipitates.
51 citations
TL;DR: The bulk chemical analyses suggest that the surface waters in the Rhine valley can be described as mixtures between Ca-Na-HCO3-rich ground water and less mineralized slightly acidic river waters which have migrated through crystalline (mainly granitic) basement rocks of the Vosges mountains.
31 citations
TL;DR: Three analytical techniques are presented which are used at PSI for determination of U and Th isotopes (234U, 235U, 238U, 228Th, 230Th, 232Th) in different materials as well as in urine for in vitro monitoring of potentially exposed workers.
Abstract: Three analytical techniques are presented which are used at PSI for determination of U and Th isotopes ( 234 U, 235 U, 238 U, 228 Th, 230 Th, 232 Th) in different materials, i.e. environmental samples (soils, minerals) and dental ceramics as well as in urine for in vitro monitoring of potentially exposed workers. Depending on the sample quantity available and/or required detection limits the measurements are performed either directly via gamma spectrometry or via alpha particle counting with preceding separation chemistry. The separation methods applied are based on either extraction chromatography or on sorption of U and Th on actinide selective resin. Following sample digestion, chemical yield spike additions ( 232 U, 229 Th or 228 Th), chemical purification and electro-depositional source preparation, alpha particle measurement is carried out using low-level alpha spectrometry. This technique allows detection limits of less than 0.2 mBq per counting source if the assay lasts over a few days and is therefore suitable for determination of trace quantities of short-lived 228 Th that can be hardly detected by means of mass spectrometric techniques.
4 citations