Search results for: Gert Rasmussen

Items from 1 to 11 out of 11 results

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Uranium assay and trace element analysis of the fourth collaborative material exercise samples by the modified Davies-Gray method and the ICP-MS/OES techniques

Aubrey N. Nelwamondo, Lisa P. Colletti, Rachel E. Lindvall, Anna Vesterlund, more

Journal of Radioanalytical and Nuclear Chemistry > 2018 > 315 > 2 > 379-394

An international group of laboratories participating in CMX-4 subjected three samples to comparative nuclear forensic analysis using uranium assay and trace element analysis techniques to determine if the samples had similar or different origins. Uranium assay indicated that two pellet samples (ES-2 and ES-3) were nearly pure UO₂ while the black powder sample ES-1 was primarily UO₂ with UO₃ and/or...

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Titelbild: Uran aus deutschen Nuklearprojekten der 1940er Jahre – eine nuklearforensische Untersuchung (Angew. Chem. 45/2015)

Klaus Mayer, Maria Wallenius, Klaus Lützenkirchen, Joan Horta, more

Angewandte Chemie > 127 > 45 > 13331 - 13331

Nuklearforensik verfolgt die Spur zweier Uranblöcke zu den ersten deutschen Kernreaktionsexperimenten in den 1940er Jahren zurück. In der Zuschrift auf S. 13654 ff. vergleichen M. Wallenius et al. die makroskopischen Eigenschaften der Proben mit Literaturangaben, und sie bestimmen den Herstellungszeitpunkt und die Uranquelle.

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Uran aus deutschen Nuklearprojekten der 1940er Jahre – eine nuklearforensische Untersuchung

Klaus Mayer, Maria Wallenius, Klaus Lützenkirchen, Joan Horta, more

Angewandte Chemie > 127 > 45 > 13654 - 13658

Wir berichten hier über eine nuklearforensische Analyse verschiedener Uranmaterialien aus deutschen Nuklearprojekten der 1940er Jahre, bei denen Uranmetall in verschiedenen Geometrien verwendet wurde. Mithilfe des ²³⁰Th/²³⁴U‐Isotopenverhältnisses konnte für das Metall ein Produktionszeitraum von 1940 bis 1943 bestimmt werden. Die geographische Herkunft des Urans wurde anhand des Spurengehalts an Seltenerdelementen...

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Cover Picture: Uranium from German Nuclear Power Projects of the 1940s— A Nuclear Forensic Investigation (Angew. Chem. Int. Ed. 45/2015)

Klaus Mayer, Maria Wallenius, Klaus Lützenkirchen, Joan Horta, more

Angewandte Chemie International Edition > 54 > 45 > 13137 - 13137

Nuclear forensics was used to trace the history of two pieces of uranium metal, which are purported to originate from the first German nuclear reaction experiments in the 1940s. In their Communication on page 13452 ff., M. Wallenius et al. compared the macroscopic sample properties with literature information and determined the production date and source of the uranium samples.

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Uranium from German Nuclear Power Projects of the 1940s— A Nuclear Forensic Investigation

Klaus Mayer, Maria Wallenius, Klaus Lützenkirchen, Joan Horta, more

Angewandte Chemie International Edition > 54 > 45 > 13452 - 13456

Here we present a nuclear forensic study of uranium from German nuclear projects which used different geometries of metallic uranium fuel.3b,d, 4 Through measurement of the ²³⁰Th/²³⁴U ratio, we could determine that the material had been produced in the period from 1940 to 1943. To determine the geographical origin of the uranium, the rare‐earth‐element content and the ⁸⁷Sr/⁸⁶Sr ratio were measured...

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Thorium/uranium mixed oxide nanocrystals: Synthesis, structural characterization and magnetic properties

Damien Hudry, Jean-Christophe Griveau, Christos Apostolidis, Olaf Walter, more

Nano Research > 2014 > 7 > 1 > 119-131

One of the primary aims of the actinide community within nanoscience is to develop a good understanding similar to what is currently the case for stable elements. As a consequence, efficient, reliable and versatile synthesis techniques dedicated to the formation of new actinide-based nano-objects (e.g. nanocrystals) are necessary. Hence, a “library” dedicated to the preparation of various actinidebased...

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Attribution of uranium ore concentrates using elemental and anionic data

Elizabeth Keegan, Maria Wallenius, Klaus Mayer, Zsolt Varga, more

Applied Geochemistry > 2012 > 27 > 8 > 1600-1609

The capability to correctly identify the geological or geographical source of unknown uranium ore concentrates (UOCs) has obvious nuclear security benefits. This paper reports on a scoping study where the trace elemental and anionic compositions of 24 UOC samples, sourced mainly from mines in Australia and Canada, were examined for their ability to allow attribution of the sample to a particular geological...

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Production of ²³⁰ U/ ²²⁶ Th for Targeted Alpha Therapy via Proton Irradiation of ²³¹ Pa

Alfred Morgenstern, Ondrej Lebeda, Jan Stursa, Frank Bruchertseifer, more

Analytical Chemistry > 2008 > 80 > 22 > 8763 - 8770

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Nuclear forensic investigations with a focus on plutonium

Maria Wallenius, Klaus Lützenkirchen, Klaus Mayer, Ian Ray, more

Journal of Alloys and Compounds > 2007 > 444-445 > Complete > 57-62

Since the beginning of the 1990s when the first seizures of nuclear material were reported, the IAEA has recorded over 200 cases of illicit trafficking of nuclear materials. Despite the decreasing frequency of nuclear material seizures, particularly the ones involving weapons-grade material, the issue continues to attract public attention and is a reason for concern due to the hazard associated with...

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Detection of trace radioisotopes in soil, sediment and vegetation by glow discharge mass spectrometry

Maria Betti, Stefania Giannarelli, Tania Hiernaut, Gert Rasmussen, more

Analytical and Bioanalytical Chemistry > 1996 > 355 > 5-6 > 642-646

The possibility for the determination of some radioisotopes of cesium, strontium, plutonium, uranium and thorium by glow discharge mass spectrometry (GDMS) in soils, sediments and vegetations is investigated. The preparation of samples is described as a combination of the use of a conductive host matrix and a secondary cathode in order to decrease the dilution effect of the blending material for the...

article

Isotopic abundance measurements on solid nuclear-type samples by glow discharge mass spectrometry

Maria Betti, Gert Rasmussen, Lothar Koch

Analytical and Bioanalytical Chemistry > 1996 > 355 > 7-8 > 808-812

A double-focusing Glow Discharge Mass Spectrometer (GDMS) installed in a glovebox for nuclear sample screening has been employed for isotopic measurements. Isotopic compositions of zirconium, silicon, lithium, boron, uranium and plutonium which are elements of nuclear concern have been determined. Interferences arising from the matrix sample and the discharge gas (Ar) for each of these elements are...

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