Search results for: Klaus Lützenkirchen

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article

A method for the mg scale separation of curium(III) from americium(III) by HPLC using a SCX column

Nidhu Lal Banik, Klaus Lützenkirchen, Rikard Malmbeck, Adrian Nichol

Journal of Radioanalytical and Nuclear Chemistry > 2019 > 321 > 3 > 841-849

A method intended for the mg scale separation of curium (Cm) from americium (Am) and plutonium (Pu) based on high pressure liquid chromatography using a strong cation exchange column has been investigated. Reproducible separations were achieved on the Luna SCX (Phenomenex) column with α-hydroxymethylbutyric acid (α-HMBA) as eluant. The separation performance was investigated on the tracer level varying...

chapter

Analytical Chemistry of Plutonium*

Kenton J. Moody, Dawn A. Shaughnessy, Karin Casteleyn, Herbert Ottmar, more

The Chemistry of the Actinide and Transactinide Elements > 3889-4003

In 1940, shortly after the discovery of fission, McMillan and Abelson studied the recoil range of fission products induced by neutrons incident on a thin uranium foil (McMillan, 1939; McMillan and Abelson, 1940). While fission products were mostly ejected from the foil, two activities were significantly retained, one with a half-life of 23 min and the other with a half-life of 2.3 days.

article

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.

article

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...

article

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.

article

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...

article

Composite uranium carbide targets at TRIUMF: Development and characterization with SEM, XRD, XRF and L-edge densitometry

Peter Kunz, Pierre Bricault, Marik Dombsky, Nicole Erdmann, more

Journal of Nuclear Materials > 2013 > 440 > 1-3 > 110-116

The production of radioactive ion beams (RIB) from spallation targets by irradiation with a continuous 500MeV proton beam, has been routine at TRIUMF for several years. Based on the experience with composite refractory carbide targets a procedure for the fabrication of UC ₂ /C targets was developed. It includes the preparation of UC ₂ by carbothermal reduction of UO ₂ , the...

article

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...

article

Stability of Divalent Europium in an Ionic Liquid: Spectroscopic Investigations in 1-Methyl-3-butylimidazolium Hexafluorophosphate

Isabelle Billard, Gilles Moutiers, Alexandre Labet, Antoine El Azzi, more

Inorganic Chemistry > 2003 > 42 > 5 > 1726 - 1733

article

Fluorescence of UO ₂ ² ⁺ in a non-complexing medium: HClO ₄ /NaClO ₄ up to 10 M

Isabelle Billard, Anne Rustenholtz, Laurent Sémon, Klaus Lützenkirchen

Chemical Physics > 2001 > 270 > 2 > 345-354

Time-resolved laser-induced fluorescence spectroscopy has been used to study the properties of excited UO ₂ ² ⁺ ions (fluorescence lifetimes and emission spectra) in aqueous solutions of non-complexing HClO ₄ and NaClO ₄ (up to a total concentration of 10 M). An increasing amount of HClO ₄ (NaClO ₄ ) leads to an increase (decrease) of the fluorescence...

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Search results for: Klaus Lützenkirchen

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