Online chemical adsorption studies of Hg, Tl, and Pb on SiO2 and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA

Online gas-solid adsorption studies with single-atom quantities of Hg, Tl, and Pb, the lighter homologs of the superheavy elements (SHE) copernicium (Cn, Z =112), nihonium (Nh, Z =113), and flerovium (Fl, Z =114), were carried out using short-lived radioisotopes. The interaction with Au and SiO 2 surfaces was studied and the overall chemical yield was determined. Suitable radioisotopes were produced in fusion-evaporation reactions, isolated in the gas-filled recoil separator TASCA, and flushed rapidly to an adjacent setup of two gas chromatography detector arrays covered with SiO 2 (first array) and Au (second array). While Tl and Pb adsorbed on the SiO 2 surface, Hg interacts only weakly and reached the Au-covered array. Our results contribute to elucidating the influence of relativistic effects on chemical properties of the heaviest elements by providing experimental data on these lighter homologs

Elemental analysis of Morchella esculenta from Germany

A collaborative study to evaluate uptake of 137Csas well as trace-, minor-, and main elements in morels(Morchella esculenta) from various habitats in Germanywas undertaken by the help of active mushroom collectorsin Germany (http://www.pilzschule.de/). 137Cs determinedby gamma spectrometry was found in all specimen andfollowed the expected post-Chernobyl distribution. Elements,determined by prompt gamma and instrumentalNAA showed large variations without clear pattern distributedacross the country

Major and trace element geochemistry of the European Kupferschiefer — an evaluation of analytical techniques

Geochemical data, list of irradiation times and measured isotope

Verfahren und Vorrichtung zum Gasphasentransport von Metallelementen

Vorrichtung und Verfahren zum Erzeugen, Bereitstellen und Transportieren von Metallelementen in gasförmiger Phase, wobei das Trägergas Kohlenstoffmonoxid enthält und das Trägergas und die Metallelemente in einem Reaktionsvolumen zusammengeführt werden und die Metallelemente und Kohlenstoffmonoxid zu Metallelement-Carbonyl-Komplexen synthetisieren

In-situ formation, thermal decomposition, and adsorption studies of transition metal carbonyl complexes with short-lived radioisotopes

Abstract We report on the in-situ synthesis of metal carbonyl complexes with short-lived isotopes of transition metals. Complexes of molybdenum, technetium, ruthenium and rhodium were synthesized by thermalisation of products of neutron-induced fission of 249Cf in a carbon monoxide-nitrogen mixture. Complexes of tungsten, rhenium, osmium, and iridium were synthesized by thermalizing short-lived isotopes produced in 24Mg-induced fusion evaporation reactions in a carbon monoxide containing atmosphere. The chemical reactions took place at ambient temperature and pressure conditions. The complexes were rapidly transported in a gas stream to collection setups or gas phase chromatography devices. The physisorption of the complexes on Au and SiO2 surfaces was studied. We also studied the stability of some of the complexes, showing that these start to decompose at temperatures above 300 ℃ in contact with a quartz surface. Our studies lay a basis for the investigation of such complexes with transactinides.</jats:p

Rapid Synthesis of Radioactive Transition-Metal Carbonyl Complexes at Ambient Conditions

Carbonyl complexes of radioactive transition metals can be easily synthesized with high yields by stopping nuclear fission or fusion products in a gas volume containing CO. Here, we focus on Mo, W, and Os complexes. The reaction takes place at pressures of around 1 bar at room temperature, i.e., at conditions that are easy to accommodate. The formed complexes are highly volatile. They can thus be transported within a gas stream without major losses to setups for their further investigation or direct use. The rapid synthesis holds promise for radiochemical purposes and will be useful for studying, e.g., chemical properties of superheavy elements