INVESTIGATION OF THE VOLATILISATION OF RECOIL PRODUCTS FROM IONIC CRYSTALS

Des matériaux polycristallins furent dotés des produits de recul provenant de la fission de l'uranium-235 par des neutrons. La volatilisation de Xe, I, Tc et Te fut examinée par des expériences isothermes et non isothermes, et le phénomène de dégagement est discuté. Les courbes isothermes peuvent être approchées par une fonction traçant une réaction du 2e genre ou de pseudo-2e genre. Les données Tmax, qui peuvent être dérivées du thermogramme, dépendent du degré du chauffage, de la composition du courant de gaz et sont fortement influencées par les matériaux ioniques mis en œuvre comme matière réceptrice. Ces effets sont discutés phénoménologiquement.Polycrystalline materials were doped with recoil products formed in 235U (n,f)- reactions. In isothermal and non isothermal experiments the volatilisation of Xe, I, Tc and Te was examined and the release phenomena are discussed. The isothermals can be approached mathematically by a function which describes a 2nd order or a pseudo 2nd order reaction. The Tmax values, which can be derived from the thermograms, depend on the heating rate, the composition of the streaming gas, and are strongly influenced by the ionic matrices used as stopping materials. These effects are discussed phenomenologicall

A new certified reference material for the quality control of palladium, road dust, BCR-723

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Aufloesung von Plutoniumdioxid bei der Nassverbrennung von Plutonium-haltigen Abfaellen mit Schwefelsaeure und Verfahren zur Abtrennung von Plutonium aus schwefelsauren Loesungen Schlussbericht

With 10 refs., 21 tabs., 18 figs.SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

The EU network on trace element speciation in full swing

cited By 8International audienceThe EC-funded thematic network 'Speciation 21' links scientists in analytical chemistry working in method development for the chemical speciation of trace elements, and potential users from industry and representatives of legislative agencies, in the field of environment, food and occupational health and hygiene. The network covers a number of important issues including organotin compounds, chromium and nickel species, chemical characterisation of environmental and industrial particulate samples, risk assessment, selenium and a series of other essential and toxic elements in food, as well as the influence of packing materials. Once the analytical methodology for the measurement of the trace element species has been optimised, the importance of trace element speciation will grow enormously. Food sciences, material sciences, medicine and occupational health, environmental sciences and related fields will all profit. The network will also substantially promote the dissemination of knowledge through the member states. (C)2000 Elsevier Science B.V

Characterization of calibration solutions for the KfK K-edge densitometer and the hybrid K-edge/K-XRF solution assay system Joint Programme on the Technical Development and Further Improvement of IAEA Safeguards between the Government of the Federal Republic of Germany and the International Atomic Energy Agency. Task C2. Task C.17

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman