Köln 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MS: Fachverband Massenspektrometrie
MS 9: Actinide Analysis
MS 9.5: Vortrag
Donnerstag, 13. März 2025, 18:45–19:00, HS 2 Chemie
Isotopic purification of trans-uranium tracers using RIMS at RISIKO and their characterization with AMS (II) — •Dominik Koll1,2, Sebastian Fichter2, Michael Hotchkis3, and Anton Wallner1,2 — 1TUD Dresden University of Technology, Dresden, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 3Australian Nuclear Science and Technology Organisation, Lucas Heights, Australia
Ultra-sensitive accelerator mass spectrometry is regularly used to quantify low levels of actinide concentrations as well as isotopic ratios in environmental samples. Actinide quantification relies on a relative measurement to an added mono-isotopic spike of the respective element. Standard solutions are available at the required purity (up to 10−7) for elements such as U, Pu and Am. However, no corresponding commercial high-purity spike solution exists so far for the trans-uranium elements Np and Cm. In this project, we establish a novel isotopic purification and characterization of isotopic spikes using a combination of RIMS and AMS starting with 248Cm and later extending it to 236Np.
Here, we present the characterization of an isotopically purified 248Cm spike using AMS. A dilution series of purified 248Cm with the initial 248Cm solution containing certified amounts of Cm isotopes was measured for isotopic ratios to quantify the purified 248Cm amount. High-sensitivity measurements of the purified spike were carried out for A=244,247 isotopes to assess the isotopic purity. A suppression factor of about 300 for the neighbouring isotope 247Cm was achieved.
Keywords: AMS; RIMS; Actinides; Curium; Neptunium