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MS: Fachverband Massenspektrometrie
MS 9: Actinide Analysis
MS 9.4: Vortrag
Donnerstag, 13. März 2025, 18:30–18:45, HS 2 Chemie
Isotopic purification of trans-uranium tracers using RIMS at RISIKO and their characterization with AMS (I) — •Raphael Hasse1, Sebastian Berndt1, Christoph E. Duellmann1,2,3, Sebastian Raeder2, and Klaus Wendt1 — 1Johannes Gutenberg-Universität Mainz, Mainz, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 3Helmholtz-Institut Mainz, Mainz, Germany
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 this novel isotopic purification approach, carried out at the RISIKO laser mass separator facility in Mainz, using element and isotope selective resonance ionization by two tuneable Ti:Sa lasers. For suitable isotopic purification of a 248Cm spike, an efficient two step ionization scheme was developed. In this way, an overall efficiency well above 10% with a suppression of the neighbouring isotope 247Cm by about 300 was achieved.
Keywords: AMS; RIMS; Actinides; Curium; Neptunium