SAMOP 2023 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Poster
MS 7.13: Poster
Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof
Preparation of a Pa-233 tracer for accelerator mass spectrometry of Pa-231 in environmental samples — •Janis Wolf, Astrid Barkleit, Sebastian Fichter, Robin Steudtner, and Anton Wallner — Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
The measurement of Pa-231 (t1/2 = 3.28· 104 a) by accelerator mass spectrometry (AMS) has many applications including nuclear forensics, U/Pa dating and radiological risk assessment of the U-235 decay chain. The measurement requires the addition of an isotopic spike and as Pa-231 is the only long-lived Pa isotope, the short-lived isotope Pa-233 (t1/2 = 26.98 days) is used. This enables the measurement of the isotopic ratio Pa-231/Pa-233 and monitoring of the efficiency of the sample preparation and measurement procedure.
The Pa-233 spike is typically separated from a solution of its long-lived mother nuclide Np-237 using an ion-exchange resin. Due to the tendency of Pa to attach to surfaces, different procedures for this separation are tested with the aim to find a procedure with high Pa-233 yields that can be performed quickly and without additional safety precautions during AMS sample preparation.