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AGA: Arbeitsgruppe Physik und Abrüstung
AGA 1: Nuclear Safeguards
AGA 1.3: Vortrag
Mittwoch, 7. März 2018, 16:00–16:30, B 0.014
Detection of nuclear reprocessing activities using Kr85 — •Pablo Woelk, Markus Kohler, Carsten Sieveke, Simon Hebel, Ergin Simsek, Christoph Becker, Klaus Sengstock, and Gerald Kirchner — Universität Hamburg, Deutschland
An increased concentration of the isotope Kr85 in atmospheric air samples combined with atmospheric calculations is an excellent indicator for detecting nuclear reprocessing activities.
For an effective detection, small sample sizes and a high sample throughput rate are necessary. These factors place high demand on the measuring technology.
Our Atom Trap Trace Analysis (ATTA) experiment aims to measure the concentration with a magneto-optical trap. This method allows to capture specific isotopes and is sensitive to the part-per-trillion level.
Established implementations using the ATTA method allow high sensitivity but have a limited sample throughput rate, since the vacuum chambers need to be flushed after each measurement to avoid cross contamination due to the RF-driven excitation into the metastable state. Here, however, we are producing metastable Kr all-optically, avoiding cross contamination.
Our experiment includes the entire measuring chain. Besides the actual concentration measurement this includes an in-house developed autonomous air sampling as well as automated sample preparation.