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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 1: Verification I: Simulation and Technologies

AGA 1.3: Vortrag

Mittwoch, 13. März 2019, 15:00–15:30, U HS 3 Parkstr. 6

Detection of nuclear reprocessing activities using Kr-85 — •Ergin Simsek, Carsten Sieveke, Pablo Woelk, Svenja Sonder, Malte Peters, and Markus Kohler — Carl Friedrich von Weizsäcker-Centre for Science and Peace Research (ZNF), Hamburg, Germany

An increased concentration of the isotope Kr-85 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. Therefore, the Atom Trap Trace Analysis (ATTA) group at Hamburg University focuses on middle to long range measurement techniques combined with the magneto-optical trapping (MOT) method to analyze samples down to the parts-per-trillion level.

Established implementations using the ATTA method allow for high sensitivity but have a limited sample throughput rate, since the vacuum chambers are subject to cross contamination due to the RF-driven excitation into the metastable state. The all-optical approach of the Hamburg ATTA avoids cross contamination.

Our experiment includes the entire chain of analysis. Besides the actual concentration measurement this includes an in-house developed and built autonomous air sampling device as well as automated sample preparation.