München 2006 – wissenschaftliches Programm

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AKA: Physik und Abrüstung

AKA 1: Kernwaffenteststoppvertrag

AKA 1.4: Vortrag

Mittwoch, 22. März 2006, 15:30–16:00, L

Radioactivity measurements in air for CTBT verification: Experiences and Perspectives — •Matthias Zähringer, Jacqueline Bieringer, Sabine Schmid, Hartmut Sartorius, and Clemens Schlosser — Bundesamt für Strahlenschutz, Rosastr. 9 , 79098 Freiburg

The International Monitoring System (IMS) for the verification of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) is currently deployed. It will provide a unique global measuring system. Airborne particulate radioactivity will be monitored at 80 stations world-wide. Radioxenon will be monitored at 40 stations out of these. The German Federal Office for Radiation Protection BfS operates the IMS station RN33 at Schauinsland mountain. An automatic system for measuring particulate radioactivity is operational since July 2003. Results are presented and interpreted. An experimental Xenon sampler and analyser is also in operation since February 2004. The measurements performed hitherto demonstrate the detection capabilities of the IMS. The Schauinsland station shows an anthropogenic background that is typical for mid latitude locations in the northern hemisphere. Nuclear power plants and other civil sources provide a background of approximately 1mBq of 133Xe and as well as sporadic No-dqspikesNo-dq with activities up to 250mBq in daily samples. Typically, other xenon isotopes than 133Xe are detected in these elevated samples. These isotopes are of particular interest. Implications of the data on source identification and location are discussed.