Speaker
Description
Belgium remains an important emitter of radioactive xenon into the atmosphere. These emissions are not harmful to the environment, but they can interfere with the very sensitive noble gas detection stations that are part of the verification regime of the Comprehensive Nuclear-Test-Ban Treaty Organization. Radioxenon stack emission data from civilian nuclear facilities, combined with atmospheric transport modelling, can help to discriminate real events (radioactive xenon detections that originate from a nuclear explosion) from false alarms (radioactive xenon detections that originate from a civilian nuclear facility). Besides the operational global meteorological models (e.g. ECMWF), we can also use high resolution numerical weather prediction (NWP) data from AROME to simulate the dispersion of noble gasses. In this work we will use the STAX data from the Fleurus site to simulate the noble gas concentrations, using the FLEXPART dispersion model coupled to both NWP data from ECMWF and AROME. Radioxenon activity concentration time series will be presented. The results will be compared with observations of the International Monitoring System and from analyzed data from the SAUNAIII measurements at a higher temporal resolution. Statistical scores will be calculated.
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