The discrimination between the highly variable radioxenon background caused by normal operations of nuclear facilities and CTBT-relevant events is a challenging but crucial task. For this reason, the radioxenon background at IMS noble gas systems must be sufficiently characterized and understood. The scientific methods and software tools to do this can still be significantly enhanced. This presentation summarizes relevant scientific project line-outs that would serve this purpose and make use of atmospheric transport modelling (ATM). These include methods for associating multiple samples to the same release event, provision of higher source location estimates, developing of the screening flag “ATM backtracking to known sources”, corrections to ATM in case of systematic discrepancies between observed and simulated concentrations from a known source due to complex terrain, land sea breeze, and mountains, as well as the use of isotopic ratio measurements for screening. For each of these possible projects, the atmospheric radioxenon measurement data required for developing and validating the methods and tools is described. These build on IMS noble gas measurements possibly supplemented by data from temporary experiments with transportable noble gas measurement systems.
This presentation describes possible scientific projects to develop among others methods for asociating multiple samples to the same radionuclide release event, for backtracking to known sources. It describes what radioxenon measurement data are required to validate the results.