Phase II testing of Xenon International on Mount Schauinsland, Germany.

Station RN33 on Mount Schauinsland near Freiburg, Germany, is part of the International Monitoring System monitoring radioxenon in air ( ^131m Xe, ¹³³ Xe, ^133m Xe, and ¹³⁵ Xe) for verification of the Comprehensive Nuclear Test Ban Treaty. Here, we present data from phase II testing of a new system, Xenon International at RN33, July 14th, 2021 to Jan 22nd, 2022, together with SPALAX data from the same time period. Radioxenon could be detected in 473 of 719 samples, among them many multiple isotope detections. Activity concentrations of spiked and selected environmental samples were verified by laboratory reanalysis. The sensitivity of Xenon International for radioxenons is up to one order of magnitude better for the metastable isotopes than that of the SPALAX, with a shorter sampling duration of 6 h.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Michael Howard reports a relationship with Teledyne Brown Engineering Inc that includes: employment. Aaron Orr reports a relationship with Teledyne Brown Engineering Inc that includes: employment. Ryan Sayne reports a relationship with Teledyne Brown Engineering Inc that includes: employment. Editor of this journal - Andreas Bollhöfer.
(Copyright © 2022. Published by Elsevier Ltd.)