Conveners
Rn Detection and Mitigation
- Hardy Simgen (Max-Planck-Institut für Kernphysik)
The noble gas radon and its decay products can significantly contribute to the background in experiments searching for rare events. Consequently, many experiments implement dedicated radon mitigation strategies, which are fundamentally supported by high sensitivity radon screening techniques. This talk will review the motivation for radon screening and provide an overview of high sensitivity...
With the installation of rare event search experiments in underground laboratories, good passive and active shielding measures, careful material selection and surface treatments, radioactive isotopes in the xenon of xenon-based rare event search experiments have become the most important underground source in the search for rare events besides solar and atmospheric neutrinos. Particularly...
In the pursuit of ultra-low background experiments, minimizing radon levels is crucial. This research presents significant advancements in radon detector sensitivity, surface treatment technologies, and radon removal systems. We achieved a background level of 0.07 ± 0.03 mBq in a 7.4L chamber and 0.03 ± 0.01 mBq in a 12.33L chamber. Various surface treatments, including epoxy coating, mylar...
For rare event searches using liquid xenon detectors, radon-induced background represents the most significant contribution. Specifically, 222-Rn, a decay product of 226-Ra found in all materials, enters the detector's active region by emanation from the material surfaces. To meet the sensitivity requirements for the next generation of detectors, this background must be reduced by about one...
Radon is one of the most important radioactive backgrounds in low energy and very rare events experiments in particle and astroparticle physics like neutrinoless double beta decay or dark matter direct research. A concentration of few radon atoms per m3 or per kg will be mandatory in future experiments. Capturing radon at these very low levels require the use of very effective adsorbents. At...
This work summarize different approaches that were carried out in the Modane Underground Laboratory (LSM). In this work the simulation of Radon daughter implantation on different surfaces is presented. The work compares a Geant4 based approach to the SRIM code . This lies in the simulation of the nucllear recoil on a metal plate. The different materials are tested respectively to radon...
