Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 72: Experimental techniques in astroparticle physics III
T 72.6: Vortrag
Mittwoch, 17. März 2021, 17:15–17:30, Tv
Production and characterization of a 226Ra implanted stainless steel radon source — •Florian Jörg1, Hardy Simgen1, and Guillaume Eurin1,2 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Present Address: IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
Future liquid xenon detectors require unprecedented low levels of intrinsic radioactive backgrounds. Particularly, 222Rn represents a background source threatening the design goals for the experiments sensitivity. Therefore extensive radon screening campaigns as well as studies on novel approaches for radon mitigation need to be carried out. Both of which crucially depend on infrastructure allowing to measure radon at very low activities. For the correct quantification of detection efficiencies as well as radon mitigation factors, reliable sources of known and stable radon emanation are necessary.
A new approach to produce clean and dry radon sources by implantation of 226Ra ions into stainless steel has been investigated. In a proof of principle study, two 4 cm2 large stainless steel plates have been implanted in collaboration with the ISOLDE facility located at CERN. Results from a first characterization of the sources will be presented. Measurements using electrostatic radon monitors and miniaturized proportional counters showed a 222Rn emanation rate of about 2 Bq for each sample. Additional measurements using HPGe screening, alpha spectroscopy as well as measurements of their radon emanation rate at varying temperatures and pressures were carried out.