SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session II: Metal substrates II
O 18.6: Poster
Montag, 1. März 2021, 13:30–15:30, P
Study of tritium uptake in thin palladium-titanium-gold films by Beta-Induced X-ray Spectrometry — •Max Aker1, Sonja Schneidewind2, Sebastian Vetter1, Chirstian Goffing1, and Magnus Schlösser1 — 1Institute for Astroparticle Physics, Karlsruhe Institute of Technology — 2Institute of Nuclear Physics, University of Münster
Metallic multilayer-systems are promising materials for tritium storage utilizable for passive tritium pumps, dedicated radioisotope heat sources, or calibration standards for the analysis of tritium in solids. Beta-Induced X-ray Spectrometry (BIXS) is a technique for tritium activity measurements and depth profiling in solids.
BIXS was used for activity measurements on Pd/Ti/Au multilayers in air which were tritiated at T2 pressures up to 0.7 mbar. The measurements were complemented by activity quantifications using liquid scintillation counting. Combined with GEANT4 simulations the activity determination in samples consisting of three different metals with total thicknesses up to 300 nm and activities of 104 Bq to 108 Bq was accomplished. Pd/Ti/Au systems are interesting for tritium capture studies since Ti allows a quasi-irreversible tritium capture at room temperature, Pd prevents the formation of an oxide barrier on the Ti, and Au has low permeation to tritium, but increases the BIXS detection efficiency due to high stopping power. The findings on the influence of T2 pressure, Pd layer thickness and bake-out on the final activity and its stability in the sample are reported in this poster.