A STRIKING EFFECT OF TRITIUM RETENTION IN GRAPHITE PROTECTION TILES

The work presents the first complete depth profiling distributions measurements of tritium retention in carbon protection tiles employed in fusion devices. An unexpected Tritium retention on the backside of the protection tiles was determined that is dependent on the tile thickness. On the tile sidewalls the retention increases from the surface towards the backside. The accumulation of tritium on the backside was found to be ca. 3 orders of magnitude greater than in the bulk. The experimental data were determined and confirmed by Accelerator Mass Spectrometry (AMS) and Full Combustion followed by liquid scintillation counting of tritium.