## 4 Conclusions  
The objective of this work was to numerically investigate the activation of eight metal foils placed at the JET outer long-term irradiation station during the C40 (Tritium) and C41 (Deuterium Tritium Experiment 2) campaigns. This was achieved by constructing a complex irradiation scenario based on the daily DT and DD neutron yields used in the experiment installation sessions. Numerical estimations of the induced activities after the end of irradiation are important for the optimization of the methodology for handling activated components, such as the activation foils. The FISPACT-II code and the EAF-2010 and TENDL-2021 nuclear data libraries were used for the calculations. In the comparison results, some significant discrepancies were observed between the niobium and gold results. The initial niobium activity, primarily from Nb94m resulting from the Nb93(n,g) reaction, peaks within minutes of cooling. Within the first month, Nb92m, produced from Nb93(n,2n), becomes the dominant contributor. Despite its comparable activity to gold, manganese, and silver, niobium's dose rate is significantly lower. TENDL-2021 exhibits lower activity compared to EAF-2010, with these differences attributed to its smaller reaction cross-sections. Surprisingly, the cross-sections for the peak 14 MeV energy are higher for TENDL-2021 compared to EAF-2010 and are more true to the experimental data obtained by [PERSON] et al. [24]; however, TENDL-2021 has a dip in cross-section values in the range 2 MeV-10 MeV compared to EAF-2021, as it follows the experimental data by [PERSON] [25] for up to 2.5 MeV. There are also discrepancies in the fast neutron and thermal neutron resonance ranges. After two years, TENDL-2021 shows increased activity, primarily due to Nb93m, which is negligible in EAF-2010. Gold exhibits the second highest activity and dose rate post-irradiation, with its peak activity sustained for approximately one week. Au198, stemming from the Au197(n,g) reaction and with a half-life of around 2.7 days, dominates gold activation. Metastable isotopes with varying excitation energies also contribute to this. Notably, gold experiences the most significant decline in activity after two years of cooling. In EAF-2010, gold's activity decreases less than in TENDL-2021, primarily due to an increased production of Au195, which is the most relevant isotope during the first year of cooling. The dose rates for gold also differ noticeably. Initially, variations in the estimation of Au198 contribute to these differences, but over longer cooling periods, Au195 emerges as the responsible isotope. The key findings are as follows:  
* The highest levels of activity after the end of irradiation were observed in the rhodium foil, followed by the gold and silver foils. * The highest levels of activity after two years of cooling were present in the silver foil, followed by the nickel and manganese and nickel alloy foils. * The highest dose rates after the end of irradiation were observed in the gold foil, followed by the silver and nickel manganese foils. * The highest dose rates after two years of cooling were observed in the silver foil, followed by the manganese nickel and rhodium foils.