## 5 Results of the Inventory Calculations
The results for the \({}^{103}\)Pd and \({}^{169}\)Yb production in the irradiation unit are given in Figure 7. The duration of the irradiation campaign in both cases is 10 days and the number of the campaigns per year is 11. The commercial yield is accumulated within 0-95 cm and 0-60 cm of the radial depth in the cases of the \({}^{103}\)Pd and \({}^{169}\)Yb isotopes, respectively. The maximum specific activity can achieve 2.7 \(\times\) 10\({}^{10}\) Bq/g and 3.2 \(\times\) 10\({}^{12}\) Bq/g in the case of the \({}^{103}\)Pd and \({}^{169}\)Yb production, respectively, which corresponds 1.20 \(\times\) 10\({}^{1}\) TBq and 7.50 \(\times\) 10\({}^{1}\) TBq of the maximum yield. The commercial yields are 7.65 \(\times\) 10\({}^{1}\) TBq and 3.82 \(\times\) 10\({}^{2}\) TBq for these isotopes, respectively. The production of the \({}^{125}\)I and \({}^{131}\) isotopes is shown in Figure 8. The maximum specific activity that can be accumulated in the irradiation rods appears to be 6.5 \(\times\) 10\({}^{14}\) Bq/g and 4.4 \(\times\) 10\({}^{9}\) Bq/g for the \({}^{125}\)I and \({}^{131}\) isotopes, respectively. The irradiation campaigns are 10 and 35 days for these isotopes. The yields for the commercial consumption can be produced within 0-60 cm and 0-35 cm in the irradiations rods for iodine 125 and 131, respectively. The maximum yields of these isotopes are 2.60 \(\times\) 10\({}^{-1}\) TBq and 1.05 \(\times\) 10\({}^{3}\) TBq, and the commercial yields are 1.40 \(\times\) 10\({}^{0}\) TBq and 5.30 \(\times\) 10\({}^{3}\) TBq, respectively. The production of the long-lived \({}^{60}\)Co isotope is a challenging option for the DEMO irradiation unit because the typical irradiation campaign of 1.5-3 years exceeds the duration of the first operation phase of the DEMO. To address the uncertainty of the DEMO operation, the availability factor of 30% is applied to simulate the irradiation campaigns. For the present work, the duration of the neutron exposure for the \({}^{60}\)Co generation was assumed to be 1 calendar year to compare the results with the typical end productions from different world suppliers. It is evident that DEMO cannot provide comparable irradiation conditions with the fission reactors, but it might be an opportunity for the long-term irradiation campaigns during the second operation phase. Presented in Figure 9 are the results for the \({}^{60}\)Co and \({}^{90}\)Y production. In the latter case, the irradiation campaign was set to 10 calendar days. The maximum specific activities achieved in the irradiation rods are  
Figure 6: Accumulated specific activity of \({}^{99}\)Mo and \({}^{192}\)Ir isotopes: peak value and the radial distribution in the rods. \(2.4\times 10^{10}\) Bq/g (maximum yield is 3.15 \(\times\) 10\({}^{2}\)) and 2.4 \(\times\) 10\({}^{10}\) Bq/g (maximum yield is 6.00 \(\times\) 10\({}^{2}\) TBq) for \({}^{60}\)Co and \({}^{90}\)Y production, respectively. The commercial yield is produced within 0-5 cm and 0-35 cm for these two isotopes, and the corresponding yields amount to 6.00 \(\times\) 10\({}^{2}\) TBq and 1.23 \(\times\) 10\({}^{3}\) TBq for the \({}^{60}\)Co and \({}^{90}\)Y production, respectively. The rare-earth radioactive \({}^{155}\)Sm and \({}^{177}\)Lu isotopes are expensive and their world production is very limited. The results of these isotopes' production in the irradiation unit are shown in Figure 10. In both cases, the campaign is 10 calendar days of pulse irradiation. The maximum accumulation of \({}^{155}\)Sm and \({}^{177}\)Lu in the rods is below the reference values; assuming the accepted criterion of 10% of the reference activity, some generation of these isotopes is, nevertheless, still possible. In case of \({}^{153}\)Sm, the commercial yield could be expected in the rods within the first 0-25 cm, and in the case of \({}^{177}\)Lu, it is produced with 0-35 cm.