Medical radionuclide / Radionuclides Y-88, Zr-89, Zr-88 / Excitation function / Cross section / Integral yield Summary. Excitation functions of the reactions 89 Y( p, n) 89 Zr, 89 Y( p, 2n) 88 Zr and 89 Y( p, pn) 88 Y were measured from their respective thresholds up to 17.7 MeV, with particular emphasis on data for the production of the medically important radionuclide 89 Zr. The conventional stacked-foil technique was used, and the samples for irradiation were prepared by the sedimentation process. The excitation functions obtained were compared with those calculated theoretically using the ALICE-IPPE code. The measured data were also compared with the available literature values. From the experimental data the theoretical yields of the investigated radionuclides were calculated as a function of proton energy. The excitation function for the 89 Y( p, n) 89 Zr reaction measured in the proton energy range 5.1 to 17.7 MeV shows a pronounced broad peak in the energy range 16 → 11 MeV. On the other hand and because of the high threshold energy of the two other reactions 89 Y( p, 2n) 88 Zr and 89 Y( p, pn) 88 Y, their excitation functions were measured only in the proton energy range 14.3 to 17.7 MeV. Differential and integral yields for the production of the three radionuclides were calculated. It was found that the suitable energy range for the production of 89 Zr is 14 → 9 MeV; over this energy range the 89 Zr amounts to 58 MBq/µA h. In the proton energy range provided by MGC-20 cyclotron [E p (max) = 18 MeV], only 89 Zr can be produced in a suitable activity and with a high purity. Production of 88 Zr and 88 Y needs proton energy higher than that provided by this type of cyclotron.

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A novel anion-exchange chromatographic method for separation of radioiodine from an antimony target irradiated with 3 He-or a-particles was developed, with separation yield of radioiodine amounting to 90 ± 5 % and its decontamination factor from the Te and Sb radionuclides to *10 4 . The optimized separation method developed was then applied to the production of 124 I via the 121 Sb(a,n) 124 I process using a highly enriched 121 Sb target. Quality control tests showed that the separated 124 I occurred [99 % as iodide and the longer lived impurities 126 I and 125 I amounted to 0.16 % and \0.05 %, respectively. The trace level of inactive Sb impurity was determined by ICP-OES.

Reaction cross section / Excitation function / nat Te target / Radioisotopes of iodineSummary. The excitation functions of proton induced nuclear reactions on nat Te were measured using the stackedfoil technique up to 14.5 MeV. Samples of thin uniform layers of nat Te on Ti-backing were prepared by electrodeposition. Nuclear reaction cross sections for the formation of 120g,121,123,124,125,126,128,130(m+g) I were determined and their theoretical thick target yields were calculated. The obtained data were compared with the previously published experimental results and the values obtained theoretically using the ALICE-IPPE computer code.