Abstract
Excitation functions were measured by the stacked-foil technique for (p, xn) reactions up to E p = 20 MeV on natural tellurium and enriched 123Te. Thick target yields were calculated for the formation of 121I, 123I, 124I, 126I, 128I and 130I from natural tellurium, and 122I and 123I from enriched 123Te. The optimum energy range for the production of 123I via the 123Te(p, n) 123I reaction is E p = 14.5 → 11.0 MeV, and the theoretical thick target yield 4 mCi/μAh. The levels of the three major impurities 124I, 126I and 130I are directly dependent on the 124Te, 126Te and 130Te contents, respectively, in enriched 123Te. The levels of impurities determined experimentally under high-current production conditions agree with those calculated from the cross section data. A comparison of the three direct methods of 123I-production, viz. 124Te(p, 2n) 123I, 123Te(p, n) 123I and 122Te(d, n) 123I, under optimum conditions for each reaction, is given. The yield and impurity-level data suggest that the 123Te(p, n) 123I reaction has a great potential for production in a low-energy cyclotron, if highly enriched 123Te (>91%) is used.
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