Determination of 129I in 131I-pharmaceuticals produced in THOR

Abstract 131 I is one of the most important radionuclides used in nuclear medicine. The accompanying isotope 129 I with insignificant activities in 131 I-pharmaceuticals, produced in THOR, were determined in terms of 129 I/ 131 I ratio by neutron activation analysis. The detection limit of 129 I can be lowered to order of 0.1 Bq, superior to conventional radiometric methods. The 129 I/ 131 I ratios in the 131 I-pharmaceuticals, were measured to be in the range from 3.9 to 8.3.