Abstract
The measurement of the 106Ru content in 99mTc eluates from 99Mo-99mTc generators is difficult because of the proximity of the 103Ru and 106Ru gamma-ray spectral peaks and the low 106Ru content. 106Ru causes a relatively high whole-body dose, similarly as known contaminants 60Co, 134Cs, 140Ba and some others. Assuming that ruthenium is eliminated from the body with the biological half-life 7.3 days (according to ICRP) the additional absorbed dose caused by 106Ru does not exceed, with regard to the low content of this nuclide, the dose due to 103Ru. The results are given of the preliminary experiment in animals with the aim to determine the biological behaviour of ruthenium radioisotopes after the administration of the 99mTc eluate containing these contaminants.
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