Assessment of the Body Radioactivity of I-131 Using Two Techniques

Iodine-131 has become an essential radionuclide used in nuclear medicine for clinical and research purposes. The increase use of this diagnostic treatment thyroid diseases creates a demand to obtain feasible methodology occupational or accidental monitoring internal contamination. In study, two techniques were employed find appropriate one vivo bioassay evaluating body content. A scanning Whole Body Counter (WBC) equipped with 6NaI (Tl) scintillation detector, anthropomorphic phantom point source used. results showed that the counter sensitivity, as first approach (conventional method), had logarithmic significant correlation neck weight. On other hand, counting rate Compton band was considered, which is measure gamma ray attenuation, found have direct relationship new technique, considered variation sensitivity photopeak ratio, same regression but less uncertainty than conventional approach. Finally, theoretical MDA weight calculated all configurations.