Abstract
Using the TDPAC-technique binding parameters for Hf were determined afterin vivo uptake of181Hf in rat plasma. As much as 98.5% of the metal ions proved to be bound to protein, essentially to transferrin. The main fraction of the181Hf ions experiences a well defined electric quadrupole perturbation frequency (vQ1=(1516 ± 15)MHz, δ1=(5.3 ± 0.8)%) connected with a marked relaxation damping (λ = (46 ± 8)MHz). The remaining Hf nuclei are subject to a fairly broad distribution of electric field gradients (vQ2=(1014 ± 37)MHz, δ2=(16±3)%). The results are compared with data obtained within vitro181Hf-labeled human transferrin.
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