Background and Objective: Skeletal uptake of 90Y-1,4,7,10-tetraazacyclododecane-1,4,7,10-
tetramethylene-phosphonate (DOTMP) is used to deliver high doses of this radiopharmaceutical to the
Methods: In this research, carrier-free (c.f.) 90Y was obtained from an electrochemical 90Sr/90Y generator.
The c.f. 90Y was mixed with 300 µL of DOTMP (20 mg/mL) and incubated under stirring conditions
at room temperature for 45 min.
Results: The [90Y]Y-DOTMP that was obtained under optimized reaction conditions had high radiochemical
purities (>98%). Moreover, the radiolabeled complex exhibited excellent stability at room
temperature, as well as in human serum. The biodistribution studies in rats showed the favorable selective
skeletal uptake with rapid clearance from the blood, albeit with insignificant accumulation of activity
in other non-target organs for the radiolabeled complex. Also, the present work has utilized the
Monte Carlo codes MCNP-4C to simulate the depth dose profile for 90Y in a mice femur bone and compared
with that produced by 153Sm and 177Lu.
Conclusion: The results show that the absorbed dose produced by 90Y in the bone marrow is higher than
153Sm and 177Lu per 1MBq of the injected activity.