Lu was produced in high-specific activity and excellent radionuclidic purity by thermal neutron bombardment of 176 Yb target. Tetramethylene diamine tetramethylenephosphonic acid (TDTMP) was radiolabeled with 177 Lu and the complexation parameters were studied and optimized: 8.4 µg TDTMP, ~243 µCi of 177 Lu activity, pH= 8 and the reaction mixture was kept at room temperature for 30 min. The complex was formed with high yield (>99%) and retained its stability for more than 14 days. The complex structure was predicted and its binding to target enzyme was assessed. A biodistribution study carried out in normal and tumorized Wister rats showed a significant skeletal uptake, the 177 Lu-TDTMP, the results clearly indicated that it has high affinity for bone mineral. Femur and tibia uptakes of the labelled complex were ~ 6.4 % and ~7.1 % at 3 hours post injection compared to ~ 4 % and ~ 4.3 % in case of 177 LuCl 3. Thereafter, the uptakes increased continuously to a maximum of ~ 7.9 % and ~ 8.3 % at 48 hours after injection were noticed.