Sm-EDTMP is widely used as a palliative radiopharmaceutical for treatment of metastatic bone pain. It is produced by neutron activation of enriched Sm targets in a nuclear reactor. The long-lived europium radionuclides are co-produced along with production of Sm and it give rise to radioactive waste in Sm-EDTMP production. The gamma radiation dose rate was found significant on the radioactive waste generated during the production of Sm-EDTMP. Residual activity in six waste samples generated in different batches of Sm-EDTMP production were analysed for percentage contributions of Eu using gamma-ray spectrometry. Eu was a major contributor with around 62%, and the other radioisotopes, viz. Eu &Eu contribution were ∼29% & ∼9% respectively. The activity concentration of these long-lived europium radionuclides in samarium radiopharmaceutical production waste may be utilised for the dose rate estimation, and vice versa.
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