All of the following radioisotopes are used as systemic radionucleide, except –: (A) Phosphorus-32, (B) Strontium- 89, (C) Iridium-192, (D) Samarium-153
Answer is C. Radionuclides used for systemic radiotherapy are 32P, 131I, Strontium - 89, Samarium - 153, Yttrium, and Rhenium.