Radiology General bb312ea4 All of the following radioisotopes are used as systemic radionucleide, except – A Phosphorus-32 B Strontium- 89 C Iridium-192 D Samarium-153 High-Yield Explanation Radionuclides used for systemic radiotherapy are 32P, 131I, Strontium - 89, Samarium - 153, Yttrium, and Rhenium.