Hello docs, is chemotherapy a type of nuclear medicine?

Sometimes: Certain types of therapy for tumors involve radioactive materials. Thyroid cancer and hyperthyroidism treated with radioactive iodine i131.Strontium-89 and (increasingly) samarium 153 used for the relief of cancer-induced bone pain. Internal radionuclide therapy is by planting a small radiation source, usually a gamma or beta emitter.Iridium-192 implants are used especially in the head and breas.

No: No nuclear medicine can be used to treat/eliminate cancer but it uses a completely different mechanism to fight cancer. Most chemo uses chemicals to interrupt the cell cycle to cause cell death. Nuclear medicine uses beta and now Alpha radiation to eliminate the cancer cells.