<prompt> Which isotope is used for treating bone cancer?SrGa1123Tc  <response>: ANSWER: A SrREF: Perez and Bradys Principles and Practice of Radiation Oncology 5th ed Page 1997See APPENDIX-67 below for ISOTOPES USED IN RADIOTHERAPYA medical isotope of strontium is Sr-89, which is used for pain relief in certain bone cancers. Strontium 89 is a pure b emitter with half life of 50.6 daysStrontium-90 is used medically as the radioactive source in arterial stents in patients with blocked arteries to help maintain blood flow.Strontium-90 is also the primary source of its decay daughter-product yttrium-90, which has many applications as a radiopharmaceutical in cancer treatment.The first radiopharmaceutical used for treatment of bone metastases was phosphorous-32 subjective pain relief but with unacceptable bone marrow toxicityTechnetium-9 9m is used in bone scans to detect and locate bone cancer APPENDIX - 67Isotopes Used in RadiotherapyIsotopeHalf LifeUsesTechnetium 996 hoursBone scanCobalt 60 Artificial5.27 yearsTeletherapy BrachytherapyIodine 12313 hoursRadioactive iodine uptakeIodine 12560 daysBrachytherapy PIodine 1318 daysRadiotherapyIodine 1322.3 hours min Radium1622 years maxNot used now a daysAu 198 gold2.7 daysBrachytherapy PPd 103 palladium17 daysBrachytherapy PCesium 1319.7 daysBrachytherapy PCesium 13730 yearsTeletherapy 81 Brachytherapy TIridium 192 Artificial74 daysBrachytherapy TStrontium 9029 yearsBrachytherapy TRadon 2223.8 daysBrachytherapy TBrachytherapy can be of two types, permanent implant P or temporary implant T 