Strontium chloride [89Sr] injection is used for the treatment of tumor bone metastasis, and has the characteristics of targeting, long-term effectiveness, and safety.

　　Strontium [89Sr] has a half-life of 50.5 days and emits pure beta rays with a maximum energy of 1.46 MeV. Its biochemical properties are similar to calcium, and it is an osteophilic nuclide. The uptake of strontium [89Sr] by bone metastases is 2-25 times that of normal bone tissue. The biological effects of radiation can be used to relieve pain, inhibit and kill tumor cells, and achieve effective treatment.