Strontium-89

Definition of strontium chloride Sr 89
National Cancer Institute

strontium chloride Sr 89

(STRON-shee-um KLOR-ide …)
A salt form of the radioactive metal strontium-89 that is absorbed by a part of growing bone. It is being studied in the treatment of bone pain caused by cancer that has spread to the bone. Strontium Sr 89 is the active ingredient of strontium chloride Sr 89.

Source: NCI Dictionary of Cancer Terms