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Strontium Sr-89
Definition 1
A radioisotope of strontium, a heavy metal found naturally as a non-radioactive element. With a half-life of 50 days, strontium-89 is a beta emitter that is metabolized much like calcium. This agent is preferentially absorbed by osteoblastic bone metastases. (NCI Thesaurus)
Definition 2
A radioactive form of the metal strontium that is taken up by a part of growing bone. It is being studied in the treatment of bone pain caused by some types of cancer. (NCI Dictionary)
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