这个词是什么意思？
A radioactive element of the alkaline earth series of metals. It has the atomic symbol Ra and atomic number 88. Radium is the product of the disintegration of URANIUM and is present in pitchblende and all ores containing uranium. It is used clinically as a source of beta and gamma-rays in radiotherapy, particularly BRACHYTHERAPY.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D011883 · MeSH 2026。
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