Element
actinium
ac·tin·i·um [ ak-tin-ee-uhm ]
Subclass of:
Actinoid Series Elements;
Metals, Heavy
Definitions related to actinium:
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(ac) A special purpose domain for the characterization of challenge agents (i.e., the substances administered to cause the diseases or conditions of interest) for those study designs that involve the use of a challenge agent.CDISC TerminologyClinical Data Interchange Standards Consortium (CDISC), 2021
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A trivalent radioactive element and the prototypical member of the actinide family. It has the atomic symbol Ac, and atomic number 89. Its principal isotope is 227 and it decays primarily by beta-emission.NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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(challenge agent characterization domain) A domain utilized for the submission of information encompassing and representing data, vocabulary or records related to challenge agents.NCI ThesaurusU.S. National Cancer Institute, 2021
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