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Related to actinon: radium emanation
actinium emanationA radioisotope associated with actinium identified in 1904, which has a half-life of 3.96 seconds and correspond to 219Rn.
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actinon(ak′tĭ-non″) [ actinium]
A chemically inert, short-lived isotope of actinium.
Medical Dictionary, © 2009 Farlex and Partners