emanation

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Radium emanation gives off [alpha]-particles, that is, very rapidly moving atoms of helium, and deposits exceedingly minute quantities of a solid, radio-active substance known as radium A. The change of the emanation into helium and radium A proceeds fairly rapidly: the half-life period of the emanation is a little less than four days.

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  1. noun The act or an instance of emanating.
  2. noun Something that issues from a source; an emission.
  3. noun Chemistry Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.

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  1. = French émanation = Spanish emanacion = Portuguese emanação = Italian emanazione; from Late Latin emanatio(n-), an emanation, from Latin emanare, flow out: see emanate.
 

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/ɛməˈneɪʃən/
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