Kr81 is formed from the isomeric decay of Kr81m, and is also weakly radioactive

decay process    
electron capture
Half Life    
210,000 years
Principal emmission
low energy gammas. Although produced from Kr81m, the long half-life means that there is very low levels of activity.


Kr81 Energy
Abundance %
Photons 12 44
13 7
276 2


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Last modified: November 29, 2002