Rb81 is the parent radionuclide for Kr81m

decay process    
electron capture and positron decay
Half Life    
4.58 hours
Principal emmission
511kev and 446kev gammas,  which contribute to the generator shielding requirements. This is the most active of the Rb radionuclides on a fresh generator


Rb81 Energy
Abundance %
Photons 511 62
446 23
12 35




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Last modified: November 29, 2002