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Detailed Description

• Ge68 decays into Ga68 (270 days) solely via electron capture.
• Ga68 decays into Zn68 (68 minutes) via both electron capture and beta+ decay
• The Zn68 also has a 1st excited state of 1.07 MeV
• The K/L gammas from electron capture and the conversion electrons will be omitted (too low energy or intensity).
• However the 1.07 MeV gamma ray will need to be taken into Account. The important thing is to get the beta+ to EC ratio correct for the Zn68 ground state and the 1st excited A combination of NNDC ENSDF Decay Search and Nudat databases give the following info G.S. beta+: (87.94%, Q=1899.1 keV), EC (8.70%, gammas omitted) 1st excited states: (1.20%, Q=821.8 keV, Egamma=1077.35 keV), EC(1.79%, Egamma=1077.35 keV) Others cascades that pass the 1st excited states: 3.22-1.79-1.20=0.23%, Egamma=1077.35 keV Note the beta+ and gamma correlation for the 1st excited states

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