  The half-life of 66Ga, an isotope very important for high-energy efficiency
calibration of gamma-detectors, has been measured using gamma-spectroscopy. In
order to reduce systematic uncertainties, different source production methods
and gamma-counting conditions have been applied. A half-life value of 9.312 +-
0.032 h has been obtained in agreement with a recent measurement but in
contradiction with some of the earlier results.
