Half-life measurement of 95mTc--refinement in the uncertainty value.

Measurements at Isotope Products Laboratories (IPL) carried out with a hyper-pure germanium (HPGe) spectrometer have sought to improve upon the accepted half-life value for 95mTc. The uncertainty associated with the currently accepted value of (61+/-2) days allows for potentially significant improvement. Through a series of 65 measurements over the course of nearly 2 years, using multiple source-to-detector counting distances and multiple reference photopeaks, the authors have determined a half-life that agrees with the current value while reducing the uncertainty of the value by 25-fold.