  The half-life of the neutron-rich nuclide, {\fesixty} has been in dispute in
recent years. A measurement in 2009 published a value of $(2.62 \pm
0.04)\times10^{6}$ years, almost twice that of the previously accepted value
from 1984 of $(1.49 \pm 0.27)\times10^{6}$ years. This longer half-life was
confirmed in 2015 by a second measurement, resulting in a value of $(2.50 \pm
0.12)\times10^{6}$ years. All three half-life measurements used the grow-in of
the $\gamma$-ray lines in {\nisixty} from the decay of the ground state of
$^{60}\text{Co}$ (t$_{1/2}$=5.27 years) to determine the activity of a sample
with a known number of {\fesixty} atoms. In contrast, the work presented here
measured the {\fesixty} activity directly via the 58.6 keV $\gamma$-ray line
from the short-lived isomeric state of $^{60}\text{Co}$ (t$_{1/2}$=10.5
minutes), thus being independent of any possible contamination from long-lived
$^{60\text{g}}\text{Co}$. A fraction of the material from the 2015 experiment
with a known number of {\fesixty} atoms was used for the activity measurement,
resulting in a half-life value of $(2.72 \pm 0.16)\times10^{6}$ years,
confirming again the longer half-life. In addition, {\fesixty}/{\fe} isotopic
ratios of samples with two different dilutions of this material were measured
with Accelerator Mass Spectrometry (AMS) to determine the number of {\fesixty}
atoms. Combining this with our activity measurement resulted in a half-life
value of $(2.69 \pm 0.28)\times 10^{6}$ years, again agreeing with the longer
half-life.
