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We have produced  90m Nb and  99m Tc in the reactions of  nat Zr( p,xn ) 90m Nb and  100 Mo( γ,n ) 99 Mo, followed by disintegration to  99m Tc, respectively, and measured the half-lives of these nuclides by using a reference source method. In order to determine the short half-lives of  90m Nb precisely, an on-line gas-jet system has been employed. As a result, the half-lives of these nuclides were determined with good precision on the order of magnitude of 0.1%.

Precision measurement of the half-life of 90m Nb and 99m Tc