High‐precision measurements of half‐lives for ¹⁹⁶Au, ⁹⁹Mo, ¹²²Sb, ⁷⁹Kr, ⁷⁷Kr, ⁸⁹Zr, ⁸⁵Sr, and ⁷⁷Br radionuclides via photoactivation at the Madison Accelerator Laboratory.

The ground state half-lives of ¹⁹⁶Au, ⁹⁹Mo, ¹²²Sb, ⁷⁹Kr, ⁷⁷Kr, ⁸⁹Zr, ⁸⁵Sr, and ⁷⁷Br have been measured with high precision using the photoactivation analysis technique at an unconventional bremsstrahlung facility at the Madison Accelerator Laboratory that features a repurposed medical electron linear accelerator. The γ-ray activity was counted over about 5 half-lives with a high-purity germanium detector, enclosed into an ultra low-background lead shield. The preliminary measured half-lives are: T_1/2(¹⁹⁶Au)=6.14 ± 0.01 (stat) d; T_1/2(⁹⁹Mo)=65.87 ± 0.03 (stat) h; T_1/2(¹²²Sb)=2.69 ± 0.01 (stat) d; T_1/2(⁷⁹Kr)=32.79 ± 0.07 (stat) h; T_1/2(⁷⁷Kr)=71.51 ± 1.59 (stat) min; T_1/2(⁸⁹Zr)=86.19 ± 2.24 (stat) h; T_1/2(⁸⁵Sr)=66.27 ± 0.51 (stat) d; T_1/2(⁷⁷Br)=56.75 ± 9.69 (stat) h.