Gamma radiation from the decay of the95Tc ground state and from the93Tc isomeric pair

High precision half-life measurement of $$^{95}\hbox {Ru}$$, $$^{95}\hbox {Tc}$$ and $$^{95m}\hbox {Tc}$$ with $$\gamma $$-spectroscopy

“…1 The number of 95 Ru isotopes produced in the 92 Mo(α,n) 95 Ru reaction as a function of time after the activation calculated from the 336.40 keV peak area using the literature half-life (t 1/2 = 1.643 ± 0.013 h). The slope of the data indicates that the half-life value may be overestimated carried out almost 50 years ago using a NaI(Tl) detector [14]. In table 1 of [14] the γ -transitions assigned to the β-decay of 95 Tc are listed, however, according to [6,7] some of the transitions belong also to the decay of the metastable state of 95 Tc ( 95m Tc) or γ -transitions emitted during the β-decay of the metastable state can be found close to listed peaks (within the resolution of the detector).…”

“…Furthermore, the cross section of the investigated reaction can also be derived by measuring the activity of the daughter isotope of the reaction product. However, the adopted half-life value of 95 Tc is based on only one measurement [7,10] 1 carried out almost 50 years ago using a NaI(Tl) detector [14]. In table 1 of [14] the γ-transitions assigned to the β-decay of 95 Tc are listed, however, according to [6,7] some of the transitions belong also to the decay of the metastable state of 95 Tc ( 95m Tc) or γ-transitions emitted during the β-decay of the metastable state can be found close to listed peaks (within the resolution of the detector).…”

“…However, the adopted half-life value of 95 Tc is based on only one measurement [7,10] 1 carried out almost 50 years ago using a NaI(Tl) detector [14]. In table 1 of [14] the γ-transitions assigned to the β-decay of 95 Tc are listed, however, according to [6,7] some of the transitions belong also to the decay of the metastable state of 95 Tc ( 95m Tc) or γ-transitions emitted during the β-decay of the metastable state can be found close to listed peaks (within the resolution of the detector). Accordingly, the derived results may overestimate the ground state half-life of 95 Tc.…”