Input interpretation
Gd-161 (gadolinium-161)
Decay properties
half-life | 220 seconds (211 to 229 s) mean lifetime | 5.28 minutes (5 to 5.5 min) decay constant | 0.00316 per second specific activity | 1.18×10^7 TBq/g (terabecquerels per gram) width | 1.44×10^-18 eV (electronvolts) decay modes | β^- (electron emission) final decay products | Dy-161 (100%)
Decay mode
decay mode | β^- (electron emission) Q-value | 1.95548 MeV (megaelectronvolts) daughter nuclide | Tb-161
Radiation shielding
lead | 1.41 mm portland concrete | 4.87 mm water | 9.54 mm air | 8.3 m
Decay chain
Decay chain
Mass properties
atomic number (Z) | 64 mass number (A) | 161 neutron number | 97 atomic mass | 160.929669211 u (unified atomic mass units) mass excess | -65.512709 MeV (megaelectronvolts) binding energy per nucleon | 8.167233 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 5/2^- (atomic fermion)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 71.9 keV (kiloelectronvolts) | 7/2^- | (unknown) | (unknown) 163.7 keV (kiloelectronvolts) | 9/2^- | (unknown) | (unknown) 276 keV (kiloelectronvolts) | 11/2^- | (unknown) | (unknown) 314.3 keV (kiloelectronvolts) | 3/2^- | (unknown) | (unknown) 355 keV (kiloelectronvolts) | 1/2^- | (unknown) | (unknown) 394.7 keV (kiloelectronvolts) | 3/2^- | (unknown) | (unknown) 438 keV (kiloelectronvolts) | 7/2^- | (unknown) | (unknown) 438 keV (kiloelectronvolts) | 5/2^- | (unknown) | (unknown) 510 keV (kiloelectronvolts) | 9/2^+ | (unknown) | (unknown) 529 keV (kiloelectronvolts) | 7/2^- | (unknown) | (unknown)