Input interpretation
Ac-209 (actinium-209) | Re-180 (rhenium-180)
Decay properties
| Ac-209 | Re-180 half-life | 100 ms (0 to 200 ms) | 146 s (137 to 156 s) mean lifetime | 144 ms (-8 to 290 ms) | 211 s (196 to 227 s) decay constant | 6.93 per second | 0.00473 per second specific activity | 2×10^10 TBq/g | 1.58×10^7 TBq/g width | 3.16×10^-15 eV | 2.16×10^-18 eV decay modes | α (alpha emission) | β^+ (positron emission) | β^+ (positron emission) final decay products | Au-197 (70%) | Hg-201 (29%) | Tl-205 (1%) | Ir-193 (7×10^-7) | Os-189 (7×10^-14) | W-180 (100%) | Hf-176 (0) | Hf-180 (0)
Decay modes
Ac-209
decay mode | α (alpha emission) branching ratio | 99% Q-value | 7.7292 MeV (megaelectronvolts) daughter nuclide | Fr-205 decay mode | β^+ (positron emission) branching ratio | 1% Q-value | 5.9673 MeV (megaelectronvolts) daughter nuclide | Ra-209
Re-180
decay mode | β^+ (positron emission) branching ratio | 100% Q-value | 2.7826 MeV (megaelectronvolts) daughter nuclide | W-180
Radiation shielding
Radiation shielding
Decay chain
Ac-209
Decay chain Ac-209
Re-180
Decay chain Re-180
Mass properties
| Ac-209 | Re-180 atomic number (Z) | 89 | 75 mass number (A) | 209 | 180 neutron number | 120 | 105 atomic mass | 209.009494863 u (unified atomic mass units) | 179.950789084 u (unified atomic mass units) mass excess | 8.844409 MeV (megaelectronvolts) | -45.839673 MeV (megaelectronvolts) binding energy per nucleon | 7.695847 MeV (megaelectronvolts) | 8.000004 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Ac-209 | Re-180 spin parity J^π | 9/2^- (atomic boson) | 1^- (atomic fermion)
Quantum properties