Input interpretation
![Ac-208 (actinium-208)](../image_source/1d60332b629412c9fefbd2bb0bb86f6d.png)
Ac-208 (actinium-208)
Decay properties
![half-life | 95 ms (milliseconds) (70 to 130 ms) mean lifetime | 140 ms (milliseconds) (90 to 190 ms) decay constant | 7.3 per second specific activity | 2.1×10^10 TBq/g (terabecquerels per gram) width | 3.3×10^-15 eV (electronvolts) decay modes | α (alpha emission) | β^+ (positron emission) final decay products | Hg-196 (60%) | Hg-200 (40%) | Pb-204 (5×10^-4) | Pt-192 (6×10^-6) | Pb-208 (4×10^-10) | Os-188 (3×10^-13) | Os-184 (7×10^-20) | Hf-176 (0) | Hf-180 (0) | Pt-196 (0) | W-180 (0) | W-184 (0)](../image_source/df3e4aee07e9a9b24d7d0bc8c9657b4f.png)
half-life | 95 ms (milliseconds) (70 to 130 ms) mean lifetime | 140 ms (milliseconds) (90 to 190 ms) decay constant | 7.3 per second specific activity | 2.1×10^10 TBq/g (terabecquerels per gram) width | 3.3×10^-15 eV (electronvolts) decay modes | α (alpha emission) | β^+ (positron emission) final decay products | Hg-196 (60%) | Hg-200 (40%) | Pb-204 (5×10^-4) | Pt-192 (6×10^-6) | Pb-208 (4×10^-10) | Os-188 (3×10^-13) | Os-184 (7×10^-20) | Hf-176 (0) | Hf-180 (0) | Pt-196 (0) | W-180 (0) | W-184 (0)
Decay modes
![decay mode | α (alpha emission) branching ratio | 99% Q-value | 7.7268 MeV (megaelectronvolts) daughter nuclide | Fr-204 decay mode | β^+ (positron emission) branching ratio | 1% Q-value | 8.0241 MeV (megaelectronvolts) daughter nuclide | Ra-208](../image_source/df6307314917fa189d1d4ff583ec4490.png)
decay mode | α (alpha emission) branching ratio | 99% Q-value | 7.7268 MeV (megaelectronvolts) daughter nuclide | Fr-204 decay mode | β^+ (positron emission) branching ratio | 1% Q-value | 8.0241 MeV (megaelectronvolts) daughter nuclide | Ra-208
Decay chain
![Decay chain](../image_source/4f8afeb8512051c61f2af3e20afd4d7f.png)
Decay chain
Mass properties
![atomic number (Z) | 89 mass number (A) | 208 neutron number | 119 atomic mass | 208.011551551 u (unified atomic mass units) mass excess | 10.760201 MeV (megaelectronvolts) binding energy per nucleon | 7.684831 MeV (megaelectronvolts)](../image_source/d0d6930beba56dbc3a9aafdb8f84431b.png)
atomic number (Z) | 89 mass number (A) | 208 neutron number | 119 atomic mass | 208.011551551 u (unified atomic mass units) mass excess | 10.760201 MeV (megaelectronvolts) binding energy per nucleon | 7.684831 MeV (megaelectronvolts)
![Mass properties](../image_source/be2f6c75a9b861567d3c5b5ee58efc1b.png)
Mass properties
Nearby isotopes
![Nearby isotopes](../image_source/7e63fcaa616c85f100a0f6f4fd7d7d5c.png)
Nearby isotopes
Quantum properties
![spin parity J^π | 3^+ (atomic fermion)](../image_source/d09b574bed7c75af6b6077f53fd33d39.png)
spin parity J^π | 3^+ (atomic fermion)
![Quantum properties](../image_source/00dadcce726f3dfcbbf594b91a1831f3.png)
Quantum properties
Excitations
![E_level | spin parity J^π | half-life τ_1/2 | width Δ 506 keV (kiloelectronvolts) | 10^- | 0.025 seconds | 1.8×10^-14 eV (electronvolts)](../image_source/f6dc6ae8ff313780e0a5e51a53576c35.png)
E_level | spin parity J^π | half-life τ_1/2 | width Δ 506 keV (kiloelectronvolts) | 10^- | 0.025 seconds | 1.8×10^-14 eV (electronvolts)