Input interpretation
![Ac-227 (actinium-227)](../image_source/718f34901a757b67f235571388566f75.png)
Ac-227 (actinium-227)
Decay properties
![half-life | 21.772 years (21.764 to 21.78 yr) mean lifetime | 31.41 years (31.398 to 31.423 yr) decay constant | 1.0095×10^-9 per second specific activity | 2.6779 TBq/g (terabecquerels per gram) width | 4.6055×10^-25 eV (electronvolts) decay modes | β^- (electron emission) | α (alpha emission) final decay products | Pb-207 (100%) | Tl-205 (9×10^-10)](../image_source/14167e1be1bd0ad61373164dfabfbb19.png)
half-life | 21.772 years (21.764 to 21.78 yr) mean lifetime | 31.41 years (31.398 to 31.423 yr) decay constant | 1.0095×10^-9 per second specific activity | 2.6779 TBq/g (terabecquerels per gram) width | 4.6055×10^-25 eV (electronvolts) decay modes | β^- (electron emission) | α (alpha emission) final decay products | Pb-207 (100%) | Tl-205 (9×10^-10)
Decay modes
![decay mode | β^- (electron emission) branching ratio | 98.62% Q-value | 44.765 keV (kiloelectronvolts) daughter nuclide | Th-227 decay mode | α (alpha emission) branching ratio | 1.38% Q-value | 5.04219 MeV (megaelectronvolts) daughter nuclide | Fr-223](../image_source/b9c626a2936aad0dfd1367fbc45f4765.png)
decay mode | β^- (electron emission) branching ratio | 98.62% Q-value | 44.765 keV (kiloelectronvolts) daughter nuclide | Th-227 decay mode | α (alpha emission) branching ratio | 1.38% Q-value | 5.04219 MeV (megaelectronvolts) daughter nuclide | Fr-223
Radiation shielding
![lead | 7.48 µm portland concrete | 19 µm water | 35.6 µm air | 31.7 mm](../image_source/18c6b84d701c287001ee553f9a66fc67.png)
lead | 7.48 µm portland concrete | 19 µm water | 35.6 µm air | 31.7 mm
Decay chain
![Decay chain](../image_source/68f0ad0500055a9d499a3e3db2096b06.png)
Decay chain
Mass properties
![atomic number (Z) | 89 mass number (A) | 227 neutron number | 138 atomic mass | 227.027752127 u (unified atomic mass units) mass excess | 25.850941 MeV (megaelectronvolts) binding energy per nucleon | 7.650701 MeV (megaelectronvolts)](../image_source/7b378eb21568298662fa5c13fa5200d4.png)
atomic number (Z) | 89 mass number (A) | 227 neutron number | 138 atomic mass | 227.027752127 u (unified atomic mass units) mass excess | 25.850941 MeV (megaelectronvolts) binding energy per nucleon | 7.650701 MeV (megaelectronvolts)
![Mass properties](../image_source/241d477ff725095c3d4697facee6fc56.png)
Mass properties
Nearby isotopes
![Nearby isotopes](../image_source/107e2881a599ab71aba1edb43345a6f8.png)
Nearby isotopes
Quantum properties
![spin parity J^π | 3/2^- (atomic boson) magnetic moment | 1.1 μ_N electric quadrupole moment | 1.7 eb (electron barns)](../image_source/5e859f62ed1f94e09272560b7c4bb54d.png)
spin parity J^π | 3/2^- (atomic boson) magnetic moment | 1.1 μ_N electric quadrupole moment | 1.7 eb (electron barns)
![Quantum properties](../image_source/fc580d8e09f460bd93bec3acdbaf1b70.png)
Quantum properties
Excitations
![E_level | spin parity J^π | half-life τ_1/2 | width Δ 27.37 keV (kiloelectronvolts) | 3/2^+ | 3.83×10^-8 seconds | 1.19×10^-8 eV (electronvolts) 29.98 keV (kiloelectronvolts) | 5/2^- | (unknown) | (unknown) 46.35 keV (kiloelectronvolts) | 5/2^+ | (unknown) | (unknown) 74.14 keV (kiloelectronvolts) | 7/2^- | (unknown) | (unknown) 84.55 keV (kiloelectronvolts) | 7/2^+ | (unknown) | (unknown) 109.94 keV (kiloelectronvolts) | 9/2^+ | (unknown) | (unknown) 126.86 keV (kiloelectronvolts) | 9/2^- | (unknown) | (unknown) 148 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 160 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 187.32 keV (kiloelectronvolts) | 11/2^+ | (unknown) | (unknown)](../image_source/ab36b8708013fc801d2e9eb4aedbf2ec.png)
E_level | spin parity J^π | half-life τ_1/2 | width Δ 27.37 keV (kiloelectronvolts) | 3/2^+ | 3.83×10^-8 seconds | 1.19×10^-8 eV (electronvolts) 29.98 keV (kiloelectronvolts) | 5/2^- | (unknown) | (unknown) 46.35 keV (kiloelectronvolts) | 5/2^+ | (unknown) | (unknown) 74.14 keV (kiloelectronvolts) | 7/2^- | (unknown) | (unknown) 84.55 keV (kiloelectronvolts) | 7/2^+ | (unknown) | (unknown) 109.94 keV (kiloelectronvolts) | 9/2^+ | (unknown) | (unknown) 126.86 keV (kiloelectronvolts) | 9/2^- | (unknown) | (unknown) 148 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 160 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 187.32 keV (kiloelectronvolts) | 11/2^+ | (unknown) | (unknown)