Input interpretation
Th-224 (thorium-224)
Decay properties
half-life | 810 ms (milliseconds) (700 to 920 ms) mean lifetime | 1.17 seconds (1 to 1.34 s) decay constant | 0.856 per second specific activity | 2.3×10^9 TBq/g (terabecquerels per gram) width | 3.9×10^-16 eV (electronvolts) decay modes | α (alpha emission) | 2β^+ (double beta decay) final decay products | Pb-208 (100%) | Pb-206 (0)
Decay modes
decay mode | α (alpha emission) branching ratio | 100% Q-value | 7.2985 MeV (megaelectronvolts) daughter nuclide | Ra-220 decay mode | 2β^+ (double beta decay) Q-value | -875.3 keV (kiloelectronvolts) daughter nuclide | Ra-224
Radiation shielding
lead | 24.6 µm water | 67.7 µm air | 61.6 mm
Decay chain
Decay chain
Mass properties
atomic number (Z) | 90 mass number (A) | 224 neutron number | 134 atomic mass | 224.021466895 u (unified atomic mass units) mass excess | 19.996285 MeV (megaelectronvolts) binding energy per nucleon | 7.667712 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 0^+ (atomic boson) magnetic moment | 0 μ_N
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 98.1 keV (kiloelectronvolts) | 2^+ | 5.9×10^-10 seconds | 7.7×10^-7 eV (electronvolts) 251 keV (kiloelectronvolts) | 1^- | (unknown) | (unknown) 284.1 keV (kiloelectronvolts) | 4^+ | (unknown) | (unknown) 305.3 keV (kiloelectronvolts) | 3^- | (unknown) | (unknown) 464.5 keV (kiloelectronvolts) | 5^- | (unknown) | (unknown) 534.7 keV (kiloelectronvolts) | 6^+ | (unknown) | (unknown) 699.5 keV (kiloelectronvolts) | 7^- | (unknown) | (unknown) 833.9 keV (kiloelectronvolts) | 8^+ | (unknown) | (unknown) 997.7 keV (kiloelectronvolts) | 9^- | (unknown) | (unknown) 1173.8 keV (kiloelectronvolts) | 10^+ | (unknown) | (unknown)