Input interpretation
Ac-224 | daughter nuclides
Result
Ra-224 | Fr-220 | Th-224
Decay properties
| Ra-224 | Fr-220 | Th-224 half-life | 87.166 h (87.1 to 87.24 h) | 27.4 s (27.07 to 27.73 s) | 810 ms (700 to 920 ms) mean lifetime | 125.75 h (125.65 to 125.86 h) | 39.5 s (39.06 to 40 s) | 1.17 s (1 to 1.34 s) decay constant | 2.2089×10^-6 per second | 0.0253 per second | 0.856 per second specific activity | 5938 TBq/g | 6.93×10^7 TBq/g | 2.3×10^9 TBq/g width | 1.0077×10^-21 eV | 1.67×10^-17 eV | 3.9×10^-16 eV decay modes | α (alpha emission) | ^14C (cluster emission) | α (alpha emission) | β^- (electron emission) | α (alpha emission) | 2β^+ (double beta decay) final decay products | Pb-208 (100%) | Pb-206 (4×10^-11) | Pb-208 (100%) | Pb-208 (100%) | Pb-206 (0)
Decay modes
decay mode | β^+ (positron emission) branching ratio | 90.6% Q-value | 385.33 keV (kiloelectronvolts) daughter nuclide | Ra-224 decay mode | α (alpha emission) branching ratio | 9.4% Q-value | 6.3269 MeV (megaelectronvolts) daughter nuclide | Fr-220 decay mode | β^- (electron emission) branching ratio | 1.6% Q-value | 238.4 keV (kiloelectronvolts) daughter nuclide | Th-224
Ra-224
decay mode | α (alpha emission) branching ratio | 100% Q-value | 5.78885 MeV (megaelectronvolts) daughter nuclide | Rn-220 decay mode | ^14C (cluster emission) branching ratio | 4×10^-11 daughter nuclide | Pb-210
Fr-220
decay mode | α (alpha emission) branching ratio | 100% Q-value | 6.80074 MeV (megaelectronvolts) daughter nuclide | At-216 decay mode | β^- (electron emission) branching ratio | 0.35% Q-value | 1.21003 MeV (megaelectronvolts) daughter nuclide | Ra-220
Th-224
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
| Ra-224 | Fr-220 | Th-224 lead | 18.1 µm | 22.4 µm | 24.6 µm water | 47 µm | 60.5 µm | 67.7 µm air | 42.8 mm | 55.1 mm | 61.6 mm
Decay chain
Ra-224
Decay chain Ra-224
Fr-220
Decay chain Fr-220
Th-224
Decay chain Th-224
Mass properties
| atomic number (Z) | mass number (A) | neutron number Ra-224 | 88 | 224 | 136 Fr-220 | 87 | 220 | 133 Th-224 | 90 | 224 | 134 | atomic mass | mass excess | binding energy per nucleon Ra-224 | 224.020211821 u (unified atomic mass units) | 18.82719 MeV (megaelectronvolts) | 7.679917 MeV (megaelectronvolts) Fr-220 | 220.012327405 u (unified atomic mass units) | 11.482904 MeV (megaelectronvolts) | 7.70974 MeV (megaelectronvolts) Th-224 | 224.021466895 u (unified atomic mass units) | 19.996285 MeV (megaelectronvolts) | 7.667712 MeV (megaelectronvolts)
Mass properties