Input interpretation
U-236 (uranium-236) | Pa-227 (protactinium-227)
Decay properties
| U-236 | Pa-227 half-life | 23.42 Myr (-280 to 310 Myr) | 38 min (37.97 to 38.63 min) mean lifetime | 33.79 Myr (-500 to 600 Myr) | 55.33 min (54.77 to 55.73 min) decay constant | 9.385×10^-16 per second | 3.012×10^-4 per second specific activity | 2.394 MBq/g | 799000 TBq/g width | 4.281×10^-31 eV | 1.99×10^-19 eV decay modes | α (alpha emission) | SF (spontaneous fission) | α (alpha emission) | ϵ (electron capture) final decay products | Pb-208 (100%) | Pb-206 (4×10^-9%) | Pb-204 (0%) | Hg-200 (0%) | Hg-204 (0%) | Pb-207 (100%) | Tl-205 (1.4×10^-8%)
Decay modes
U-236
decay mode | α (alpha emission) branching ratio | 100% Q-value | 4.5731 MeV (megaelectronvolts) daughter nuclide | Th-232 decay mode | SF (spontaneous fission) branching ratio | 9.6×10^-8%
Pa-227
decay mode | α (alpha emission) branching ratio | 85% Q-value | 6.5804 MeV (megaelectronvolts) daughter nuclide | Ac-223 decay mode | ϵ (electron capture) branching ratio | 15% Q-value | 1.02558 MeV (megaelectronvolts) daughter nuclide | Th-227
Radiation shielding
| U-236 lead | 13.4 µm water | 32.9 µm air | 30 mm
Decay chain
U-236
Decay chain U-236
Pa-227
Decay chain Pa-227
Mass properties
| U-236 | Pa-227 atomic number (Z) | 92 | 91 mass number (A) | 236 | 227 neutron number | 144 | 136 atomic mass | 236.045568006 u (unified atomic mass units) | 227.028805072 u (unified atomic mass units) mass excess | 42.446325 MeV (megaelectronvolts) | 26.831753 MeV (megaelectronvolts) binding energy per nucleon | 7.586477 MeV (megaelectronvolts) | 7.639488 MeV (megaelectronvolts)
Mass properties