Input interpretation
U-236 (uranium-236) | Pa-227 (protactinium-227) | Bi-209 (bismuth-209)
Natural abundance
U-236 | Pa-227 | Bi-209 0% | 0% | 100%
Decay properties
| U-236 | Pa-227 | Bi-209 half-life | 23.42 Myr (-280 to 310 Myr) | 38 min (37.97 to 38.63 min) | 1.9×10^19 yr mean lifetime | 33.79 Myr (-500 to 600 Myr) | 55.33 min (54.77 to 55.73 min) | 2.74×10^19 yr decay constant | 9.385×10^-16 per second | 3.012×10^-4 per second | 1.16×10^-27 per second specific activity | 2.394 MBq/g | 799000 TBq/g | 3.34×10^-6 Bq/g width | 4.281×10^-31 eV | 1.99×10^-19 eV | 0 eV decay modes | α (alpha emission) | SF (spontaneous fission) | α (alpha emission) | ϵ (electron capture) | α (alpha emission) 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%) | Tl-205 (100%)
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
Bi-209
decay mode | α (alpha emission) branching ratio | 100% Q-value | 3.13721 MeV (megaelectronvolts) daughter nuclide | Tl-205
Radiation shielding
| U-236 | Pa-227 lead | 13.4 µm | 8.61 µm water | 32.9 µm | 19.4 µm air | 30 mm | 17.6 mm
Decay chain
U-236
Decay chain U-236
Pa-227
Decay chain Pa-227
Bi-209
Decay chain Bi-209
Mass properties
| atomic number (Z) | mass number (A) | neutron number U-236 | 92 | 236 | 144 Pa-227 | 91 | 227 | 136 Bi-209 | 83 | 209 | 126 | atomic mass | mass excess | binding energy per nucleon U-236 | 236.045568006 u (unified atomic mass units) | 42.446325 MeV (megaelectronvolts) | 7.586477 MeV (megaelectronvolts) Pa-227 | 227.028805072 u (unified atomic mass units) | 26.831753 MeV (megaelectronvolts) | 7.639488 MeV (megaelectronvolts) Bi-209 | 208.980398734 u (unified atomic mass units) | -18.258461 MeV (megaelectronvolts) | 7.847985 MeV (megaelectronvolts)
Mass properties