Input interpretation
![Na-31 (sodium-31) | Ba-149 (barium-149)](../image_source/58999db6257ec846f908d0830f68f4b8.png)
Na-31 (sodium-31) | Ba-149 (barium-149)
Decay properties
![| Na-31 | Ba-149 half-life | 17 ms (16.4 to 17.6 ms) | 344 ms (336.4 to 351.6 ms) mean lifetime | 25 ms (23.8 to 25.3 ms) | 496 ms (485.8 to 506.7 ms) decay constant | 40 per second | 2.02 per second specific activity | 7.8×10^11 TBq/g | 8.15×10^9 TBq/g width | 2.7×10^-14 eV | 1.33×10^-15 eV decay modes | β^- (electron emission) | β^-n (electron + delayed neutron) | β^-2n (electron + delayed 2 neutrons) | β^-3n (electron + delayed 3 neutrons) | β^- (electron emission) | β^-n (electron + delayed neutron) final decay products | P-31 (60%) | Si-30 (42%) | Si-29 (0.9%) | Si-28 (0.05%) | Sm-149 (100%) | Nd-148 (1.8%) | Nd-143 (6×10^-4%) | Ce-140 (0%) | Nd-145 (0%)](../image_source/5f70d4598e702e717207784372c1b661.png)
| Na-31 | Ba-149 half-life | 17 ms (16.4 to 17.6 ms) | 344 ms (336.4 to 351.6 ms) mean lifetime | 25 ms (23.8 to 25.3 ms) | 496 ms (485.8 to 506.7 ms) decay constant | 40 per second | 2.02 per second specific activity | 7.8×10^11 TBq/g | 8.15×10^9 TBq/g width | 2.7×10^-14 eV | 1.33×10^-15 eV decay modes | β^- (electron emission) | β^-n (electron + delayed neutron) | β^-2n (electron + delayed 2 neutrons) | β^-3n (electron + delayed 3 neutrons) | β^- (electron emission) | β^-n (electron + delayed neutron) final decay products | P-31 (60%) | Si-30 (42%) | Si-29 (0.9%) | Si-28 (0.05%) | Sm-149 (100%) | Nd-148 (1.8%) | Nd-143 (6×10^-4%) | Ce-140 (0%) | Nd-145 (0%)
Decay modes
Na-31
![decay mode | β^- (electron emission) branching ratio | 62% Q-value | 15.872 MeV (megaelectronvolts) daughter nuclide | Mg-31 decay mode | β^-n (electron + delayed neutron) branching ratio | 37% Q-value | 13.494 MeV (megaelectronvolts) daughter nuclide | Mg-30 decay mode | β^-2n (electron + delayed 2 neutrons) branching ratio | 0.9% Q-value | 7.131 MeV (megaelectronvolts) daughter nuclide | Mg-29 decay mode | β^-3n (electron + delayed 3 neutrons) branching ratio | 0.05% daughter nuclide | Mg-28](../image_source/627145c33f49b7dd86110a218d770916.png)
decay mode | β^- (electron emission) branching ratio | 62% Q-value | 15.872 MeV (megaelectronvolts) daughter nuclide | Mg-31 decay mode | β^-n (electron + delayed neutron) branching ratio | 37% Q-value | 13.494 MeV (megaelectronvolts) daughter nuclide | Mg-30 decay mode | β^-2n (electron + delayed 2 neutrons) branching ratio | 0.9% Q-value | 7.131 MeV (megaelectronvolts) daughter nuclide | Mg-29 decay mode | β^-3n (electron + delayed 3 neutrons) branching ratio | 0.05% daughter nuclide | Mg-28
Ba-149
![decay mode | β^- (electron emission) branching ratio | 100% Q-value | 7.309 MeV (megaelectronvolts) daughter nuclide | La-149 decay mode | β^-n (electron + delayed neutron) branching ratio | 0.43% Q-value | 1.571 MeV (megaelectronvolts) daughter nuclide | La-148](../image_source/3c8b5a4968bf21af008ce523bd791d37.png)
decay mode | β^- (electron emission) branching ratio | 100% Q-value | 7.309 MeV (megaelectronvolts) daughter nuclide | La-149 decay mode | β^-n (electron + delayed neutron) branching ratio | 0.43% Q-value | 1.571 MeV (megaelectronvolts) daughter nuclide | La-148
Radiation shielding
![| Na-31 lead | 4.34 mm portland concrete | 18.3 mm water | 37 mm air | 30.7 m](../image_source/26a9c6687fad6b356ab1b351085fd3cf.png)
| Na-31 lead | 4.34 mm portland concrete | 18.3 mm water | 37 mm air | 30.7 m
Decay chain
Na-31
![Decay chain Na-31](../image_source/59de47e500a8aaf3baca337f51a5fa13.png)
Decay chain Na-31
Ba-149
![Decay chain Ba-149](../image_source/de1562883977af25b4e3cb2b083e369f.png)
Decay chain Ba-149
Mass properties
![| Na-31 | Ba-149 atomic number (Z) | 11 | 56 mass number (A) | 31 | 149 neutron number | 20 | 93 atomic mass | 31.013585452 u (unified atomic mass units) | 148.94258 u (unified atomic mass units) mass excess | 12.654768 MeV (megaelectronvolts) | -53.486 MeV (megaelectronvolts) binding energy per nucleon | 7.385492 MeV (megaelectronvolts) | 8.136 MeV (megaelectronvolts)](../image_source/331321f34897c02dbb70541b7aab38bc.png)
| Na-31 | Ba-149 atomic number (Z) | 11 | 56 mass number (A) | 31 | 149 neutron number | 20 | 93 atomic mass | 31.013585452 u (unified atomic mass units) | 148.94258 u (unified atomic mass units) mass excess | 12.654768 MeV (megaelectronvolts) | -53.486 MeV (megaelectronvolts) binding energy per nucleon | 7.385492 MeV (megaelectronvolts) | 8.136 MeV (megaelectronvolts)
![Mass properties](../image_source/0c8ad7f71a8cca1d4116d0e17f0f9537.png)
Mass properties
Nearby isotopes
![Nearby isotopes](../image_source/469256e5a4428a4dc7f16cc26ed1d68e.png)
Nearby isotopes
Quantum properties
![| Na-31 | Ba-149 spin parity J^π | 3/2^+ (atomic boson) | 3/2^- (atomic fermion) magnetic moment | 2.305 μ_N | (unknown)](../image_source/7bd110636326963ac3ccf4a4f5bc0744.png)
| Na-31 | Ba-149 spin parity J^π | 3/2^+ (atomic boson) | 3/2^- (atomic fermion) magnetic moment | 2.305 μ_N | (unknown)
![Quantum properties](../image_source/9dc5fce89191097cf9137fec3c183b41.png)
Quantum properties