Input interpretation
Al-21 (aluminum-21) | P-31 (phosphorus-31)
Natural abundance
Al-21 | P-31 0 | 100%
Decay properties
| Al-21 | P-31 half-life | 35 ns (0 to 39 ns) | (stable) mean lifetime | 50 ns (-6.675×10^-299 to 51.4 ns) | (stable) decay constant | 2×10^7 per second | 0 per second specific activity | 5.7×10^17 TBq/g | 0 Bq/g width | 1.3×10^-8 eV | 0 eV decay modes | p (proton emission) | final decay products | F-19 (0) | Ne-20 (0) | O-16 (0) | P-31 (100%)
Decay modes
Al-21
decay mode | p (proton emission) Q-value | 1.26 MeV (megaelectronvolts) daughter nuclide | Mg-20
P-31
![Column[^T, Spacings->1.5]](../image_source/f62acff38de06ec7c4420ff779b0a80b.png)
Column[^T, Spacings->1.5]
Radiation shielding
Radiation shielding
Decay chain
Al-21
Decay chain Al-21
P-31
Decay chain P-31
Mass properties
| Al-21 | P-31 atomic number (Z) | 13 | 15 mass number (A) | 21 | 31 neutron number | 8 | 16 atomic mass | 21.02804 u (unified atomic mass units) | 30.973761629 u (unified atomic mass units) mass excess | 26.119 MeV (megaelectronvolts) | -24.440885 MeV (megaelectronvolts) binding energy per nucleon | 6.343 MeV (megaelectronvolts) | 8.481178 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Al-21 | P-31 spin parity J^π | 5/2^+ (atomic boson) | 1/2^+ (atomic boson) magnetic moment | (unknown) | 1.1316 μ_N
Quantum properties