Input interpretation
![Fr-201 (francium-201) | K-33 (potassium-33)](../image_source/20a6a4444c6925aaae20af5aa767970c.png)
Fr-201 (francium-201) | K-33 (potassium-33)
Decay properties
![| Fr-201 | K-33 half-life | 61 ms (42 to 81 ms) | 25 ns (0 to 29 ns) mean lifetime | 88 ms (69.7 to 106 ms) | 36 ns (-6.675×10^-299 to 37 ns) decay constant | 11 per second | 2.8×10^7 per second specific activity | 3.4×10^10 TBq/g | 5.1×10^17 TBq/g width | 7.5×10^-15 eV | 1.8×10^-8 eV decay modes | α (alpha emission) | β^+ (positron emission) | p (proton emission) final decay products | Os-189 (3.3%) | Au-197 (3%) | Hg-201 (0.06%) | Ir-193 (3×10^-6%) | Re-185 (2×10^-6%) | Ta-181 (5×10^-11%) | P-31 (0%) | Si-28 (0%) | S-32 (0%)](../image_source/3adc7e1ca29080928cd7fb6701168549.png)
| Fr-201 | K-33 half-life | 61 ms (42 to 81 ms) | 25 ns (0 to 29 ns) mean lifetime | 88 ms (69.7 to 106 ms) | 36 ns (-6.675×10^-299 to 37 ns) decay constant | 11 per second | 2.8×10^7 per second specific activity | 3.4×10^10 TBq/g | 5.1×10^17 TBq/g width | 7.5×10^-15 eV | 1.8×10^-8 eV decay modes | α (alpha emission) | β^+ (positron emission) | p (proton emission) final decay products | Os-189 (3.3%) | Au-197 (3%) | Hg-201 (0.06%) | Ir-193 (3×10^-6%) | Re-185 (2×10^-6%) | Ta-181 (5×10^-11%) | P-31 (0%) | Si-28 (0%) | S-32 (0%)
Decay modes
Fr-201
![decay mode | α (alpha emission) branching ratio | 100% Q-value | 7.5157 MeV (megaelectronvolts) daughter nuclide | At-197 decay mode | β^+ (positron emission) branching ratio | 1% Q-value | 6.646 MeV (megaelectronvolts) daughter nuclide | Rn-201](../image_source/8eaadf34f99107a05ca7e2054c2fb660.png)
decay mode | α (alpha emission) branching ratio | 100% Q-value | 7.5157 MeV (megaelectronvolts) daughter nuclide | At-197 decay mode | β^+ (positron emission) branching ratio | 1% Q-value | 6.646 MeV (megaelectronvolts) daughter nuclide | Rn-201
K-33
![decay mode | p (proton emission) Q-value | 1.674 MeV (megaelectronvolts) daughter nuclide | Ar-32](../image_source/51d25e14721006aee12773a701cc356b.png)
decay mode | p (proton emission) Q-value | 1.674 MeV (megaelectronvolts) daughter nuclide | Ar-32
Radiation shielding
![| Fr-201 lead | 25.6 µm water | 70.9 µm air | 64.5 mm](../image_source/44dac5cdd2f4084090d255dd96d1c195.png)
| Fr-201 lead | 25.6 µm water | 70.9 µm air | 64.5 mm
Decay chain
Fr-201
![Decay chain Fr-201](../image_source/2464129bae41a0ad596f21cfe5c60ae9.png)
Decay chain Fr-201
K-33
![Decay chain K-33](../image_source/db64685d804c8f080f8959d04ff56ecc.png)
Decay chain K-33
Mass properties
![| Fr-201 | K-33 atomic number (Z) | 87 | 19 mass number (A) | 201 | 33 neutron number | 114 | 14 atomic mass | 201.003860867 u (unified atomic mass units) | 33.00726 u (unified atomic mass units) mass excess | 3.596375 MeV (megaelectronvolts) | 6.763 MeV (megaelectronvolts) binding energy per nucleon | 7.714797 MeV (megaelectronvolts) | 7.416 MeV (megaelectronvolts)](../image_source/79387619ed53537c503eef0707dce79a.png)
| Fr-201 | K-33 atomic number (Z) | 87 | 19 mass number (A) | 201 | 33 neutron number | 114 | 14 atomic mass | 201.003860867 u (unified atomic mass units) | 33.00726 u (unified atomic mass units) mass excess | 3.596375 MeV (megaelectronvolts) | 6.763 MeV (megaelectronvolts) binding energy per nucleon | 7.714797 MeV (megaelectronvolts) | 7.416 MeV (megaelectronvolts)
![Mass properties](../image_source/e2bdd5b01f54da29773bca53509ccc9d.png)
Mass properties
Nearby isotopes
![Nearby isotopes](../image_source/201db6288d6cb9a656f64047e425672e.png)
Nearby isotopes
Quantum properties
![| Fr-201 | K-33 spin parity J^π | 9/2^- (atomic boson) | 3/2^+ (atomic boson)](../image_source/3da4d7c38627f123592d8125a2c4c8bb.png)
| Fr-201 | K-33 spin parity J^π | 9/2^- (atomic boson) | 3/2^+ (atomic boson)
![Quantum properties](../image_source/ccc82a84fe8f275d5c205e8dedd5de47.png)
Quantum properties