Input interpretation
As-61 (arsenic-61) | Kr-90 (krypton-90)
Decay properties
| As-61 | Kr-90 half-life | (unknown) | 32.32 s (32.227 to 32.413 s) mean lifetime | (unknown) | 46.63 s (46.496 to 46.76 s) decay constant | | 0.02145 per second specific activity | | 1.436×10^8 TBq/g width | (unknown) | 1.412×10^-17 eV decay modes | p (proton emission) | β^- (electron emission) final decay products | Co-59 (0%) | Fe-56 (0%) | Ni-60 (0%) | Zr-90 (100%)
Decay modes
As-61
decay mode | p (proton emission) Q-value | 2.427 MeV (megaelectronvolts) daughter nuclide | Ge-60
Kr-90
decay mode | β^- (electron emission) branching ratio | 100% Q-value | 4.3919 MeV (megaelectronvolts) daughter nuclide | Rb-90
Radiation shielding
| As-61 lead | 2.91 mm portland concrete | 11.3 mm water | 22.4 mm air | 19 m
Decay chain
As-61
Decay chain As-61
Kr-90
Decay chain Kr-90
Mass properties
| As-61 | Kr-90 atomic number (Z) | 33 | 36 mass number (A) | 61 | 90 neutron number | 28 | 54 atomic mass | 60.98062 u (unified atomic mass units) | 89.919516555 u (unified atomic mass units) mass excess | -18.052 MeV (megaelectronvolts) | -74.969846 MeV (megaelectronvolts) binding energy per nucleon | 7.944 MeV (megaelectronvolts) | 8.591377 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| As-61 | Kr-90 spin parity J^π | 3/2^- (atomic boson) | 0^+ (atomic boson) magnetic moment | (unknown) | 0 μ_N
Quantum properties