223 Fr decay; t1/2 = 21.8 m (t = 31.5 m).

  1. 223Fr [b (+ g)] 223Ra   (~ 100%)
  2. 223Fr [a (no g)] 219At   (0.006%;   t1/2 ~ 250 d)
g + c.e.(a) a b
E(b) I(c) (c) Ic.e. E(b) I(c) E(b) I(c)
50.2 2.1 10-4 1.4 10-4     1100 3.8 10-4
20.3 4.7 10-6 3.7 10-5     "  
29.9 1.7 10-7 6.2 10-5     1121 (fed)(d)
      5340 3.6 10-8    

Notes:

  1. c.e.: conversion electrons
  2. Energies in keV
  3. Intensities per `parent' decay of natural U (i.e. 0.956 238U, 0.044 235U)
  4. Data from compilations and amendments in Nuclear Data Sheets to Vol. 64 (1991);
    23 b-decays and 1 other level  (and 57 associated gs) with yields < 0.01% omitted - full details here
    Levels marked `(fed)' receive no direct b-decay, but are fed by gs from higher levels
  5. g and conversion electron intensities are totals from given level; part may be associated with different (lower energy) primaries
  6. 223Fr entry in KAERI nuclide chart