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)
893.0 8.5 10-9       208.0 1.8 10-8
863.0 1.2 10-8 5.1 10-11     "  
896.0 10-7 3.9 10-10     224.0 8.5 10-7
876.0 2.7 10-7 1.1 10-9     "  
847.0 2.7 10-7 1.1 10-9     "  
908.0 8.5 10-8 3.2 10-10     243.0 1.1 10-7
878.0 4.3 10-9       "  
891.0 1.2 10-8       260.0 1.2 10-8
849.0 2.1 10-8 8.9 10-11     272.0 2.0 10-7
868.0 8.5 10-9       283.0 4.9 10-8
837.0 4.1 10-8 1.8 10-10     "  
859.0 2.1 10-8 8.7 10-11     292.0 1.5 10-7
828.0 6.1 10-8 2.7 10-10     "  
797.0 6.1 10-8 2.9 10-10     "  
842.0 4.1 10-8 1.8 10-10     308.0 2.4 10-7
812.0 1.2 10-7 5.6 10-10     "  
826.0 2.7 10-7 1.2 10-9     325.0 3.1 10-6
775.0 2.5 10-6 1.3 10-8     "  
766.0 1.6 10-7 8.4 10-10     "  
746.0 1.5 10-7 7.9 10-10     "  
823.0 6.1 10-8 2.7 10-10     328.0 1.2 10-7
793.0 5.3 10-8 2.6 10-10     "  
757.0 8.5 10-8 4.5 10-10     332.0 2.4 10-7
804.0 3.5 10-7 1.7 10-9     347.0 7.3 10-7
754.0 4.1 10-8 2.2 10-10     "  
724.0 3.1 10-7 1.8 10-9     "  
793.0 2.9 10-8 1.4 10-10     358.0 8.5 10-8
787.0 10-7 5.1 10-10     364.0 4.9 10-7
757.0 8.5 10-8 4.5 10-10     "  
784.0 4.1 10-8 2.0 10-10     367.0 3.6 10-7
754.0 4.1 10-8 2.2 10-10     "  
369.0 6.7 10-7 1.5 10-8     782.0 1.4 10-5
339.0 4.1 10-7 1.1 10-8     "  
319.0 3.5 10-6 1.1 10-7     "  
307.0 1.9 10-7 6.4 10-9     "  
290.0 1.6 10-6 6.6 10-8     "  
134.0 3.3 10-6 5.3 10-7     "  
342.0 1.9 10-7 6.3 10-8     808.0 1.2 10-6
313.0 1.6 10-7 1.1 10-7     "  
334.0 9.1 10-8 4.1 10-8     816.0 5.5 10-7
304.0 1.4 10-7 9.5 10-8     "  
330.0 2.1 10-7 5.9 10-9     821.0 8.5 10-7
300.0 2.7 10-7 9.6 10-9     "  
250.0 2.7 10-7 1.4 10-7     "  
286.0 1.1 10-7 6.9 10-8     864.0 5.5 10-7
256.0 2.7 10-7 6.9 10-8     "  
235.0 2.1 10-5 3.0 10-5     916.0 7.3 10-5
205.0 5.8 10-6 1.2 10-5     "  
185.0 1.9 10-6 2.1 10-7     "  
173.0 8.5 10-8 1.6 10-7     "  
100.0 6.1 10-6 5.8 10-5     1020 2.5 10-5
68.8 5.7 10-7 1.1 10-5     "  
79.8 5.6 10-5 1.1 10-5     1072 8.2 10-5
49.9 4.5 10-6 3.2 10-6     "  
29.6 1.6 10-7 1.9 10-5     "  
61.5 1.6 10-6 1.6 10-4     1089 (fed)(d)
31.6 3.7 10-8 9.7 10-6     "  
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)
    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