228 Ra decay; t1/2 = 5.75 y (t = 8.30 y).

  1. 228Ra [b (+ g)] 228Ac
g + c.e.(a) b
E(b) I(c) (c) Ic.e. E(b) I(c)
30.6 8.0 10-5 0.080 14.5 0.400
26.4 1.5 10-5 0.030 "  
19.4 1.4 10-4 0.0011 "  
18.8 0.0021 0.013 "  
16.2 0.0072 0.066 "  
15.5 0.0016 0.0067 "  
13.5 0.016 0.097 "  
12.8 0.0030 0.027 "  
6.7 3.1 10-7 0.501 39.0 0.600
6.3 1.4 10-8 0.100 "  

Notes:

  1. c.e.: conversion electrons
  2. Energies in keV
  3. Intensities per `parent' decay of Th
  4. Data from compilations and amendments in Nuclear Data Sheets to Vol. 64 (1991)
  5. 228Ra entry in KAERI nuclide chart