SLICS – Short Lived Isotope Counting Services

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Table 6-1. Uranium decay series of Uranium 238  
Isotope             Emitted particle                         Half-life Isotope  

238U                              α                                  4.47 billion yrs
    ↓
234Th                            β-                                 24.1 days
    ↓
234Pa                            β-                                 1.17 minutes
    ↓
234U                              α                                  248,000 yrs
    ↓
230Th                            α                                  75,200 yrs
    ↓
226Ra                            α                                  1600 yrs
    ↓
222Rn                            α                                  3.8235 days
    ↓
218Po                            α                                  3.10 minutes
    ↓
214Pb                            β-                                 27 minutes
    ↓
214Bi                             β-                                 19.9 minutes
    ↓
214Po                            α                                  0.000164 seconds
    ↓
210Pb                            β-                                 22.3 yrs
    ↓
210Bi                             β-                                 5.01 days
    ↓
210Po                            α                                  138.38 days
    ↓
206Pb                            Stable