U-238 Decay Series

 

             Isotope                                   half-life                            gamma energies (KeV)

U238

4.468 x 109 years

----

Th234

24.1 days

63.3 (4.47%)

92.38 (2.60%)

92.80 (2.56%)

Pa234m

1.17 minutes

765 (0.207%)

1001 (0.59%)

99.8%                    0.13%

                              Pa234

 

                            6.75 hours

 

                        100 (50%)

                        700 (24%)

                        900 (70%)

U234

2.47 x 105 years

53.2 (0.123%)

Th230

8.0 x 104 years

67.7 (0.373%)

Ra226

1602 years

186.2 (3.50%)

Rn222

3.823 days

510 (0.076%)

Pc218

3.05 minutes

------

99.98%               0.02%

Pb214

 

 

 

 

                           At218

 

26.8 minutes

 

 

 

 

                      2 seconds

 

53.2 (1.1%)

242.0 (7.46%)

295.2 (19.2%)

351.9 (37.1%)

785.9 (1.09%)

                              -----

Bi214

19.7 minutes

609.3 (46.1%)

768.4 (4.89%)

806.2 (1.23%)

934.1 (3.16%)

1120.3 (15.0%)

1238.1 (5.92%)

1377.7 (4.02%)

1408.0 (2.48%)

1509.2 (2.19%)

1764.5 (15.9%)

99.98%               0.02%

Po214

                            Tl210

 

164 microsec

                         1.3 minutes

 

799 (0.014%)

                       296 (80%)

                       795 (100%)

                       1310 (21%)

Pb210

21 years

46.5 (4.05%)

Bi210

5.01 days

------

Po210

138.4 days

803 (0.0011%)

Pb206

Stable

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