U-238 Decay Series

Characteristic X-Rays

 

             Isotope                                   half-life                              X-Ray energies (KeV)

U238

4.468 x 109 years

16.2 (8%)

Th234

24.1 days

16.7 (10%)

Pa234m

1.17 minutes

17.2 (.42%)

99.8%                    0.13%

                              Pa234

 

                            6.75 hours

 

 ------                      

U234

2.47 x 105 years

12.97 (3.66%)

16.2 (4.87%)

18.98 (1.05%)

Th230

8.0 x 104 years

15.2 (8.5%)

Ra226

1602 years

14.3 (0.858%)

81.1 (0.192%)

83.8 (0.319%)

94.6 (0.11%)

Rn222

3.823 days

------

Po218

3.05 minutes

------

99.98%               0.02%

Pb214

 

 

 

 

                           At218

 

26.8 minutes

 

 

 

 

                      2 seconds

 

13.0 (13.8%)

74.8 (6.41%)

77.1 (10.8%)

87.1 (3.71%)

89.6 (1.12%)

                              -----

Bi214

19.7 minutes

13.4 (0.552%)

76.9 (0.351%)

79.3 (0.588%)

89.5 (0.203%)

99.98%               0.02%

Po214

                            Tl210

 

164 microsec

                         1.3 minutes

 

-----

                        -----

Pb210

21 years

13.0 (24.3%)

Bi210

5.01 days

------

Po210

138.4 days

------

Pb206

Stable

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