U235 Decay Series

Characteristic X-Rays

 

             Isotope                                   half-life                           X-Ray energies (KeV)

U235

7.038 x 108 years

16.2 (31%)

90.0 (3.56%)

93.4 (5.81%)

105.2 (2.01%)

Th231

25.5 hours

16.7 (96%)

Pa231

3.25 x 104 years

15.7 (44.8%)

Ac227

21.6 years

------

98.6%                     1.4%

Th227

 

 

 

                              Fr223

 

18.2 days

 

 

 

                          22 minutes

 

15.2 (42%)

85.4 (1.86%)

88.5 (3.06%)

99.8 (1.06%)

                        15.2 (23.9%)

                        85.4 (1.69%)

                        88.5 (2.8%)

Ra223

11.43 days

14.3 (24.5%)

81.1 (15%)

83.8 (24.9%)

94.6 (8.59%)

97.3 (2.8%)

Rn219

4 seconds

13.4 (1.01%)

Po215

1.78 millisec

------

Pb211

36.1 minutes

------

Bi211

2.15 minutes

12.2 (1.02%)

72.9 (1.25%)

0.28%                 99.7%

Po211

                           Tl207

 

0.52 seconds

                        4.79 minutes

 

------

                         ------

Pb207

stable

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