Cerium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

119Ce

118.95276 (64)

 

200

ms

-44,000 (600)

8,060 (5)

B+ ?

 

120Ce

119.94664 (75)

 

250

ms

-49,710 (700)

8,107 (6)

B+ ?

 

121Ce

120.94342 (54)

 

1.1

s

-52,700 (500)

8,132 (4)

B+

100

122Ce

121.93791 (43)

 

2

s

-57,840 (400)

8,173 (3)

B+ ?

 

123Ce

122.93540 (32)

 

3.8

s

-60,180 (300)

8,192 (2)

B+

100

124Ce

123.93041 (32)

 

9.1

s

-64,820 (300)

8,228 (2)

B+

100

125Ce

124.92844 (21)

 

9.3

s

-66,660 (200)

8,242 (2)

B+

100

126Ce

125.923971 (30)

 

51

s

-70,821 (28)

8,273.3 (2.2)

B+

100

127Ce

126.922731 (62)

 

29

s

-71,976 (58)

8,280.8 (4.6)

B+

100

128Ce

127.918911 (30)

 

3.93

m

-75,534 (28)

8,306.9 (2.2)

B+

100

129Ce

128.918102 (30)

 

3.5

m

-76,287 (28)

8,310.9 (2.2)

B+

100

130Ce

129.914736 (30)

 

22.9

m

-79,423 (28)

8,333.2 (2.2)

B+

100

131Ce

130.914422 (36)

 

10.2

m

-79,715 (34)

8,333.4 (2.6)

B+

100

132Ce

131.911460 (22)

 

3.51

h

-82,474 (21)

8,352.4 (1.6)

B+

100

133Ce

132.911515 (18)

 

97

m

-82,423 (16)

8,349.9 (1.2)

B+

100

134Ce

133.908925 (22)

 

3.16

d

-84,836 (20)

8,365.8 (1.5)

EC

100

135Ce

134.909151 (12)

 

17.7

h

-84,625 (11)

8,362.05 (8.2)

B+

100

136Ce

135.907172 (14)

0.185 (2)

stable

 

-86,468 (13)

8,373.47 (9.8)

 

 

137Ce

136.907806 (14)

 

9

h

-85,879 (13)

8,366.96 (9.7)

B+

100

138Ce

137.905991 (11)

0.251 (2)

stable

 

-87,569 (10)

8,377.06 (7.4)

 

139Ce

138.9066527 (79)

 

137.641

d

-86,952.5 (7.3)

8,370.43 (5.3)

EC

100

140Ce

139.9054387 (26)

88.450 (51)

stable

 

-88,083.3 (2.5)

8,376.37 (1.8)

 

 

141Ce

140.9082763 (26)

 

32.508

d

-85,440.1 (2.5)

8,355.46 (1.7)

B-

100

142Ce

141.9092442 (32)

11.114 (51)

stable

 

-84,538.5 (3)

8,347.11 (2.1)

 

 

143Ce

142.9123859 (32)

 

33.039

h

-81,612.0 (3)

8,324.72 (2.1)

B-

100

144Ce

143.9136473 (37)

 

284.91

d

-80,437.0 (3.4)

8,314.80 (2.4)

B-

100

145Ce

144.917233 (45)

 

3.01

m

-77,097 (41)

8,290.1 (2.9)

B-

100

146Ce

145.918759 (71)

 

13.52

m

-75,675 (66)

8,278.8 (4.6)

B-

100

147Ce

146.922674 (33)

 

56.4

s

-72,029 (31)

8,252.6 (2.1)

B-

100

148Ce

147.924432 (32)

 

56

s

-70,391 (29)

8,240.3 (2)

B-

100

149Ce

148.92840 (10)

 

5.3

s

-66,695 (97)

8,214.4 (6.5)

B-

100

150Ce

149.930409 (51)

 

4

s

-64,824 (48)

8,201.0 (3.2)

B-

100

151Ce

150.93398 (11)

 

1.02

s

-61,500 (100)

8,178.1 (6.8)

B-

100

152Ce

151.93654 (21)

 

1.1

s

-59,110 (200)

8,162 (1)

B-

100

153Ce

152.94058 (43)

 

500

ms

-55,350 (400)

8,137 (3)

B- ?

 

154Ce

153.94342 (54)

 

300

ms

-52,700 (500)

8,119 (3)

B- ?

 

155Ce

154.94804 (64)

 

200

ms

-48,400 (600)

8,091 (4)

B- ?

 

156Ce

155.95126 (64)

 

150

ms

-45,400 (600)

8,071 (4)

B- ?

 

157Ce

156.95634 (75)

 

50

ms

-40,670 (700)

8,041 (4)

B- ?

 

127mCe

126.922731 (62)

 

34

s

-71,976 (58)

8,280.8 (4.6)

B+

100

129mCe

128.918102 (30)

 

62

ns

-76,287 (28)

8,310.9 (2.2)

IT

100

130mCe

129.914736 (30)

 

100

ns

-79,423 (28)

8,333.2 (2.2)

IT

100

131mCe

130.914422 (36)

 

5

m

-79,715 (34)

8,333.4 (2.6)

B+

100

132mCe

131.911460 (22)

 

9.4

ms

-82,474 (21)

8,352.4 (1.6)

IT

100

133mCe

132.911515 (18)

 

4.9

h

-82,423 (16)

8,349.9 (1.2)

B+

100

135mCe

134.909151 (12)

 

20

s

-84,625 (11)

8,362.05 (8.2)

IT

100

136mCe

135.907172 (14)

 

2.2

us

-86,468 (13)

8,373.47 (9.8)

IT

100

137mCe

136.907806 (14)

 

34.4

h

-85,879 (13)

8,366.96 (9.7)

IT

99.22 3

138mCe

137.905991 (11)

 

8.65

ms

-87,569 (10)

8,377.06 (7.4)

IT

100

139mCe

138.9066527 (79)

 

56.54

s

-86,952.5 (7.3)

8,370.43 (5.3)

IT

100

140mCe

139.9054387 (26)

 

7.3

us

-88,083.3 (2.5)

8,376.37 (1.8)

0

 

131m1Ce

130.914422 (36)

 

70

ns

-79,715 (34)

8,333.4 (2.6)

0

 

Data Source: ENSDF March 2005

©Radiochemistry Society 2005