Cesium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

112Cs

111.95030 (33)

 

500

us

-46,290 (300)

8,100 (3)

p

100

113Cs

112.94449 (11)

 

16.7

us

-51,700 (100)

8,148.1 (9.2)

p

100

114Cs

113.94145 (33)

 

570

ms

-54,540 (300)

8,172 (3)

B+~100

 

115Cs

114.93591 (32)

 

1.4

s

-59,700 (300)

8,216 (3)

B+

100

116Cs

115.93337 (11)

 

700

ms

-62,070 (100)

8,235 (1)

B+

100

117Cs

116.928671 (67)

 

8.4

s

-66,443 (62)

8,271.4 (5.3)

B+

100

118Cs

117.926559 (14)

 

14

s

-68,409 (13)

8,286.4 (1.1)

B+

100

119Cs

118.922377 (15)

 

43

s

-72,305 (14)

8,317.3 (1.2)

B+

100

120Cs

119.920677 (11)

 

61.2

s

-73,889 (10)

8,328.48 (8.3)

B+

100

121Cs

120.917229 (15)

 

155

s

-77,100 (14)

8,352.9 (1.1)

B+

100

122Cs

121.916113 (34)

 

21.18

s

-78,140 (32)

8,359.1 (2.6)

B+

100

123Cs

122.912996 (13)

 

5.87

m

-81,044 (12)

8,380.38 (9.8)

B+

100

124Cs

123.9122578 (89)

 

30.9

s

-81,731.3 (8.3)

8,383.43 (6.7)

B+

100

125Cs

124.9097283 (83)

 

45

m

-84,087.6 (7.7)

8,399.79 (6.2)

B+

100

126Cs

125.909452 (13)

 

1.64

m

-84,345 (12)

8,399.22 (9.6)

B+

100

127Cs

126.9074175 (60)

 

6.25

h

-86,240.0 (5.6)

8,411.56 (4.4)

B+

100

128Cs

127.9077489 (59)

 

3.64

m

-85,931.4 (5.5)

8,406.49 (4.3)

B+

100

129Cs

128.9060644 (49)

 

32.06

h

-87,500.4 (4.6)

8,416.06 (3.6)

B+

100

130Cs

129.9067086 (90)

 

29.21

m

-86,900.4 (8.4)

8,408.79 (6.4)

B+

98.4

131Cs

130.9054639 (54)

 

9.689

d

-88,059.8 (5)

8,415.06 (3.8)

EC

132Cs

131.9064343 (20)

 

6.479

d

-87,155.9 (1.9)

8,405.61 (1.4)

B+

98.13 9

133Cs

132.905451932 (23)

100

stable

 

-88,070.958 (22)

8,410 (0)

 

 

134Cs

133.906718475 (28)

 

2.0648

y

-86,891.181 (26)

8,399 (0)

B-

100

135Cs

134.9059770 (11)

 

2.3

My

-87,581.9 (1)

8,401.338 (7)

B-

100

136Cs

135.9073116 (20)

 

13.16

d

-86,338.7 (1.9)

8,389.77 (1.4)

B-

100

137Cs

136.90708947 (49)

 

30.1671

y

-86,545.60 (46)

8,388.956 (3)

B-

100

138Cs

137.9110167 (98)

 

33.41

m

-82,887.4 (9.2)

8,360.15 (6.6)

B-

100

139Cs

138.9133640 (34)

 

9.27

m

-80,700.9 (3.2)

8,342.34 (2.3)

B-

100

140Cs

139.9172824 (88)

 

63.7

s

-77,051.0 (8.2)

8,314.33 (5.9)

B-

100

141Cs

140.920046 (11)

 

24.84

s

-74,477 (11)

8,294.35 (7.5)

B-

100

142Cs

141.924299 (11)

 

1.689

s

-70,515 (11)

8,264.88 (7.5)

B-

100

143Cs

142.927352 (25)

 

1.791

s

-67,671 (24)

8,243.6 (1.7)

B-

100

144Cs

143.932077 (28)

 

994

ms

-63,270 (26)

8,211.9 (1.8)

B-

100

145Cs

144.935526 (12)

 

582

ms

-60,057 (11)

8,188.75 (7.5)

B-

100

146Cs

145.940289 (77)

 

323

ms

-55,620 (71)

8,157.6 (4.9)

B-

100

147Cs

146.944155 (57)

 

225

ms

-52,019 (53)

8,132.5 (3.6)

B-

100

148Cs

147.94922 (62)

 

146

ms

-47,300 (580)

8,100 (3.9)

B-

100

149Cs

148.95293 (21)

 

150

ms

-43,850 (200)

8,077 (1)

B- ?

 

150Cs

149.95817 (32)

 

100

ms

-38,960 (300)

8,044 (2)

B- ?

 

151Cs

150.96219 (54)

 

60

ms

-35,220 (500)

8,020 (3)

B- ?

 

116mCs

115.93337 (11)

 

3.85

s

-62,070 (100)

8,235 (1)

B+

100

117mCs

116.928671 (67)

 

6.5

s

-66,443 (62)

8,271.4 (5.3)

B+

100

118mCs

117.926559 (14)

 

17

s

-68,409 (13)

8,286.4 (1.1)

B+

100

119mCs

118.922377 (15)

 

30.4

s

-72,305 (14)

8,317.3 (1.2)

B+

100

120mCs

119.920677 (11)

 

57

s

-73,889 (10)

8,328.48 (8.3)

B+

100

121mCs

120.917229 (15)

 

122

s

-77,100 (14)

8,352.9 (1.1)

B+

83

122mCs

121.916113 (34)

 

3.7

m

-78,140 (32)

8,359.1 (2.6)

B+

100

123mCs

122.912996 (13)

 

1.64

s

-81,044 (12)

8,380.38 (9.8)

IT

100

124mCs

123.9122578 (89)

 

6.3

s

-81,731.3 (8.3)

8,383.43 (6.7)

IT

100

125mCs

124.9097283 (83)

 

900

ms

-84,087.6 (7.7)

8,399.79 (6.2)

IT

100

126mCs

125.909452 (13)

 

>1

us

-84,345 (12)

8,399.22 (9.6)

IT

100

127mCs

126.9074175 (60)

 

55

us

-86,240.0 (5.6)

8,411.56 (4.4)

IT

100

130mCs

129.9067086 (90)

 

3.46

m

-86,900.4 (8.4)

8,408.79 (6.4)

IT~100

 

134mCs

133.906718475 (28)

 

2.903

h

-86,891.181 (26)

8,399 (0)

IT

100

135mCs

134.9059770 (11)

 

53

m

-87,581.9 (1)

8,401.338 (7)

IT

100

136mCs

135.9073116 (20)

 

19

s

-86,338.7 (1.9)

8,389.77 (1.4)

IT

?

138mCs

137.9110167 (98)

 

2.91

m

-82,887.4 (9.2)

8,360.15 (6.6)

IT

81 2

144mCs

143.932077 (28)

 

<1

s

-63,270 (26)

8,211.9 (1.8)

B-

?

122m1Cs

121.916113 (34)

 

360

ms

-78,140 (32)

8,359.1 (2.6)

IT

100

126m1Cs

125.909452 (13)

 

171

us

-84,345 (12)

8,399.22 (9.6)

IT

100

117m1Cs

116.928671 (67)

 

?

 

-66,443 (62)

8,271.4 (5.3)

0

 

118m1Cs

117.926559 (14)

 

R<0.1

 

-68,409 (13)

8,286.4 (1.1)

0

 

119m1Cs

118.922377 (15)

 

R=.5~~.25

 

-72,305 (14)

8,317.3 (1.2)

0

 

120m1Cs

119.920677 (11)

 

R<0.1

 

-73,889 (10)

8,328.48 (8.3)

0

 

123m1Cs

122.912996 (13)

 

R<0.1

 

-81,044 (12)

8,380.38 (9.8)

0

 

124m1Cs

123.9122578 (89)

 

?

 

-81,731.3 (8.3)

8,383.43 (6.7)

0

 

130m1Cs

129.9067086 (90)

 

R=.2~~~.1

 

-86,900.4 (8.4)

8,408.79 (6.4)

0

 

138m1Cs

137.9110167 (98)

 

?

 

-82,887.4 (9.2)

8,360.15 (6.6)

0

 

Data Source: ENSDF March 2005

©Radiochemistry Society 2005