Gadolinium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

134Gd

133.95537 (43)

 

400

ms

-41,570 (400)

8,008 (3)

B+ ?

 

135Gd

134.95257 (54)

 

1.1

s

-44,180 (500)

8,028 (4)

B+

100

136Gd

135.94734 (43)

 

1

s

-49,050 (400)

8,064 (3)

B+ ?

 

137Gd

136.94502 (43)

 

2.2

s

-51,210 (400)

8,080 (3)

B+

100

138Gd

137.94012 (21)

 

4.7

s

-55,780 (200)

8,113 (1)

B+

100

139Gd

138.93824 (21)

 

5.7

s

-57,530 (200)

8,125 (1)

B+

100

140Gd

139.933674 (30)

 

15.8

s

-61,782 (28)

8,155.0 (2)

B+

100

141Gd

140.932126 (21)

 

14

s

-63,224 (20)

8,164.6 (1.4)

B+

100

142Gd

141.928116 (30)

 

70.2

s

-66,960 (28)

8,190.3 (2)

B+

100

143Gd

142.92675 (22)

 

39

s

-68,230 (200)

8,198 (1.4)

B+

100

144Gd

143.922963 (30)

 

4.47

m

-71,760 (28)

8,221.9 (1.9)

B+

100

145Gd

144.921709 (20)

 

23

m

-72,927 (19)

8,229.0 (1.3)

B+

100

146Gd

145.9183106 (51)

 

48.27

d

-76,093.2 (4.7)

8,249.56 (3.2)

EC

100

147Gd

146.9190944 (33)

 

38.06

h

-75,363.1 (3)

8,243.38 (2.1)

B+

100

148Gd

147.9181145 (30)

 

74.6

y

-76,275.8 (2.8)

8,248.38 (1.9)

A

100

149Gd

148.9193409 (42)

 

9.28

d

-75,133.5 (4)

8,239.53 (2.7)

B+

100

150Gd

149.9186589 (68)

 

1.79

My

-75,768.8 (6.3)

8,242.64 (4.2)

A

100

151Gd

150.9203485 (39)

 

124

d

-74,194.9 (3.7)

8,231.08 (2.4)

EC

100

152Gd

151.9197910 (27)

0.20 (1)

108

Ty

-74,714.2 (2.5)

8,233.45 (1.7)

 

 

153Gd

152.9217495 (27)

 

240.4

d

-72,889.8 (2.5)

8,220.47 (1.6)

EC

154Gd

153.9208656 (27)

2.18 (3)

stable

 

-73,713.2 (2.5)

8,224.84 (1.6)

 

 

155Gd

154.9226220 (27)

14.80 (12)

stable

 

-72,077.1 (2.5)

8,213.30 (1.6)

 

 

156Gd

155.9221227 (27)

20.47 (9)

stable

 

-72,542.2 (2.5)

8,215.37 (1.6)

 

 

157Gd

156.9239601 (27)

15.65 (2)

stable

 

-70,830.7 (2.5)

8,203.55 (1.6)

 

 

158Gd

157.9241039 (27)

24.84 (7)

stable

 

-70,696.8 (2.5)

8,201.87 (1.6)

 

 

159Gd

158.9263887 (27)

 

18.479

h

-68,568.5 (2.5)

8,187.66 (1.6)

B-

100

160Gd

159.9270541 (27)

21.86 (19)

stable

 

-67,948.6 (2.6)

8,183.06 (1.6)

 

 

161Gd

160.9296692 (29)

 

3.646

m

-65,512.7 (2.7)

8,167.23 (1.7)

B-

100

162Gd

161.9309848 (49)

 

8.4

m

-64,287.3 (4.6)

8,159.08 (2.8)

B-

100

163Gd

162.93399 (32)

 

68

s

-61,490 (300)

8,141 (2)

B-

100

164Gd

163.93586 (43)

 

45

s

-59,750 (400)

8,130 (2)

B-

100

165Gd

164.93938 (54)

 

10.3

s

-56,470 (500)

8,110 (3)

B-

100

166Gd

165.94160 (64)

 

4.8

s

-54,400 (600)

8,097 (4)

B-

100

167Gd

166.94557 (64)

 

3

s

-50,700 (600)

8,075 (4)

B- ?

 

168Gd

167.94836 (75)

 

300

ms

-48,100 (700)

8,060 (4)

B- ?

 

169Gd

168.95287 (86)

 

1

s

-43,900 (800)

8,035 (5)

B- ?

 

138mGd

137.94012 (21)

 

6

us

-55,780 (200)

8,113 (1)

0

 

139mGd

138.93824 (21)

 

4.8

s

-57,530 (200)

8,125 (1)

B+

100

141mGd

140.932126 (21)

 

24.5

s

-63,224 (20)

8,164.6 (1.4)

B+

89 2

143mGd

142.92675 (22)

 

110

s

-68,230 (200)

8,198 (1.4)

B+

100

145mGd

144.921709 (20)

 

85

s

-72,927 (19)

8,229.0 (1.3)

IT

94.3 5

147mGd

146.9190944 (33)

 

510

ns

-75,363.1 (3)

8,243.38 (2.1)

IT

100

153mGd

152.9217495 (27)

 

3.5

us

-72,889.8 (2.5)

8,220.47 (1.6)

IT

100

155mGd

154.9226220 (27)

 

32

ms

-72,077.1 (2.5)

8,213.30 (1.6)

IT

100

156mGd

155.9221227 (27)

 

1.3

us

-72,542.2 (2.5)

8,215.37 (1.6)

IT

100

153m1Gd

152.9217495 (27)

 

76

us

-72,889.8 (2.5)

8,220.47 (1.6)

IT

100

Data Source: ENSDF March 2005

©Radiochemistry Society 2005