Isotope

Isotopic Mass

amu

% Abundance

T_1/2

T_1/2

Units

Mass Excess

KeV

Binding Energy

Per Nucleon

KeV

Decay

Mode

Branching

Ratio

¹⁴³Er

142.96634 (64)

200

ms

-31,350 (600)

7,919 (4)

B+ ?

¹⁴⁴Er

143.96038 (43)

400

ms

-36,910 (400)

7,958 (3)

B+ ?

¹⁴⁵Er

144.95739 (43)

900

ms

-39,690 (400)

7,978 (3)

B+

100

¹⁴⁶Er

145.95200 (32)

1.7

s

-44,710 (300)

8,013 (2)

B+

100

¹⁴⁷Er

146.94949 (32)

~2.5

s

-47,050 (300)

8,029 (2)

B+

100

¹⁴⁸Er

147.94455 (21)

4.6

s

-51,650 (200)

8,061 (1)

B+

100

¹⁴⁹Er

148.942306 (30)

4

s

-53,742 (28)

8,075.0 (1.9)

B+

100

¹⁵⁰Er

149.937914 (18)

18.5

s

-57,833 (17)

8,102.2 (1.2)

B+

100

¹⁵¹Er

150.937449 (18)

23.5

s

-58,266 (16)

8,104.9 (1.1)

B+

100

¹⁵²Er

151.935050 (11)

10.3

s

-60,500 (11)

8,119.35 (7)

A

90 4

¹⁵³Er

152.9350635 (95)

37.1

s

-60,488.0 (8.8)

8,118.95 (5.8)

A

53 3

¹⁵⁴Er

153.9327831 (59)

3.73

m

-62,612.2 (5.5)

8,132.44 (3.6)

B+~100

¹⁵⁵Er

154.9332089 (70)

5.3

m

-62,215.5 (6.5)

8,129.48 (4.2)

B+~100

¹⁵⁶Er

155.931065 (26)

19.5

m

-64,213 (24)

8,141.9 (1.6)

B+

100

¹⁵⁷Er

156.931916 (30)

18.65

m

-63,420 (28)

8,136.4 (1.8)

B+

100

¹⁵⁸Er

157.929893 (27)

2.29

h

-65,304 (25)

8,147.9 (1.6)

EC

100

¹⁵⁹Er

158.9306841 (46)

36

m

-64,567.4 (4.3)

8,142.81 (2.7)

B+

100

¹⁶⁰Er

159.929083 (26)

28.58

h

-66,058 (24)

8,151.7 (1.5)

EC

100

¹⁶¹Er

160.929995 (10)

3.21

h

-65,209.0 (9.4)

8,145.91 (5.8)

B+

100

¹⁶²Er

161.9287783 (37)

0.14 (1)

stable

-66,342.6 (3.5)

8,152.45 (2.1)

¹⁶³Er

162.9300327 (56)

75

m

-65,174.1 (5.2)

8,144.78 (3.2)

B+

100

¹⁶⁴Er

163.9292002 (33)

1.61 (3)

stable

-65,949.6 (3.1)

8,149.06 (1.9)

¹⁶⁵Er

164.9307260 (33)

10.36

h

-64,528.3 (3.1)

8,139.98 (1.9)

EC

100

¹⁶⁶Er

165.9302931 (27)

33.61 (35)

stable

-64,931.6 (2.5)

8,141.99 (1.5)

¹⁶⁷Er

166.9320482 (27)

22.93 (17)

stable

-63,296.7 (2.5)

8,131.78 (1.5)

¹⁶⁸Er

167.9323702 (27)

26.78 (26)

stable

-62,996.7 (2.5)

8,129.63 (1.5)

¹⁶⁹Er

168.9345904 (27)

9.4

d

-60,928.7 (2.5)

8,117.05 (1.5)

B-

100

¹⁷⁰Er

169.9354643 (30)

14.93 (27)

stable

-60,114.6 (2.8)

8,111.99 (1.6)

¹⁷¹Er

170.9380298 (30)

7.516

h

-57,724.9 (2.8)

8,097.78 (1.6)

B-

100

¹⁷²Er

171.9393561 (50)

49.3

h

-56,489.4 (4.6)

8,090.44 (2.7)

B-

100

¹⁷³Er

172.94240 (21)

1.434

m

-53,650 (200)

8,074 (1)

B-

100

¹⁷⁴Er

173.94423 (32)

3.2

m

-51,950 (300)

8,064 (2)

B-

100

¹⁷⁵Er

174.94777 (43)

1.2

m

-48,650 (400)

8,045 (2)

B-

100

¹⁷⁶Er

175.95008 (43)

20

s

-46,500 (400)

8,033 (2)

B- ?

¹⁷⁷Er

176.95405 (54)

3

s

-42,800 (500)

8,013 (3)

B- ?

^147mEr

146.94949 (32)

2.5

s

-47,050 (300)

8,029 (2)

B+

100

^149mEr

148.942306 (30)

8.9

s

-53,742 (28)

8,075.0 (1.9)

B+

96.5 7

^151mEr

150.937449 (18)

580

ms

-58,266 (16)

8,104.9 (1.1)

IT

95.3 3

^157mEr

156.931916 (30)

76

ms

-63,420 (28)

8,136.4 (1.8)

IT

100

^159mEr

158.9306841 (46)

337

ns

-64,567.4 (4.3)

8,142.81 (2.7)

IT

100

^161mEr

160.929995 (10)

7.5

us

-65,209.0 (9.4)

8,145.91 (5.8)

IT

100

^163mEr

162.9300327 (56)

580

ns

-65,174.1 (5.2)

8,144.78 (3.2)

IT

100

^167mEr

166.9320482 (27)

2.269

s

-63,296.7 (2.5)

8,131.78 (1.5)

IT

100

^171mEr

170.9380298 (30)

210

ns

-57,724.9 (2.8)

8,097.78 (1.6)

IT

100

^159m1Er

158.9306841 (46)

590

ns

-64,567.4 (4.3)

8,142.81 (2.7)

IT

100