Isotope

Isotopic Mass

amu

% Abundance

T_1/2

T_1/2

Units

Mass Excess

KeV

Binding Energy

Per Nucleon

KeV

Decay

Mode

Branching

Ratio

¹²⁸Sm

127.95808 (54)

500

ms

-39,050 (500)

7,997 (4)

B+ ?

¹²⁹Sm

128.95464 (54)

550

ms

-42,250 (500)

8,023 (4)

B+

100

¹³⁰Sm

129.94892 (43)

1

s

-47,580 (400)

8,064 (3)

B+ ?

¹³¹Sm

130.94611 (32)

1.2

s

-50,200 (300)

8,084 (2)

B+

100

¹³²Sm

131.94069 (32)

4

s

-55,250 (300)

8,122 (2)

B+

100

¹³³Sm

132.93867 (21)

2.9

s

-57,130 (200)

8,136 (1)

B+

100

¹³⁴Sm

133.93397 (21)

10

s

-61,510 (200)

8,168 (1)

B+

100

¹³⁵Sm

134.93252 (17)

10.3

s

-62,860 (150)

8,178 (1.1)

B+

100

¹³⁶Sm

135.928276 (13)

47

s

-66,811 (12)

8,205.92 (9.2)

B+

100

¹³⁷Sm

136.926972 (46)

45

s

-68,025 (42)

8,213.8 (3.1)

B+

100

¹³⁸Sm

137.923244 (13)

3.1

m

-71,498 (12)

8,237.93 (8.6)

B+

100

¹³⁹Sm

138.922297 (12)

2.57

m

-72,380 (11)

8,243.08 (7.8)

B+

100

¹⁴⁰Sm

139.918995 (13)

14.82

m

-75,456 (12)

8,263.82 (8.9)

B+

100

¹⁴¹Sm

140.9184765 (93)

10.2

m

-75,938.7 (8.6)

8,265.88 (6.1)

B+

100

¹⁴²Sm

141.9151976 (61)

72.49

m

-78,992.9 (5.7)

8,286.02 (4)

B+

100

¹⁴³Sm

142.9146283 (39)

8.75

m

-79,523.2 (3.6)

8,288.22 (2.5)

B+

100

¹⁴⁴Sm

143.9119995 (30)

3.07 (7)

stable

-81,972.0 (2.8)

8,303.72 (1.9)

¹⁴⁵Sm

144.9134104 (30)

340

d

-80,657.7 (2.8)

8,293.06 (1.9)

EC

100

¹⁴⁶Sm

145.9130409 (39)

103

My

-81,001.9 (3.6)

8,293.90 (2.5)

A

100

¹⁴⁷Sm

146.9148979 (26)

14.99 (18)

106

Gy

-79,272.1 (2.4)

8,280.61 (1.6)

¹⁴⁸Sm

147.9148227 (26)

11.24 (10)

7

Py

-79,342.2 (2.4)

8,279.67 (1.6)

¹⁴⁹Sm

148.9171847 (26)

13.82 (7)

stable

-77,141.9 (2.4)

8,263.51 (1.6)

¹⁵⁰Sm

149.9172755 (26)

7.38 (1)

stable

-77,057.3 (2.4)

8,261.66 (1.6)

¹⁵¹Sm

150.9199324 (26)

90

y

-74,582.5 (2.4)

8,244.01 (1.6)

B-

100

¹⁵²Sm

151.9197324 (27)

26.75 (16)

stable

-74,768.8 (2.5)

8,244.10 (1.6)

¹⁵³Sm

152.9220974 (27)

46.284

h

-72,565.8 (2.5)

8,228.57 (1.6)

B-

100

¹⁵⁴Sm

153.9222093 (27)

22.75 (29)

stable

-72,461.6 (2.5)

8,226.88 (1.7)

¹⁵⁵Sm

154.9246402 (28)

22.3

m

-70,197.2 (2.6)

8,211.26 (1.7)

B-

100

¹⁵⁶Sm

155.925528 (10)

9.4

h

-69,370.3 (9.5)

8,205.07 (6.1)

B-

100

¹⁵⁷Sm

156.928359 (54)

8.03

m

-66,733 (50)

8,187.4 (3.2)

B-

100

¹⁵⁸Sm

157.929991 (84)

5.3

m

-65,213 (78)

8,177.1 (5)

B-

100

¹⁵⁹Sm

158.93321 (11)

11.37

s

-62,210 (100)

8,157.5 (6.3)

B-

100

¹⁶⁰Sm

159.93514 (21)

9.6

s

-60,420 (200)

8,146 (1)

B-

100

¹⁶¹Sm

160.93883 (32)

4.8

s

-56,980 (300)

8,124 (2)

B-

100

¹⁶²Sm

161.94122 (54)

2.4

s

-54,750 (500)

8,110 (3)

B-

100

¹⁶³Sm

162.94536 (75)

1

s

-50,900 (700)

8,086 (4)

B- ?

¹⁶⁴Sm

163.94828 (86)

500

ms

-48,180 (800)

8,069 (5)

B- ?

¹⁶⁵Sm

164.95298 (97)

200

ms

-43,800 (900)

8,043 (5)

B- ?

^135mSm

134.93252 (17)

2.4

s

-62,860 (150)

8,178 (1.1)

B+

100

^136mSm

135.928276 (13)

15

us

-66,811 (12)

8,205.92 (9.2)

IT

100

^137mSm

136.926972 (46)

20

s

-68,025 (42)

8,213.8 (3.1)

B+ ?

^139mSm

138.922297 (12)

10.7

s

-72,380 (11)

8,243.08 (7.8)

IT

93.7 5

^141mSm

140.9184765 (93)

22.6

m

-75,938.7 (8.6)

8,265.88 (6.1)

B+~100

^143mSm

142.9146283 (39)

66

s

-79,523.2 (3.6)

8,288.22 (2.5)

IT~100

^144mSm

143.9119995 (30)

880

ns

-81,972.0 (2.8)

8,303.72 (1.9)

IT

100

^145mSm

144.9134104 (30)

990

ns

-80,657.7 (2.8)

8,293.06 (1.9)

IT

100

^151mSm

150.9199324 (26)

1.4

us

-74,582.5 (2.4)

8,244.01 (1.6)

IT

100

^153mSm

152.9220974 (27)

10.6

ms

-72,565.8 (2.5)

8,228.57 (1.6)

IT

100

^156mSm

155.925528 (10)

185

ns

-69,370.3 (9.5)

8,205.07 (6.1)

IT

100

^143m1Sm

142.9146283 (39)

30

ms

-79,523.2 (3.6)

8,288.22 (2.5)

IT

100