Isotope

Isotopic Mass

amu

% Abundance

T_1/2

T_1/2

Units

Mass Excess

KeV

Binding Energy

Per Nucleon

KeV

Decay

Mode

Branching

Ratio

²³⁷Cf

237.06207 (54)

2.1

s

57,820 (500)

7,504 (2)

A ?

²³⁸Cf

238.06141 (43)

21.1

ms

57,200 (400)

7,509 (2)

SF~100

²³⁹Cf

239.06242 (23)

60

s

58,150 (210)

7,507 (1)

A

?

²⁴⁰Cf

240.06230 (22)

1.06

m

58,030 (200)

7,510 (1)

A~98

²⁴¹Cf

241.06373 (27)

3.8

m

59,360 (260)

7,507 (1)

B+~75

²⁴²Cf

242.063702 (40)

3.49

m

59,338 (37)

7,509.3 (1.5)

A

80 20

²⁴³Cf

243.06543 (15)

10.7

m

60,950 (140)

7,505 (1)

B+~86

²⁴⁴Cf

244.0660007 (31)

19.4

m

61,479.2 (2.9)

7,505.13 (1.2)

A~100

²⁴⁵Cf

245.0680486 (31)

45

m

63,386.9 (2.9)

7,499.66 (1.2)

B+

64 3

²⁴⁶Cf

246.0688053 (22)

35.7

h

64,091.7 (2.1)

7,499.115 (9)

A

100

²⁴⁷Cf

247.0710006 (87)

3.11

h

66,136.6 (8.1)

7,493.15 (3.3)

EC~100

²⁴⁸Cf

248.0721849 (57)

334

d

67,239.8 (5.3)

7,491.04 (2.1)

A~100

²⁴⁹Cf

249.0748535 (24)

351

y

69,725.6 (2.2)

7,483.383 (9)

A

100

²⁵⁰Cf

250.0764061 (22)

13.08

y

71,171.8 (2.1)

7,479.950 (8)

A~100

²⁵¹Cf

251.0795868 (48)

900

y

74,134.6 (4.5)

7,470.50 (1.8)

A~100

²⁵²Cf

252.0816258 (54)

2.645

y

76,034.0 (5.1)

7,465.35 (2)

A

96.908 8

²⁵³Cf

253.0851331 (66)

17.81

d

79,301.0 (6.2)

7,454.83 (2.4)

B-~100

²⁵⁴Cf

254.087323 (13)

60.5

d

81,341 (12)

7,449.23 (4.8)

SF~100

²⁵⁵Cf

255.09105 (22)

85

m

84,810 (200)

7,438 (1)

B-

100

²⁵⁶Cf

256.09344 (32)

12.3

m

87,040 (300)

7,432 (1)

SF

^249mCf

249.0748535 (24)

45

us

69,725.6 (2.2)

7,483.383 (9)

IT

100

^241mCf

241.06373 (27)

59,360 (260)

7,507 (1)

0

^245mCf

245.0680486 (31)

63,386.9 (2.9)

7,499.66 (1.2)

0