Einsteinium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

240Es

240.06892 (43)

 

1

s

64,200 (400)

7,481 (2)

A ?

 

241Es

241.06854 (24)

 

10

s

63,840 (230)

7,485 (1)

A

?

242Es

242.06975 (35)

 

13.5

s

64,970 (330)

7,483 (1)

A

?

243Es

243.06955 (25)

 

21

s

64,780 (230)

7,486 (1)

B+ LE 70

 

244Es

244.07088 (20)

 

37

s

66,030 (180)

7,483 (1)

B+

?

245Es

245.07132 (22)

 

1.1

m

66,440 (200)

7,484 (1)

B+

60 10

246Es

246.07290 (24)

 

7.7

m

67,900 (220)

7,480 (1)

B+

90.1 18

247Es

247.073656 (33)

 

4.6

m

68,610 (30)

7,480 (0)

B+~93

 

248Es

248.075471 (56)

 

27

m

70,301 (52)

7,476 (0)

B+~100

 

249Es

249.076411 (32)

 

102.2

m

71,176 (30)

7,474 (0)

B+~100

 

250Es

250.07861 (11)

 

8.6

h

73,230 (100)

7,469 (0)

B+>97

 

251Es

251.0799921 (65)

 

33

h

74,512.2 (6.1)

7,465.88 (2.4)

EC ?

 

252Es

252.082979 (54)

 

471.7

d

77,294 (50)

7,457.2 (2)

A

78 2

253Es

253.0848247 (28)

 

20.47

d

79,013.7 (2.6)

7,452.87 (1)

A

100

254Es

254.0880220 (46)

 

275.7

d

81,992.0 (4.2)

7,443.58 (1.7)

A~100

 

255Es

255.090273 (12)

 

39.8

d

84,089 (11)

7,437.82 (4.3)

B-

92.0 4

256Es

256.09360 (11)

 

25.4

m

87,190 (100)

7,428 (0)

B-

100

257Es

257.09598 (44)

 

7.7

d

89,400 (410)

7,422 (2)

B-

100

258Es

258.09952 (32)

 

3

m

92,700 (300)

7,412 (1)

B- ?

 

248mEs

248.075471 (56)

 

41

m

70,301 (52)

7,476 (0)

0

250mEs

250.07861 (11)

 

2.22

h

73,230 (100)

7,469 (0)

B+~100

 

254mEs

254.0880220 (46)

 

39.3

h

81,992.0 (4.2)

7,443.58 (1.7)

B-

98 2

256mEs

256.09360 (11)

 

7.6

h

87,190 (100)

7,428 (0)

B-~100

 

241mEs

241.06854 (24)

 

 

 

63,840 (230)

7,485 (1)

0

 

243mEs

243.06955 (25)

 

 

 

64,780 (230)

7,486 (1)

0

 

244mEs

244.07088 (20)

 

 

 

66,030 (180)

7,483 (1)

0

 

245mEs

245.07132 (22)

 

 

 

66,440 (200)

7,484 (1)

0

 

246mEs

246.07290 (24)

 

 

 

67,900 (220)

7,480 (1)

0

 

247mEs

247.073656 (33)

 

 

 

68,610 (30)

7,480 (0)

0

 

245m1Es

245.07132 (22)

 

 

 

66,440 (200)

7,484 (1)

0

 

Data Source: ENSDF March 2005

©Radiochemistry Society 2005