Berkelium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

235Bk

235.05658 (43)

 

20

s

52,700 (400)

7,524 (2)

B+ ?

 

236Bk

236.05733 (43)

 

1

m

53,400 (400)

7,523 (2)

B+ ?

 

237Bk

237.05700 (24)

 

1

m

53,100 (220)

7,527 (1)

B+ ?

 

238Bk

238.05828 (31)

 

2.4

m

54,290 (290)

7,524 (1)

B+~100

 

239Bk

239.05828 (25)

 

3

m

54,290 (230)

7,527 (1)

B+ ?

 

240Bk

240.05976 (16)

 

4.8

m

55,670 (150)

7,523 (1)

B+ ?

 

241Bk

241.06023 (22)

 

4.6

m

56,100 (200)

7,524 (1)

A ?

 

242Bk

242.06198 (22)

 

7

m

57,740 (200)

7,519 (1)

B+~100

 

243Bk

243.0630076 (51)

 

4.5

h

58,691.2 (4.7)

7,517.50 (2)

B+~100

 

244Bk

244.065181 (16)

 

4.35

h

60,716 (14)

7,511.47 (5.9)

B+ ?

 

245Bk

245.0663616 (25)

 

4.94

d

61,815.4 (2.3)

7,509.264 (9)

EC~100

 

246Bk

246.068673 (64)

 

1.8

d

63,968 (60)

7,502.8 (2.4)

B+~100

 

247Bk

247.0703071 (59)

 

1.38

ky

65,490.6 (5.5)

7,498.94 (2.2)

A~100

 

248Bk

248.073086 (76)

 

>9

y

68,080 (71)

7,491 (0)

A ?

 

249Bk

249.0749867 (28)

 

330

d

69,849.6 (2.6)

7,486.03 (1)

B-~100

 

250Bk

250.0783165 (43)

 

3.212

h

72,951.4 (4)

7,475.96 (1.6)

B-

100

251Bk

251.080760 (12)

 

55.6

m

75,228 (11)

7,469.26 (4.4)

B-

100

252Bk

252.08431 (22)

 

1.8

m

78,530 (200)

7,459 (1)

B-

?

253Bk

253.08688 (39)

 

10

m

80,930 (360)

7,451 (1)

B- ?

 

254Bk

254.09060 (32)

 

1

m

84,390 (300)

7,440 (1)

B- ?

242mBk

242.06198 (22)

 

600

ns

57,740 (200)

7,519 (1)

SF~100

 

248mBk

248.073086 (76)

 

23.7

h

68,080 (71)

7,491 (0)

B-

70 5

249mBk

249.0749867 (28)

 

300

us

69,849.6 (2.6)

7,486.03 (1)

IT

100

250mBk

250.0783165 (43)

 

29

us

72,951.4 (4)

7,475.96 (1.6)

IT

100

251mBk

251.080760 (12)

 

58

us

75,228 (11)

7,469.26 (4.4)

IT

100

250m1Bk

250.0783165 (43)

 

213

us

72,951.4 (4)

7,475.96 (1.6)

IT ?

 

237mBk

237.05700 (24)

 

 

 

53,100 (220)

7,527 (1)

0

 

238mBk

238.05828 (31)

 

 

 

54,290 (290)

7,524 (1)

0

 

239mBk

239.05828 (25)

 

 

 

54,290 (230)

7,527 (1)

0

 

240mBk

240.05976 (16)

 

 

 

55,670 (150)

7,523 (1)

0

 

241mBk

241.06023 (22)

 

 

 

56,100 (200)

7,524 (1)

0

 

242mBk

242.06198 (22)

 

 

 

57,740 (200)

7,519 (1)

0

 

243mBk

243.0630076 (51)

 

 

 

58,691.2 (4.7)

7,517.50 (2)

0

 

244mBk

244.065181 (16)

 

 

 

60,716 (14)

7,511.47 (5.9)

0

 

245mBk

245.0663616 (25)

 

 

 

61,815.4 (2.3)

7,509.264 (9)

0

 

248m1Bk

248.073086 (76)

 

 

 

68,080 (71)

7,491 (0)

0

 

Data Source: ENSDF March 2005

©Radiochemistry Society 2005