Curium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

233Cm

233.050771 (77)

 

1

m

47,293 (72)

7,546.0 (3.1)

A

?

234Cm

234.050160 (20)

 

51

s

46,724 (18)

7,550.68 (7.8)

A

?

235Cm

235.05143 (22)

 

5

m

47,910 (200)

7,548 (1)

B+ ?

 

236Cm

236.05141 (22)

 

10

m

47,890 (200)

7,550 (1)

B+ ?

 

237Cm

237.05290 (22)

 

20

m

49,280 (210)

7,546 (1)

B+ ?

 

238Cm

238.053029 (39)

 

2.4

h

49,396 (37)

7,548.2 (1.5)

EC ?

 

239Cm

239.05496 (11)

 

~2.9

h

51,190 (100)

7,543 (0)

B+~100

 

240Cm

240.0555295 (25)

 

27

d

51,725.4 (2.3)

7,542.86 (1)

A~100

 

241Cm

241.0576530 (23)

 

32.8

d

53,703.4 (2.2)

7,536.841 (9)

EC

99.0 1

242Cm

242.0588358 (20)

 

162.8

d

54,805.2 (1.8)

7,534.497 (8)

A

100

243Cm

243.0613891 (22)

 

29.1

y

57,183.6 (2.1)

7,526.918 (9)

A~100

 

244Cm

244.0627526 (20)

 

18.1

y

58,453.7 (1.8)

7,523.944 (7)

A

100

245Cm

245.0654912 (22)

 

8.5

ky

61,004.7 (2.1)

7,515.766 (8)

A

100

246Cm

246.0672237 (22)

 

4.76

ky

62,618.4 (2.1)

7,511.465 (8)

A~100

 

247Cm

247.0703535 (47)

 

15.6

My

65,533.9 (4.4)

7,501.93 (1.8)

A

100

248Cm

248.0723485 (54)

 

348

ky

67,392.2 (5.1)

7,496.73 (2)

A

91.61 16

249Cm

249.0759534 (54)

 

64.15

m

70,750.2 (5.1)

7,485.55 (2)

B-

100

250Cm

250.078357 (12)

 

8300

y

72,989 (11)

7,478.94 (4.5)

SF~74

 

251Cm

251.082285 (24)

 

16.8

m

76,648 (23)

7,466.72 (9.1)

B-

100

252Cm

252.08487 (32)

 

<1

d

79,060 (300)

7,460 (1)

B- ?

244mCm

244.0627526 (20)

 

34

ms

58,453.7 (1.8)

7,523.944 (7)

IT

100

245mCm

245.0654912 (22)

 

290

ns

61,004.7 (2.1)

7,515.766 (8)

IT

100

249mCm

249.0759534 (54)

 

23

us

70,750.2 (5.1)

7,485.55 (2)

A

100

235mCm

235.05143 (22)

 

 

 

47,910 (200)

7,548 (1)

0

 

237mCm

237.05290 (22)

 

 

 

49,280 (210)

7,546 (1)

0

 

239mCm

239.05496 (11)

 

 

 

51,190 (100)

7,543 (0)

0

 

243mCm

243.0613891 (22)

 

 

 

57,183.6 (2.1)

7,526.918 (9)

0

 

Data Source: ENSDF March 2005

©Radiochemistry Society 2005