Isotope

Isotopic Mass

amu

% Abundance

T_1/2

T_1/2

Units

Mass Excess

KeV

Binding Energy

Per Nucleon

KeV

Decay

Mode

Branching

Ratio

²³¹Am

231.04556 (32)

30

s

42,440 (300)

7,566 (1)

B+ ?

²³²Am

232.04659 (32)

1.31

m

43,400 (300)

7,564 (1)

B+

?

²³³Am

233.04635 (11)

3.2

m

43,170 (100)

7,567 (0)

B+ ?

²³⁴Am

234.04781 (22)

2.32

m

44,530 (210)

7,563 (1)

B+~100

²³⁵Am

235.04795 (13)

9.9

m

44,660 (120)

7,565 (1)

B+~100

²³⁶Am

236.04958 (11)

30

m

46,180 (100)

7,561 (0)

B+ ?

²³⁷Am

237.049996 (64)

73

m

46,571 (59)

7,561 (0)

B+~100

²³⁸Am

238.051984 (54)

98

m

48,423 (51)

7,555.6 (2.1)

B+

100

²³⁹Am

239.0530245 (26)

11.9

h

49,392.0 (2.4)

7,553.68 (1)

EC~100

²⁴⁰Am

240.055300 (15)

50.8

h

51,512 (14)

7,547.01 (5.8)

B+

100

²⁴¹Am

241.0568291 (20)

432.2

y

52,936.0 (1.8)

7,543.272 (8)

A

100

²⁴²Am

242.0595492 (20)

16.02

h

55,469.7 (1.8)

7,534.984 (8)

B-

82.7 3

²⁴³Am

243.0613811 (25)

7.37

ky

57,176.1 (2.3)

7,530.169 (9)

A

100

²⁴⁴Am

244.0642848 (22)

10.1

h

59,881.0 (2.1)

7,521.301 (9)

B-

100

²⁴⁵Am

245.0664521 (37)

2.05

h

61,899.7 (3.5)

7,515.31 (1.4)

B-

100

²⁴⁶Am

246.069775 (20)

39

m

64,995 (18)

7,504.99 (7.4)

B-

100

²⁴⁷Am

247.07209 (11)

23

m

67,150 (100)

7,499 (0)

B-

100

²⁴⁸Am

248.07575 (22)

3

m

70,560 (200)

7,487 (1)

B- ?

²⁴⁹Am

249.07848 (32)

1

m

73,100 (300)

7,479 (1)

B- ?

^238mAm

238.051984 (54)

35

us

48,423 (51)

7,555.6 (2.1)

SF~100

^239mAm

239.0530245 (26)

163

ns

49,392.0 (2.4)

7,553.68 (1)

SF~100

^241mAm

241.0568291 (20)

1.5

us

52,936.0 (1.8)

7,543.272 (8)

0

^242mAm

242.0595492 (20)

141

y

55,469.7 (1.8)

7,534.984 (8)

IT~100

^244mAm

244.0642848 (22)

26

m

59,881.0 (2.1)

7,521.301 (9)

B-~100

^246mAm

246.069775 (20)

25

m

64,995 (18)

7,504.99 (7.4)

B-~100

^242m1Am

242.0595492 (20)

14

ms

55,469.7 (1.8)

7,534.984 (8)

SF~100