Argon Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

30Ar

30.02156 (32)

 

<20

ns

20,080 (300)

6,930 (10)

2p ?

 

31Ar

31.01212 (22)

 

14.4

ms

11,290 (210)

7,253 (7)

B+

100

32Ar

31.9976380 (19)

 

98

ms

-2,200.2 (1.8)

7,700.00 (5.6)

B+

100

33Ar

32.98992571 (48)

 

173

ms

-9,384.14 (44)

7,928.95 (1.3)

B+

100

34Ar

33.98027124 (41)

 

845

ms

-18,377.22 (39)

8,197.64 (1.1)

B+

100

35Ar

34.97525759 (80)

 

1.775

s

-23,047.41 (75)

8,327.47 (2.1)

B+

100

36Ar

35.967545105 (28)

0.3365 (30)

stable

 

-30,231.540 (27)

8,519.909 (1)

 

 

37Ar

36.96677632 (22)

 

35.04

d

-30,947.66 (20)

8,527.139 (6)

EC

100

38Ar

37.96273239 (36)

0.0632 (5)

stable

 

-34,714.55 (34)

8,614.273 (9)

 

 

39Ar

38.9643132 (54)

 

269

y

-33,242.0 (5)

8,562.6 (1.3)

B-

100

40Ar

39.9623831225 (29)

99.6003 (30)

stable

 

-35,039.8960 (27)

8,595 (0)

 

 

41Ar

40.96450061 (36)

 

109.61

m

-33,067.47 (33)

8,534.371 (8)

B-

100

42Ar

41.9630457 (62)

 

32.9

y

-34,422.7 (5.8)

8,555.6 (1.4)

B-

100

43Ar

42.9656361 (57)

 

5.37

m

-32,009.8 (5.3)

8,488.2 (1.2)

B-

100

44Ar

43.9649240 (17)

 

11.87

m

-32,673.1 (1.6)

8,493.84 (3.6)

B-

100

45Ar

44.96803996 (59)

 

21.48

s

-29,770.59 (55)

8,419.95 (1.2)

B-

100

46Ar

45.968094 (44)

 

8.4

s

-29,720 (41)

8,411.3 (8.9)

B-

100

47Ar

46.97219 (11)

 

580

ms

-25,910 (100)

8,323 (2.1)

B-

100

48Ar

47.97454 (32)

 

500

ms

-23,720 (300)

8,272 (6)

B- ?

 

49Ar

48.98052 (54)

 

170

ms

-18,150 (500)

8,150 (10)

B-

100

50Ar

49.98443 (75)

 

85

ms

-14,500 (700)

8,080 (14)

B-

100

51Ar

50.99163 (75)

 

60

ms

-7,800 (700)

7,950 (14)

B- ?

 

52Ar

51.99678 (97)

 

10

ms

-3,000 (900)

7,860 (17)

B- ?

 

53Ar

53.0049 (11)

 

3

ms

4,600 (1000)

7,720 (19)

B- ?

 

32mAr

31.9976380 (19)

 

 

 

-2,200.2 (1.8)

7,700.00 (5.6)

IT ?

 

 

Data Source: ENSDF March 2005

©Radiochemistry Society 2005