Astatine Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

193At

192.999843 (58)

 

~40

ms

-146 (54)

7,727.5 (2.8)

A

100

194At

193.99873 (20)

 

~40

ms

-1,190 (190)

7,734.7 (9.6)

A~100

 

195At

194.9962681 (97)

 

328

ms

-3,476.2 (9.1)

7,748.12 (4.6)

A~100

 

196At

195.995788 (64)

 

253

ms

-3,923 (60)

7,752.1 (3.1)

A

?

197At

196.993189 (55)

 

350

ms

-6,344 (51)

7,766.0 (2.6)

A

96 4

198At

197.992837 (53)

 

4.2

s

-6,672 (49)

7,769.2 (2.5)

A>94

 

199At

198.990532 (54)

 

7.2

s

-8,819 (50)

7,781.5 (2.5)

A

89 6

200At

199.990351 (26)

 

43.2

s

-8,988 (24)

7,783.8 (1.2)

A

57 6

201At

200.9884170 (89)

 

85

s

-10,789.5 (8.3)

7,794.15 (4.1)

A

71 7

202At

201.988630 (30)

 

184

s

-10,591 (28)

7,794.5 (1.4)

B+

?

203At

202.986942 (13)

 

7.4

m

-12,163 (12)

7,803.65 (5.8)

B+

69 3

204At

203.987251 (26)

 

9.2

m

-11,875 (24)

7,803.6 (1.2)

B+

96.2 2

205At

204.986074 (16)

 

26.2

m

-12,972 (15)

7,810.21 (7.3)

B+

90 2

206At

205.986667 (22)

 

30.6

m

-12,420 (20)

7,808.79 (9.9)

B+

99.11 8

207At

206.985784 (23)

 

1.8

h

-13,243 (21)

7,814.0 (1)

B+

91.4 10

208At

207.986590 (28)

 

1.63

h

-12,491 (26)

7,811.7 (1.2)

B+

99.45 6

209At

208.9861731 (80)

 

5.41

h

-12,879.6 (7.5)

7,814.76 (3.6)

B+

95.9 5

210At

209.9871477 (84)

 

8.1

h

-11,971.8 (7.8)

7,811.66 (3.7)

B+~100

 

211At

210.9874963 (30)

 

7.214

h

-11,647.1 (2.8)

7,811.35 (1.3)

EC

58.20 8

212At

211.9907448 (77)

 

314

ms

-8,621.2 (7.2)

7,798.31 (3.4)

A~100

213At

212.9929366 (53)

 

125

ns

-6,579.5 (4.9)

7,790.00 (2.3)

A

100

214At

213.9963717 (46)

 

558

ns

-3,379.7 (4.3)

7,776.37 (2)

A

100

215At

214.9986526 (73)

 

100

us

-1,255.1 (6.8)

7,767.86 (3.2)

A

100

216At

216.0024233 (39)

 

300

us

2,257.3 (3.6)

7,753.00 (1.7)

A~100

 

217At

217.0047188 (53)

 

32.3

ms

4,395.6 (4.9)

7,744.61 (2.3)

A~100

 

218At

218.008694 (12)

 

1.5

s

8,099 (12)

7,729.12 (5.3)

A~100

 

219At

219.0111617 (42)

 

56

s

10,397.0 (3.9)

7,720.19 (1.8)

A~97

 

220At

220.015408 (55)

 

3.71

m

14,352 (51)

7,703.8 (2.3)

B-

92 2

221At

221.01805 (21)

 

2.3

m

16,810 (200)

7,694 (1)

B-

100

222At

222.02233 (32)

 

54

s

20,800 (300)

7,678 (1)

B-

100

223At

223.02519 (43)

 

50

s

23,460 (400)

7,668 (2)

B-~100

 

194mAt

193.99873 (20)

 

~250

ms

-1,190 (190)

7,734.7 (9.6)

A~100

 

195mAt

194.9962681 (97)

 

147

ms

-3,476.2 (9.1)

7,748.12 (4.6)

A

?

196mAt

195.995788 (64)

 

20

ms

-3,923 (60)

7,752.1 (3.1)

IT ?

 

197mAt

196.993189 (55)

 

3.7

s

-6,344 (51)

7,766.0 (2.6)

A~100

 

198mAt

197.992837 (53)

 

1

s

-6,672 (49)

7,769.2 (2.5)

A>86

 

200mAt

199.990351 (26)

 

47

s

-8,988 (24)

7,783.8 (1.2)

A

43 7

202mAt

201.988630 (30)

 

182

s

-10,591 (28)

7,794.5 (1.4)

IT ?

 

204mAt

203.987251 (26)

 

108

ms

-11,875 (24)

7,803.6 (1.2)

IT

100

205mAt

204.986074 (16)

 

67.9

ns

-12,972 (15)

7,810.21 (7.3)

0

 

206mAt

205.986667 (22)

 

410

ns

-12,420 (20)

7,808.79 (9.9)

IT

100

210mAt

209.9871477 (84)

 

482

us

-11,971.8 (7.8)

7,811.66 (3.7)

IT

100

212mAt

211.9907448 (77)

 

119

ms

-8,621.2 (7.2)

7,798.31 (3.4)

A>99

 

214mAt

213.9963717 (46)

 

268

ns

-3,379.7 (4.3)

7,776.37 (2)

0

 

216mAt

216.0024233 (39)

 

100

us

2,257.3 (3.6)

7,753.00 (1.7)

A

100

196m1At

195.995788 (64)

 

11

us

-3,923 (60)

7,752.1 (3.1)

IT ?

 

200m1At

199.990351 (26)

 

3.5

s

-8,988 (24)

7,783.8 (1.2)

IT~84

 

202m1At

201.988630 (30)

 

460

ms

-10,591 (28)

7,794.5 (1.4)

IT~100

 

205m1At

204.986074 (16)

 

7.8

us

-12,972 (15)

7,810.21 (7.3)

0

 

210m1At

209.9871477 (84)

 

5.66

us

-11,971.8 (7.8)

7,811.66 (3.7)

IT

100

212m1At

211.9907448 (77)

 

152

us

-8,621.2 (7.2)

7,798.31 (3.4)

IT

100

214m1At

213.9963717 (46)

 

760

ns

-3,379.7 (4.3)

7,776.37 (2)

0

 

210m2At

209.9871477 (84)

 

98

ns

-11,971.8 (7.8)

7,811.66 (3.7)

IT

100

Data Source: ENSDF March 2005

©Radiochemistry Society 2005