Radium Isotopic Data

 

 

 

Isotope

 

Isotopic Mass

amu

 

% Abundance

 

T1/2

 

T1/2

Units

 

Mass Excess

KeV

 

Binding Energy

Per Nucleon

KeV

 

Decay

Mode

 

Branching

Ratio

202Ra

202.009891 (67)

 

2.6

ms

9,213 (63)

7,684.9 (3.1)

A

100

203Ra

203.009272 (87)

 

4

ms

8,636 (81)

7,689.6 (4)

A~100

 

204Ra

204.006500 (17)

 

60

ms

6,054 (15)

7,704.16 (7.5)

A~100

 

205Ra

205.006269 (93)

 

220

ms

5,839 (86)

7,707.0 (4.2)

A

?

206Ra

206.003827 (19)

 

240

ms

3,565 (18)

7,719.81 (8.8)

A

100

207Ra

207.003798 (59)

 

1.3

s

3,538 (55)

7,721.6 (2.7)

A~90

 

208Ra

208.001840 (17)

 

1.3

s

1,714 (15)

7,732.08 (7.4)

A

?

209Ra

209.001991 (54)

 

4.6

s

1,855 (50)

7,733.0 (2.4)

A~90

 

210Ra

210.000495 (16)

 

3.7

s

461 (15)

7,741.28 (7.2)

A

?

211Ra

211.000898 (28)

 

13

s

836 (26)

7,741.1 (1.2)

A>93

 

212Ra

211.999794 (12)

 

13

s

-191 (11)

7,747.47 (5.3)

A

?

213Ra

213.000384 (22)

 

2.74

m

358 (20)

7,746.42 (9.5)

A

80 5

214Ra

214.0001079 (99)

 

2.46

s

100.5 (9.2)

7,749.14 (4.3)

A~100

 

215Ra

215.0027198 (82)

 

1.55

ms

2,533.5 (7.6)

7,739.32 (3.5)

A

100

216Ra

216.0035330 (94)

 

182

ns

3,291.0 (8.8)

7,737.35 (4.1)

A

100

217Ra

217.0063203 (92)

 

1.63

us

5,887.3 (8.5)

7,726.92 (3.9)

A

100

218Ra

218.007140 (12)

 

25.6

us

6,651 (11)

7,725.00 (5.1)

A

100

219Ra

219.0100851 (89)

 

10

ms

9,394.2 (8.3)

7,714.05 (3.8)

A

100

220Ra

220.0110284 (99)

 

17.9

ms

10,272.9 (9.2)

7,711.68 (4.2)

A

100

221Ra

221.0139173 (50)

 

28

s

12,963.9 (4.7)

7,701.13 (2.1)

A

222Ra

222.0153745 (49)

 

38

s

14,321.3 (4.6)

7,696.69 (2.1)

A

100

223Ra

223.0185022 (27)

 

11.43

d

17,234.7 (2.5)

7,685.30 (1.1)

A

100

224Ra

224.0202118 (24)

 

3.66

d

18,827.2 (2.2)

7,679.92 (1)

A

100

225Ra

225.0236116 (32)

 

14.9

d

21,994.0 (3)

7,667.58 (1.3)

B-

100

226Ra

226.0254098 (25)

 

1.6

ky

23,669.1 (2.3)

7,661.96 (1)

A

100

227Ra

227.0291778 (25)

 

42.2

m

27,179.0 (2.4)

7,648.30 (1)

B-

100

228Ra

228.0310703 (26)

 

5.75

y

28,941.8 (2.4)

7,642.42 (1.1)

B-

100

229Ra

229.034958 (20)

 

4

m

32,563 (19)

7,628.48 (8.2)

B-

100

230Ra

230.037056 (13)

 

93

m

34,518 (12)

7,621.91 (5.3)

B-

100

231Ra

231.04122 (32)

 

103

s

38,400 (300)

7,607 (1)

B-

100

232Ra

232.04364 (30)

 

250

s

40,650 (280)

7,599 (1)

B-

100

233Ra

233.04806 (50)

 

30

s

44,770 (470)

7,584 (2)

B-

100

234Ra

234.05070 (53)

 

30

s

47,230 (490)

7,575 (2)

B-

100

203mRa

203.009272 (87)

 

41

ms

8,636 (81)

7,689.6 (4)

A~100

 

205mRa

205.006269 (93)

 

180

ms

5,839 (86)

7,707.0 (4.2)

A

?

207mRa

207.003798 (59)

 

57

ms

3,538 (55)

7,721.6 (2.7)

IT

85#

208mRa

208.001840 (17)

 

270

ns

1,714 (15)

7,732.08 (7.4)

0

 

210mRa

210.000495 (16)

 

2.24

us

461 (15)

7,741.28 (7.2)

0

 

212mRa

211.999794 (12)

 

10.9

us

-191 (11)

7,747.47 (5.3)

IT

100

213mRa

213.000384 (22)

 

2.1

ms

358 (20)

7,746.42 (9.5)

IT~99

 

215mRa

215.0027198 (82)

 

7.1

us

2,533.5 (7.6)

7,739.32 (3.5)

IT

100

231mRa

231.04122 (32)

 

~53

us

38,400 (300)

7,607 (1)

IT

100

215m1Ra

215.0027198 (82)

 

1.39

us

2,533.5 (7.6)

7,739.32 (3.5)

IT

100

Data Source: ENSDF March 2005

©Radiochemistry Society 2005