Isotope

Isotopic Mass

amu

% Abundance

T_1/2

T_1/2

Units

Mass Excess

KeV

Binding Energy

Per Nucleon

KeV

Decay

Mode

Branching

Ratio

²⁰⁹Th

209.01772 (11)

7

ms

16,500 (100)

7,655.5 (4.8)

A

?

²¹⁰Th

210.015075 (27)

17

ms

14,043 (25)

7,669.2 (1.2)

A

?

²¹¹Th

211.014928 (80)

48

ms

13,906 (75)

7,671.7 (3.5)

A

?

²¹²Th

212.012980 (20)

36

ms

12,091 (18)

7,682.16 (8.7)

A~100

²¹³Th

213.013010 (76)

140

ms

12,119 (71)

7,683.9 (3.3)

A

?

²¹⁴Th

214.011500 (18)

100

ms

10,712 (17)

7,692.24 (7.9)

A~100

²¹⁵Th

215.011730 (29)

1.2

s

10,927 (27)

7,693.0 (1.2)

A

100

²¹⁶Th

216.011062 (14)

26.8

ms

10,304 (13)

7,697.63 (6)

A~100

²¹⁷Th

217.013114 (22)

240

us

12,216 (21)

7,690.55 (9.6)

A

100

²¹⁸Th

218.013284 (14)

109

ns

12,374 (13)

7,691.57 (5.9)

A

100

²¹⁹Th

219.015537 (54)

1.05

us

14,473 (51)

7,683.7 (2.3)

A

100

²²⁰Th

220.015748 (24)

9.7

us

14,669 (22)

7,684.6 (1)

A

100

²²¹Th

221.018184 (10)

1.68

ms

16,938.0 (9.4)

7,676.07 (4.2)

A

100

²²²Th

222.018468 (13)

2.05

ms

17,203 (12)

7,676.66 (5.5)

A

100

²²³Th

223.0208114 (99)

600

ms

19,385.7 (9.2)

7,668.64 (4.1)

A

100

²²⁴Th

224.021467 (12)

1.05

s

19,996 (11)

7,667.71 (4.9)

A

100

²²⁵Th

225.0239510 (55)

8.72

m

22,310.2 (5.1)

7,659.22 (2.3)

A~90

²²⁶Th

226.0249031 (51)

30.57

m

23,197.1 (4.7)

7,657.12 (2.1)

A

100

²²⁷Th

227.0277041 (27)

18.68

d

25,806.2 (2.5)

7,647.45 (1.1)

A

100

²²⁸Th

228.0287411 (24)

1.9116

y

26,772.2 (2.2)

7,645.07 (1)

A

²²⁹Th

229.0317624 (30)

7.34

ky

29,586.5 (2.8)

7,634.65 (1.2)

A

100

²³⁰Th

230.0331338 (19)

75.38

ky

30,864.0 (1.8)

7,630.990 (8)

A

100

²³¹Th

231.0363043 (19)

25.52

h

33,817.3 (1.8)

7,620.112 (8)

B-

100

²³²Th

232.0380553 (21)

100

14.05

Gy

35,448.3 (2)

7,615.026 (9)

²³³Th

233.0415818 (21)

22.3

m

38,733.2 (2)

7,602.886 (9)

B-

100

²³⁴Th

234.0436012 (38)

24.1

d

40,614.3 (3.5)

7,596.85 (1.5)

B-

100

²³⁵Th

235.047510 (54)

7.2

m

44,255 (50)

7,583.4 (2.1)

B-

100

²³⁶Th

236.04987 (21)

37.5

m

46,450 (200)

7,576 (1)

B-

100

²³⁷Th

237.05389 (39)

4.8

m

50,200 (360)

7,562 (2)

B-

100

²³⁸Th

238.05650 (30)

9.4

m

52,630 (280)

7,554 (1)

B-

100

^216mTh

216.011062 (14)

137

us

10,304 (13)

7,697.63 (6)

IT

94 4

^229mTh

229.0317624 (30)

70

h

29,586.5 (2.8)

7,634.65 (1.2)

IT ?

^216m1Th

216.011062 (14)

615

ns

10,304 (13)

7,697.63 (6)

IT

100