Appendix M – Half-Lives for Several Radioactive Isotopes

Isotope

Half-Life^[1]

Type of Emission^[2]

Isotope

Half-Life^[3]

Type of Emission^[4]

[latex]\small{\begin{array}{c} 14\\6 \end{array}}[/latex] C

5730 y

(β−)

[latex]\small{\begin{array}{c} 210\\83 \end{array}}[/latex] Bi

5.01 d

(β−)

[latex]\small{\begin{array}{c} 13\\7 \end{array}}[/latex] N

9.97 m

(β+)

[latex]\small{\begin{array}{c} 212\\83 \end{array}}[/latex] Bi

60.55 m

(α or β−)

[latex]\small{\begin{array}{c} 15\\9 \end{array}}[/latex] F

4.1 × 10⁻²² s

(p)

138.4 d

(α)

[latex]\small{\begin{array}{c} 24\\11 \end{array}}[/latex] Na

15.00 h

(β−)

3 × 10⁻⁷ s

(α)

[latex]\small{\begin{array}{c} 32\\15 \end{array}}[/latex] P

14.29 d

(β−)

[latex]\small{\begin{array}{c} 218\\84 \end{array}}[/latex] Po

0.15 s

(α)

[latex]\small{\begin{array}{c} 40\\19 \end{array}}[/latex] K

1.27 × 10⁹ y

(β or E.C.)

[latex]\small{\begin{array}{c} 215\\84 \end{array}}[/latex] At

3.05 m

(α)

[latex]\small{\begin{array}{c} 49\\26 \end{array}}[/latex] Fe

0.08 s

(β+)

[latex]\small{\begin{array}{c} 218\\85 \end{array}}[/latex] At

1.0 × 10⁻⁴ s

(α)

[latex]\small{\begin{array}{c} 60\\26 \end{array}}[/latex] Fe

2.6 × 10⁶ y

(β−)

[latex]\small{\begin{array}{c} 220\\85 \end{array}}[/latex] Rn

1.6 s

(α)

[latex]\small{\begin{array}{c} 60\\27 \end{array}}[/latex] Co

5.27 y

(β−)

[latex]\small{\begin{array}{c} 222\\86 \end{array}}[/latex] Rn

55.6 s

(α)

[latex]\small{\begin{array}{c} 87\\37 \end{array}}[/latex] Rb

4.7 × 10¹⁰ y

(β−)

[latex]\small{\begin{array}{c} 224\\86 \end{array}}[/latex] Rn

3.82 d

(α)

[latex]\small{\begin{array}{c} 90\\38 \end{array}}[/latex] Sr

29 y

(β−)

[latex]\small{\begin{array}{c} 226\\88 \end{array}}[/latex] Ra

3.66 d

(α)

[latex]\small{\begin{array}{c} 115\\49 \end{array}}[/latex] In

5.1 × 10¹⁵ y

(β−)

[latex]\small{\begin{array}{c} 228\\88 \end{array}}[/latex] Na

1600 y

(α)

[latex]\small{\begin{array}{c} 131\\53 \end{array}}[/latex] I

8.040 d

(β−)

[latex]\small{\begin{array}{c} 228\\88 \end{array}}[/latex] Ra

5.75 y

(β−)

[latex]\small{\begin{array}{c} 142\\58 \end{array}}[/latex] Ce

5 × 10¹⁵ y

(α)

[latex]\small{\begin{array}{c} 228\\89 \end{array}}[/latex] Ac

6.13 h

(β−)

[latex]\small{\begin{array}{c} 208\\81 \end{array}}[/latex] Tl

3.07 m

(β−)

[latex]\small{\begin{array}{c} 232\\90 \end{array}}[/latex] Th

1.913 y

(α)

[latex]\small{\begin{array}{c} 210\\82 \end{array}}[/latex] Pb

22.3 y

(β−)

[latex]\small{\begin{array}{c} 233\\90 \end{array}}[/latex] Th

1.4 × 10¹⁰ y

(α)

[latex]\small{\begin{array}{c} 212\\82 \end{array}}[/latex]Pb

10.6 h

(β−)

[latex]\small{\begin{array}{c} 234\\90 \end{array}}[/latex] Th

22 m

(β−)

[latex]\small{\begin{array}{c} 214\\82 \end{array}}[/latex] Pb

26.8 m

(β−)

[latex]\small{\begin{array}{c} 233\\90 \end{array}}[/latex] Th

24.10 d

(β−)

[latex]\small{\begin{array}{c} 206\\83 \end{array}}[/latex] Bi

6.243 d

(E.C.)

[latex]\small{\begin{array}{c} 242\\91 \end{array}}[/latex] Pa

27 d

(β−)

[latex]\small{\begin{array}{c} 233\\92 \end{array}}[/latex] U

1.59 × 10⁵ y

(α)

[latex]\small{\begin{array}{c} 243\\96 \end{array}}[/latex] Cm

162.8 d

(α)

[latex]\small{\begin{array}{c} 234\\92 \end{array}}[/latex] U

2.45 × 10⁵ y

(α)

[latex]\small{\begin{array}{c} 253\\97 \end{array}}[/latex] Bk

4.5 h

(α or E.C.)

[latex]\small{\begin{array}{c} 235\\92 \end{array}}[/latex] U

7.03 × 10⁸ y

(α)

[latex]\small{\begin{array}{c} 254\\99 \end{array}}[/latex] Es

20.47 d

(α)

[latex]\small{\begin{array}{c} 238\\92 \end{array}}[/latex]U

4.47 × 10⁹ y

(α)

[latex]\small{\begin{array}{c} 255\\100 \end{array}}[/latex] Fm

3.24 h

(α or S.F.)

[latex]\small{\begin{array}{c} 239\\92 \end{array}}[/latex] U

23.54 m

(β−)

[latex]\small{\begin{array}{c} 256\\100 \end{array}}[/latex] Fm

20.1 h

(α)

[latex]\small{\begin{array}{c} 239\\93 \end{array}}[/latex] Np

2.3 d

(β−)

[latex]\small{\begin{array}{c} 254\\101 \end{array}}[/latex] Md

76 m

(α or E.C.)

[latex]\small{\begin{array}{c} 239\\94 \end{array}}[/latex]Pu

2.407 × 10⁴ y

(α)

[latex]\small{\begin{array}{c} 254\\102 \end{array}}[/latex] No

55 s

(α)

[latex]\small{\begin{array}{c} 239\\94 \end{array}}[/latex]Pu

6.54 × 10³ y

(α)

[latex]\small{\begin{array}{c} 257\\103 \end{array}}[/latex] Lr

0.65 s

(α)

[latex]\small{\begin{array}{c} 241\\94 \end{array}}[/latex] Pu

14.4 y

(α or β−)

[latex]\small{\begin{array}{c} 260\\105 \end{array}}[/latex] Ha

1.5 s

(α or S.F.)

432.2 y

(α)

[latex]\small{\begin{array}{c} 263\\106 \end{array}}[/latex] Sg

0.8 s

(α or S.F.)