Appendix M – Half-Lives for Several Radioactive Isotopes

Isotope

Half-Life^[1]

Type of Emission^[2]

Isotope

Half-Life^[3]

Type of Emission^[4]

$\begin{array}{c}14\\ 6\end{array}$ C

5730 y

(β−)

$\begin{array}{c}210\\ 83\end{array}$ Bi

5.01 d

(β−)

$\begin{array}{c}13\\ 7\end{array}$ N

9.97 m

(β+)

$\begin{array}{c}212\\ 83\end{array}$ Bi

60.55 m

(α or β−)

$\begin{array}{c}15\\ 9\end{array}$ F

4.1 × 10⁻²² s

(p)

138.4 d

(α)

$\begin{array}{c}24\\ 11\end{array}$ Na

15.00 h

(β−)

3 × 10⁻⁷ s

(α)

$\begin{array}{c}32\\ 15\end{array}$ P

14.29 d

(β−)

$\begin{array}{c}218\\ 84\end{array}$ Po

0.15 s

(α)

$\begin{array}{c}40\\ 19\end{array}$ K

1.27 × 10⁹ y

(β or E.C.)

$\begin{array}{c}215\\ 84\end{array}$ At

3.05 m

(α)

$\begin{array}{c}49\\ 26\end{array}$ Fe

0.08 s

(β+)

$\begin{array}{c}218\\ 85\end{array}$ At

1.0 × 10⁻⁴ s

(α)

$\begin{array}{c}60\\ 26\end{array}$ Fe

2.6 × 10⁶ y

(β−)

$\begin{array}{c}220\\ 85\end{array}$ Rn

1.6 s

(α)

$\begin{array}{c}60\\ 27\end{array}$ Co

5.27 y

(β−)

$\begin{array}{c}222\\ 86\end{array}$ Rn

55.6 s

(α)

$\begin{array}{c}87\\ 37\end{array}$ Rb

4.7 × 10¹⁰ y

(β−)

$\begin{array}{c}224\\ 86\end{array}$ Rn

3.82 d

(α)

$\begin{array}{c}90\\ 38\end{array}$ Sr

29 y

(β−)

$\begin{array}{c}226\\ 88\end{array}$ Ra

3.66 d

(α)

$\begin{array}{c}115\\ 49\end{array}$ In

5.1 × 10¹⁵ y

(β−)

$\begin{array}{c}228\\ 88\end{array}$ Na

1600 y

(α)

$\begin{array}{c}131\\ 53\end{array}$ I

8.040 d

(β−)

$\begin{array}{c}228\\ 88\end{array}$ Ra

5.75 y

(β−)

$\begin{array}{c}142\\ 58\end{array}$ Ce

5 × 10¹⁵ y

(α)

$\begin{array}{c}228\\ 89\end{array}$ Ac

6.13 h

(β−)

$\begin{array}{c}208\\ 81\end{array}$ Tl

3.07 m

(β−)

$\begin{array}{c}232\\ 90\end{array}$ Th

1.913 y

(α)

$\begin{array}{c}210\\ 82\end{array}$ Pb

22.3 y

(β−)

$\begin{array}{c}233\\ 90\end{array}$ Th

1.4 × 10¹⁰ y

(α)

$\begin{array}{c}212\\ 82\end{array}$Pb

10.6 h

(β−)

$\begin{array}{c}234\\ 90\end{array}$ Th

22 m

(β−)

$\begin{array}{c}214\\ 82\end{array}$ Pb

26.8 m

(β−)

$\begin{array}{c}233\\ 90\end{array}$ Th

24.10 d

(β−)

$\begin{array}{c}206\\ 83\end{array}$ Bi

6.243 d

(E.C.)

$\begin{array}{c}242\\ 91\end{array}$ Pa

27 d

(β−)

$\begin{array}{c}233\\ 92\end{array}$ U

1.59 × 10⁵ y

(α)

$\begin{array}{c}243\\ 96\end{array}$ Cm

162.8 d

(α)

$\begin{array}{c}234\\ 92\end{array}$ U

2.45 × 10⁵ y

(α)

$\begin{array}{c}253\\ 97\end{array}$ Bk

4.5 h

(α or E.C.)

$\begin{array}{c}235\\ 92\end{array}$ U

7.03 × 10⁸ y

(α)

$\begin{array}{c}254\\ 99\end{array}$ Es

20.47 d

(α)

$\begin{array}{c}238\\ 92\end{array}$U

4.47 × 10⁹ y

(α)

$\begin{array}{c}255\\ 100\end{array}$ Fm

3.24 h

(α or S.F.)

$\begin{array}{c}239\\ 92\end{array}$ U

23.54 m

(β−)

$\begin{array}{c}256\\ 100\end{array}$ Fm

20.1 h

(α)

$\begin{array}{c}239\\ 93\end{array}$ Np

2.3 d

(β−)

$\begin{array}{c}254\\ 101\end{array}$ Md

76 m

(α or E.C.)

$\begin{array}{c}239\\ 94\end{array}$Pu

2.407 × 10⁴ y

(α)

$\begin{array}{c}254\\ 102\end{array}$ No

55 s

(α)

$\begin{array}{c}239\\ 94\end{array}$Pu

6.54 × 10³ y

(α)

$\begin{array}{c}257\\ 103\end{array}$ Lr

0.65 s

(α)

$\begin{array}{c}241\\ 94\end{array}$ Pu

14.4 y

(α or β−)

$\begin{array}{c}260\\ 105\end{array}$ Ha

1.5 s

(α or S.F.)

432.2 y

(α)

$\begin{array}{c}263\\ 106\end{array}$ Sg

0.8 s

(α or S.F.)