Half-Lives for Several Radioactive Isotopes

Half-Lives for Several Radioactive Isotopes
$_{6}^{14} C$	5730 y	$(β^{−})$	$_{83}^{210} Bi$	5.01 d	$(β^{−})$
$_{7}^{13} N$	9.97 m	$(β^{+})$	$_{83}^{212} Bi$	60.55 m	$(α or β^{−})$
$_{9}^{15} F$	4.1 $\times$ 10⁻²² s	$(p)$	$_{84}^{210} Po$	138.4 d	$(α)$
$_{11}^{24} Na$	15.00 h	$(β^{−})$	$_{84}^{212} Po$	3 $\times$ 10⁻⁷ s	$(α)$
$_{15}^{32} P$	14.29 d	$(β^{−})$	$_{84}^{216} Po$	0.15 s	$(α)$
$_{19}^{40} K$	1.27 $\times$ 10⁹ y	$(β or E . C .)$	$_{84}^{218} Po$	3.05 m	$(α)$
$_{26}^{49} Fe$	0.08 s	$(β^{+})$	$_{85}^{215} At$	1.0 $\times$ 10⁻⁴ s	$(α)$
$_{26}^{60} Fe$	2.6 $\times$ 10⁶ y	$(β^{−})$	$_{85}^{218} At$	1.6 s	$(α)$
$_{27}^{60} Co$	5.27 y	$(β^{−})$	$_{86}^{220} Rn$	55.6 s	$(α)$
$_{37}^{87} Rb$	4.7 $\times$ 10¹⁰ y	$(β^{−})$	$_{86}^{222} Rn$	3.82 d	$(α)$
$_{38}^{90} Sr$	29 y	$(β^{−})$	$_{88}^{224} Ra$	3.66 d	$(α)$
$_{49}^{115} In$	5.1 $\times$ 10¹⁵ y	$(β^{−})$	$_{88}^{226} Ra$	1600 y	$(α)$
$_{53}^{131} I$	8.040 d	$(β^{−})$	$_{88}^{228} Ra$	5.75 y	$(β^{−})$
$_{58}^{142} Ce$	5 $\times$ 10¹⁵ y	$(α)$	$_{89}^{228} Ac$	6.13 h	$(β^{−})$
$_{81}^{208} Tl$	3.07 m	$(β^{−})$	$_{90}^{228} Th$	1.913 y	$(α)$
$_{82}^{210} Pb$	22.3 y	$(β^{−})$	$_{90}^{232} Th$	1.4 $\times$ 10¹⁰ y	$(α)$
$_{82}^{212} Pb$	10.6 h	$(β^{−})$	$_{90}^{233} Th$	22 m	$(β^{−})$
$_{82}^{214} Pb$	26.8 m	$(β^{−})$	$_{90}^{234} Th$	$24.10 d$	$(β^{−})$
$_{83}^{206} Bi$	6.243 d	$(E . C .)$	$_{91}^{233} Pa$	27 d	$(β^{−})$
$_{92}^{233} U$	1.59 $\times$ 10⁵ y	$(α)$	$_{96}^{242} Cm$	162.8 d	$(α)$
$_{92}^{234} U$	2.45 $\times$ 10⁵ y	$(α)$	$_{97}^{243} Bk$	4.5 h	$(α or E . C .)$
$_{92}^{235} U$	7.03 $\times$ 10⁸ y	$(α)$	$_{99}^{253} Es$	20.47 d	$(α)$
$_{92}^{238} U$	4.47 $\times$ 10⁹ y	$(α)$	$_{100}^{254} Fm$	3.24 h	$(α or S . F .)$
$_{92}^{239} U$	23.54 m	$(β^{−})$	$_{100}^{255} Fm$	20.1 h	$(α)$
$_{93}^{239} Np$	2.3 d	$(β^{−})$	$_{101}^{256} Md$	76 m	$(α or E . C .)$
$_{94}^{239} Pu$	2.407 $\times$ 10⁴ y	$(α)$	$_{102}^{254} No$	55 s	$(α)$
$_{94}^{239} Pu$	6.54 $\times$ 10³ y	$(α)$	$_{103}^{257} Lr$	0.65 s	$(α)$
$_{94}^{241} Pu$	14.4 y	$(α or β^{−})$	$_{105}^{260} Ha$	1.5 s	$(α or S . F .)$
$_{95}^{241} Am$	432.2 y	$(α)$	$_{106}^{263} Sg$	0.8 s	$(α or S . F .)$

Isotope

Half-Life¹

Type of Emission²

Isotope

Half-Life³

Type of Emission⁴

_{6}^{14} C

5730 y

(β^{−})

_{83}^{210} Bi

5.01 d

(β^{−})

_{7}^{13} N

9.97 m

(β^{+})

_{83}^{212} Bi

60.55 m

(α or β^{−})

_{9}^{15} F

4.1

\times

10⁻²² s

(p)

_{84}^{210} Po

138.4 d

(α)

_{11}^{24} Na

15.00 h

(β^{−})

_{84}^{212} Po

\times

10⁻⁷ s

(α)

_{15}^{32} P

14.29 d

(β^{−})

_{84}^{216} Po

0.15 s

(α)

_{19}^{40} K

1.27

\times

10⁹ y

(β or E . C .)

_{84}^{218} Po

3.05 m

(α)

_{26}^{49} Fe

0.08 s

(β^{+})

_{85}^{215} At

1.0

\times

10⁻⁴ s

(α)

_{26}^{60} Fe

2.6

\times

10⁶ y

(β^{−})

_{85}^{218} At

1.6 s

(α)

_{27}^{60} Co

5.27 y

(β^{−})

_{86}^{220} Rn

55.6 s

(α)

_{37}^{87} Rb

4.7

\times

10¹⁰ y

(β^{−})

_{86}^{222} Rn

3.82 d

(α)

_{38}^{90} Sr

29 y

(β^{−})

_{88}^{224} Ra

3.66 d

(α)

_{49}^{115} In

5.1

\times

10¹⁵ y

(β^{−})

_{88}^{226} Ra

1600 y

(α)

_{53}^{131} I

8.040 d

(β^{−})

_{88}^{228} Ra

5.75 y

(β^{−})

_{58}^{142} Ce

\times

10¹⁵ y

(α)

_{89}^{228} Ac

6.13 h

(β^{−})

_{81}^{208} Tl

3.07 m

(β^{−})

_{90}^{228} Th

1.913 y

(α)

_{82}^{210} Pb

22.3 y

(β^{−})

_{90}^{232} Th

1.4

\times

10¹⁰ y

(α)

_{82}^{212} Pb

10.6 h

(β^{−})

_{90}^{233} Th

22 m

(β^{−})

_{82}^{214} Pb

26.8 m

(β^{−})

_{90}^{234} Th

24.10 d

(β^{−})

_{83}^{206} Bi

6.243 d

(E . C .)

_{91}^{233} Pa

27 d

(β^{−})

_{92}^{233} U

1.59

\times

10⁵ y

(α)

_{96}^{242} Cm

162.8 d

(α)

_{92}^{234} U

2.45

\times

10⁵ y

(α)

_{97}^{243} Bk

4.5 h

(α or E . C .)

_{92}^{235} U

7.03

\times

10⁸ y

(α)

_{99}^{253} Es

20.47 d

(α)

_{92}^{238} U

4.47

\times

10⁹ y

(α)

_{100}^{254} Fm

3.24 h

(α or S . F .)

_{92}^{239} U

23.54 m

(β^{−})

_{100}^{255} Fm

20.1 h

(α)

_{93}^{239} Np

2.3 d

(β^{−})

_{101}^{256} Md

76 m

(α or E . C .)

_{94}^{239} Pu

2.407

\times

10⁴ y

(α)

_{102}^{254} No

55 s

(α)

_{94}^{239} Pu

6.54

\times

10³ y

(α)

_{103}^{257} Lr

0.65 s

(α)

_{94}^{241} Pu

14.4 y

(α or β^{−})

_{105}^{260} Ha

1.5 s

(α or S . F .)

_{95}^{241} Am

432.2 y

(α)

_{106}^{263} Sg

0.8 s

(α or S . F .)

Footnotes

1 y = years, d = days, h = hours, m = minutes, s = seconds
2 E.C. = electron capture, S.F. = Spontaneous fission
3 y = years, d = days, h = hours, m = minutes, s = seconds
4 E.C. = electron capture, S.F. = Spontaneous fission

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