List of radioactive isotopes by half-life

This is a list of radioactive isotopes ordered by half-life from shortest to longest.

## Contents

* 1 10−24 seconds (yoctoseconds)
* 2 10−21 seconds (zeptoseconds)
* 3 10−18 seconds (attoseconds)
* 4 10−15 seconds (femtoseconds)
* 5 10−12 seconds (picoseconds)
* 6 10−9 seconds (nanoseconds)
* 7 10−6 seconds (microseconds)
* 8 10−3 seconds (milliseconds)
* 9 100 seconds
* 10 103 seconds (kiloseconds)
* 11 106 seconds (megaseconds)
* 12 109 seconds (gigaseconds)
* 13 1012 seconds (teraseconds)
* 14 1015 seconds (petaseconds)
* 15 1018 seconds (exaseconds)
* 16 1021 seconds (zettaseconds)
* 17 1024 seconds (yottaseconds)
* 18 1027 seconds (xonaseconds)
* 19 1030 seconds (wecaseconds)
* 20 See also
* 21 Notes
* 22 External links

## 10−24 seconds (yoctoseconds)

isotope  | half-life
10−24 seconds

|

hydrogen-7 | 23
hydrogen-5 | 80
hydrogen-4 | 139
nitrogen-10 | 200
hydrogen-6 | 290
lithium-5 | 324
lithium-4 | 325
boron-7 | 350
oxygen-12 | 580
nitrogen-11 | 590
nitrogen-11m | 690
helium-5 | 760

## 10−21 seconds (zeptoseconds)

isotope  | half-life
10−21 seconds

|

sodium-18 | 1.34
helium-10 | 1.52
lithium-10 | 2
carbon-8 | 2
helium-7 | 3.040
beryllium-6 | 5
helium-9 | 7
boron-9 | 80

## 10−18 seconds (attoseconds)

isotope  | half-life
10−18 seconds

|

beryllium-8 | 81.9

## 10−15 seconds (femtoseconds)

## 10−12 seconds (picoseconds)

isotope  | half-life
10−12 seconds

|

boron-16 | 190
beryllium-13 | 500

## 10−9 seconds (nanoseconds)

isotope  | half-life
10−9 seconds

|

lithium-12 | 10
boron-18 | 26
carbon-21 | 30
beryllium-15 | 200
beryllium-16 | 200
polonium-212 | 299

## 10−6 seconds (microseconds)

isotope  | half-life
10−6 seconds

|

darmstadtium-267 | 3
nobelium-250 | 5.7
rutherfordium-254 | 23
darmstadtium-270 | 160
polonium-214 | 164
darmstadtium-273 | 170
darmstadtium-269 | 230
copernicium-277 | 240
nihonium-278 | 340
fermium-258 | 370
hassium-264 | 540
fermium-241  | 730
hassium-263 | 760
fermium-242 | 800
oganesson-294 | 890

## 10−3 seconds (milliseconds)

isotope  | half-life
10−3 seconds

|

hassium-265 | 2
boron-19 | 2.92
meitnerium-266 | 3.4
boron-17 | 5.08
carbon-22 | 6.2
oxygen-13 | 8.58
lithium-11 | 8.59
boron-15 | 9.87
nitrogen-12 | 11
boron-14 | 12.5
nitrogen-22 | 13.9
nitrogen-23 | 14.5
carbon-20 | 16
boron-13 | 17.33
boron-12 | 20.2
beryllium-12 | 21.49
carbon-19 | 46.2
oxygen-24 | 65
oxygen-23 | 82
nitrogen-21 | 87
carbon-18 | 92
bohrium-262 | 102
helium-8 | 119
carbon-9 | 126.5
nitrogen-20 | 130
lithium-9 | 178.3
nitrogen-19 | 271
carbon-17 | 193
nitrogen-18 | 622
carbon-16 | 747
boron-8 | 770
helium-6 | 806.7
lithium-8 | 839.9

## 100 seconds

isotope  | half-life
seconds

|

oxygen-22 | 2.25
carbon-15 | 2.449
flerovium-289 | 2.6
oxygen-21 | 3.42
Nitrogen-17 | 4.173
beryllium-14 | 4.84
Nitrogen-16 | 7.13
oxygen-20 | 13.51
beryllium-11 | 13.81
carbon-10 | 19.29
oxygen-19 | 26.464
dubnium-261 | 27
seaborgium-266 | 30
dubnium-262 | 34
| minutes  | seconds
oxygen-14 | 1.17663  | 70.598
rutherfordium-261 | 1.35  | 81
nobelium-253 | 1.62  | 97
oxygen-15 | 2.0373  | 122.24
nitrogen-13 | 9.965  | 597.9

## 103 seconds (kiloseconds)

isotope  | half-life

|

minutes  | 103 seconds
carbon-11 | 20.334  | 1.2200
nobelium-259 | 58  | 3.5
| hours  | 103 seconds
fluorine-18 | 1.8295  | 6.586
mendelevium-257 | 5.52  | 19.9
erbium-165 | 10.36  | 37.3
sodium-24 | 14.96  | 53.9
| days  | 103 seconds
fermium-252 | 1.058  | 91.4
erbium-160 | 1.191  | 102.9
gold-198 | 2.695  | 232.8
neptunium-239 | 2.356  | 203.6
fermium-253 | 3  | 260
gold-199 | 3.169  | 273.8
radon-222 | 3.8235  | 330.35
calcium-47 | 4.536  | 391.9
manganese-52 | 5.591  | 483.1
gold-196 | 6.183  | 534.2
iodine-131 | 8.02  | 693
thulium-167 | 9.25  | 799

## 106 seconds (megaseconds)

isotope  | half-life

|

days  | 106 seconds
phosphorus-32 | 14.29  | 1.235
vanadium-48 | 15.9735  | 1.38011
californium-253 | 17.81  | 1.539
chromium-51 | 27.7025  | 2.39350
mendelevium-258 | 51.5  | 4.45
beryllium-7 | 53.12  | 4.590
californium-254 | 60.5  | 5.23
cobalt-56 | 77.27  | 6.676
scandium-46 | 83.79  | 7.239
sulfur-35 | 87.32  | 7.544
thulium-168 | 93.1  | 8.04
fermium-257 | 100.5  | 8.68
thulium-170 | 128.6  | 11.11
polonium-210 | 138  | 11.9
calcium-45 | 162.7  | 14.06
gold-195 | 186.1  | 16.08
zinc-65 | 243.7  | 21.06
cobalt-57 | 271.79  | 23.483
vanadium-49 | 330  | 29
californium-248 | 333.5  | 28.81
| years  | 106 seconds
ruthenium-106 | 1.023  | 32.3
neptunium-235 | 1.084  | 34.2
cadmium-109 | 1.267  | 40.0
thulium-171 | 1.92  | 61
caesium-134 | 2.0652  | 65.17
sodium-22 | 2.602  | 82.1
iron-55 | 2.737  | 86.4
rhodium-101 | 3.3  | 100
cobalt-60 | 5.2714  | 166.35
krypton-85 | 10.756  | 339.4
hydrogen-3 | 12.32  | 389
californium-250 | 13.08  | 413
niobium
meta state Nb-93m | 16.13  | 509
strontium-90 | 28.79  | 909
curium-243 | 29.1  | 920
caesium-137 | 30.17  | 952

## 109 seconds (gigaseconds)

isotope  | half-life

|

years  | 109 seconds
titanium-44 | 63  | 2.0
uranium-232 | 68.9  | 2.17
plutonium-238 | 87.7  | 2.77
samarium-151 | 96.6  | 3.05
nickel-63 | 100.1  | 3.16
silicon-32 | 170  | 5.4
argon-39 | 269  | 8.5
californium-249 | 351  | 11.1
silver-108 | 418  | 13.2
americium-241 | 432.2  | 13.64
niobium-91 | 680  | 21
californium-251 | 898  | 28.3
holmium-166(m1) | 1,200  | 38
berkelium-247 | 1,380  | 44
radium-226 | 1,600  | 50
molybdenum-93 | 4,000  | 130
holmium-153 | 4,570  | 144
curium-246 | 4,730  | 149
carbon-14[1] | 5,730  | 181
plutonium-240 | 6,563  | 207.1
thorium-229 | 7,340  | 232
americium-243 | 7,370  | 233
curium-245 | 8,500  | 270
curium-250 | 9,000  | 280
niobium-94 | 20,300  | 640
plutonium-239 | 24,110  | 761

## 1012 seconds (teraseconds)

isotope  | half-life

|

103 years  | 1012 seconds
protactinium-231 | 32.76  | 1.034
lead-202 | 52.5  | 1.66
lanthanum-137 | 60  | 1.9
thorium-230 | 75.38  | 2.379
nickel-59 | 76  | 2.4
calcium-41 | 103  | 3.3
neptunium-236 | 154  | 4.9
uranium-233 | 159.2  | 5.02
rhenium-186(m) | 200  | 6.3
technetium-99 | 211.1  | 6.66
krypton-81 | 229  | 7.2
tin-126 | 230  | 7.3
uranium-234 | 245.5  | 7.75
plutonium-242 | 272.3  | 8.59
chlorine-36 | 301  | 9.5
curium-248 | 340  | 11
bismuth-208 | 368  | 11.6
aluminium-26 | 717  | 22.6
| 106 years  | 1012 seconds
selenium-79 | 1.13  | 36
iron-60 | 2.6  | 82
beryllium-10 | 1.36  | 43
zirconium-93 | 1.53  | 48
gadolinium-150 | 1.79  | 56
neptunium-237 | 2.144  | 67.7
caesium-135 | 2.3  | 73
technetium-97 | 2.6  | 82
dysprosium-154 | 3  | 95
bismuth-210(m) | 3.04  | 96
manganese-53 | 3.7  | 120
technetium-98 | 4.2  | 130
palladium-107 | 6.5  | 210
hafnium-182 | 9  | 280
lead-205 | 15.3  | 480
curium-247 | 15.6  | 490
iodine-129 | 15.7  | 500
uranium-236 | 23.42  | 739

## 1015 seconds (petaseconds)

isotope  | half-life

|

106 years  | 1015 seconds
niobium-92 | 34.7  | 1.10
samarium-146 | 68  | 2.1
plutonium-244 | 80  | 2.5
uranium-235 | 703.8  | 22.21
| 109 years  | 1015 seconds
potassium-40 | 1.277  | 40.3
uranium-238 | 4.468  | 141.0
thorium-232 | 14.056  | 443.6

## 1018 seconds (exaseconds)

isotope  | half-life

|

109 years  | 1018 seconds
lutetium-176 | 38.5  | 1.21
rhenium-187 | 41.2 ± .2  | 1.3002 ± 0.0063
rubidium-87 | 49.23  | 1.554
lanthanum-138 | 102  | 3.2
samarium-147 | 106  | 3.3
platinum-190 | 650 ± 30  | 20.51 ± 0.95

## 1021 seconds (zettaseconds)

isotope  | half-life

|

1012 years  | 1021 seconds
gadolinium-152 | 108  | 3.4
indium-115 | 441  | 13.9
| 1015 years  | 1021 seconds
tantalum-180m | 1.0  | 32
hafnium-174 | 2.0  | 63
osmium-186 | 2.0  | 63
neodymium-144 | 2.29  | 72
samarium-148 | 7  | 220
cadmium-113 | 7.7  | 240

## 1024 seconds (yottaseconds)

isotope  | half-life

|

1015 years  | 1024 seconds
vanadium-50 | 140 ± 40  | 4.4 ± 1.3
| 1018 years  | 1024 seconds
tungsten-180 | 1.8 ± .2  | 56.8 ± 6.3
europium-151 | 5  | 160
neodymium-150 | 6.7  | 210
molybdenum-100 | 8.5  | 270
bismuth-209 | 19 ± 2  | 600 ± 63
zirconium-96 | 20  | 630
cadmium-116 | 31 ± 4  | 980 ± 130

## 1027 seconds (xonaseconds)

isotope  | half-life

|

1018 years  | 1027 seconds
calcium-48 | 43  | 1.4
selenium-82 | 97  | 3.1
tellurium-130 | 790  | 25
| 1021 years  | 1027 seconds
barium-130 | 1.6  | 50
germanium-76 | 1.8  | 57
xenon-136 | 2.38  | 75
krypton-78 | 9.2  | 290

## 1030 seconds (wecaseconds)

isotope  | half-life

|

1024 years  | 1030 seconds
tellurium-128 | 2.2 ± 0.3  | 69.4 ± 9.5

Tellurium-128's half-life is over 160 trillion times greater than the age of the universe.[2]

## See also

* List of isotopes
* List of elements by stability of isotopes
* Orders of magnitude (time)
* Lists of isotopes by element

## Notes

1. ↑ 14C is used in radiocarbon dating.
2. ↑ Walker, John. "Barely Radioactive Elements" (in en). https://www.fourmilab.ch/documents/barely_radioactive/.

## External links

* Radioactive isotope table "lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above.

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