This is a list of radioactive isotopes ordered by half-life from shortest to longest.
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
- ↑ 14C is used in radiocarbon dating.
- ↑ 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.
From Handwiki 
KSF