Wikimedia list article
This is a list of radioactive nuclides (sometimes also called isotopes ), ordered by half-life from shortest to longest, in seconds, minutes, hours, days, and years. Current methods make it difficult to measure half-lives between approximately 10−19 and 10−10 seconds.[1]
10−24 seconds (yoctoseconds) [ ]
half-life 10−24 seconds
hydrogen-7
23
lithium-4
75.6
hydrogen-5
>91
hydrogen-4
139
nitrogen-10
200
hydrogen-6
290
lithium-5
304
boron-7
350
fluorine-14
500
nitrogen-11
590
beryllium-16
650
nitrogen-11m
690
helium-5
700
boron-21
<760
beryllium-15
790
boron-20
>912
beryllium-11m
930
23 ys is the time needed to traverse a 7 femtometre distance at the speed of light, around the diameter of a large atomic nucleus .
10−21 seconds (zeptoseconds) [ ]
half-life 10−21 seconds
fluorine-15
1.11
oxygen-12
1.14
sodium-18
1.34
lithium-10m2
1.35
helium-10
1.52
lithium-10
2
carbon-8
2
beryllium-13
2.7
helium-7
2.51
lithium-13
3.3
lithium-10m1
3.7
neon-16
3.74
beryllium-6
5
helium-9
7
fluorine-16
11
boron-9
845
10−18 seconds (attoseconds) [ ]
half-life 10−18 seconds
beryllium-9m
1.25
beryllium-8
81.9
10−15 seconds (femtoseconds) [ ]
half-life 10−15 seconds
oxygen-27
1.75
10−12 seconds (picoseconds) [ ]
half-life 10−12 seconds
boron-16
≤190
10−9 seconds (nanoseconds) [ ]
half-life 10−9 seconds
lithium-12
<10
boron-18
26
carbon-21
30
fluorine-28
40
oxygen-26
40
sodium-19
40
oxygen-25
50
nitrogen-24
52
protactinium-219
53
neon-34
60
sodium-37
60
protactinium-220m2
69
actinium-217
69
francium-215
86
lead-196m1
<100
uranium-236m1
100
bismuth-199m2
100
oxygen-28
100
curium-247m2
100.6
actinium-218m
103
francium-214m2
103
bismuth-201m3
105
lead-202m3
107
francium-214m3
108
thorium-218
109
lead-202m2
110
neptunium-238m
112
polonium-205m4
115
bismuth-201m2
118
uranium-236m2
120
lead-203m3
122
bismuth-201m4
124
astatine-213
125
lead-193m2
135
lead-198m2
137
lead-196m3
140
lead-190m1
150
thallium-198m2
150
americium-239m
163
lead-192m1
164
bismuth-199m3
168
neon-33
180
sodium-36
180
curium-242m
180
radium-216
182
plutonium-239m1
193
bismuth-203m2
194
polonium-198m1
200
polonium-202m
>200
polonium-203m2
>200
lead-210m
201
lead-206m2
202
bismuth-197m2
204
polonium-207m1
205
bismuth-197m5
209
lead-198m3
212
lead-205m3
217
polonium-206m1
222
beryllium-12m
233
thallium-205m2
235
polonium-211m2
243
radon-214m
245
fluorine-31
250
uranium-239m1
>250
bismuth-197m4
253
fluorine-30
260
nitrogen-25
260
polonium-210m
263
bismuth-197m3
263
lead-204m1
265
astatine-214m1
265
radium-208m
270
lead-196m4
270
radon-214
270
uranium-238m
280
curium-245m
290
thallium-192m2
296
polonium-212
299
protactinium-220m1
308
bismuth-202m2
310
polonium-205m1
310
plutonium-243m
330
thallium-200m2
330
neptunium-222
380
lead-216m
400
astatine-206m
410
protactinium-229m
420
lead-204m3
450
lead-208m
500
bismuth-190m2
>500
curium-244m2
>500
lead-201m2
508
radium-215m3
555
astatine-214
558
berkelium-242m
600
thorium-216m2
615
radon-210m1
644
uranium-221
660
francium-216
700
actinium-217m
740
bismuth-195m2
750
polonium-198m2
750
lead-192m3
756
astatine-214m2
760
protactinium-220
780
uranium-239m2
780
lead-188m2
797
lead-188m1
830
radium-212m2
850
polonium-196m
850
bismuth-189m2
880
plutonium-241m1
880
10−6 seconds (microseconds) [ ]
half-life 10−6 seconds
lead-196m2
<1
polonium-192m
~1
radon-210m3
1.04
thorium-219
1.05
polonium-206m2
1.05
radon-210m2
1.06
curium-243m
1.08
actinium-218
1.08
lead-192m2
1.1
plutonium-237m2
1.1
lead-197m2
1.15
americium-241m
1.2
radium-215m2
1.39
bismuth-211m
1.4
uranium-222
1.4
radium-217
1.63
neptunium-223
2.15
radium-210m
2.24
radon-215
2.30
bismuth-217m
2.70
polonium-211m3
2.8
radon-209m2
3.0
bismuth-202m1
3.04
polonium-213
3.65
lead-198m1
4.19
protactinium-221
4.9
astatine-210m2
5.66
nobelium-250
5.7
lead-212m
6.0
lead-214m
6.2
bismuth-187m2
7
thorium-229m
7
radium-215m1
7.1
lead-190m3
7.2
plutonium-239m2
7.5
bismuth-206m1
7.7
astatine-205m
7.76
thorium-220
9.7
lead-195m2
10.0
lead-199m2
10.1
radium-212m1
10.9
astatine-196m2
11
actinium-219
11.8
radon-209m1
13.4
polonium-194m
15
francium-217
16.8
uranium-223
21
plutonium-241m2
21
fermium-251m
21.1
curium-249m
23
rutherfordium-254
23
lead-205m1
24.2
neptunium-220
25
lead-190m2
25
radium-218
25.2
lead-189m2
26
curium-247m1
26.3
berkelium-250m1
29
nobelium-253m
31
polonium-186
34
americium-238m
35
nobelium-250m
36
neptunium-224
38
californium-249m
45
radon-216
45
rutherfordium-253
48
bismuth-185m
49
polonium-207m2
49
radium-231m
~53
uranium-219
55
berkelium-251m
58
americium-246m2
73
seaborgium-261m
92
astatine-215
100
astatine-216m
100
protactinium-218
113
lead-206m1
125
thorium-216m1
137
curium-248m
146
neptunium-219
150
astatine-212m2
152
polonium-214
164.3
radon-207m
181
bismuth-207m
182
darmstadtium-270
205
berkelium-250m2
213
darmstadtium-269
230
lead-178
230
copernicium-277
240
thorium-217
240
darmstadtium-273
240
berkelium-249m
300
astatine-216
300
bismuth-187m1
320
nihonium-278
340
hassium-265m
360
fermium-258
370
polonium-188
430
actinium-216
440
actinium-216m
443
astatine-210m1
482
polonium-187m
500
hassium-264
540
radon-217
540
polonium-205m2
645
copernicium-277
690
oganesson-294
690
fermium-241
730
hassium-263
760
fermium-242
800
bismuth-206m2
890
mendelevium-245
900
copernicium-282
910
uranium-224
940
10−3 seconds (milliseconds) [ ]
half-life 10−3 seconds
francium-218
1.0
bismuth-204m2
1.07
protactinium-217m
1.08
meitnerium-266
1.2
nobelium-258
1.2
uranium-216m
1.31
polonium-187
1.40
nihonium-278
1.4
sodium-35
1.5
radium-215
1.55
darmstadtium-271m
1.7
astatine-191
1.7
thorium-208
1.7
thorium-221
1.73
polonium-215
1.781
hassium-265
1.96
bismuth-185
2
roentgenium-272
2
astatine-191m
2.1
radium-213m
2.1
thorium-222
2.237
uranium-215
2.24
polonium-190
2.46
fluorine-29
2.5
flerovium-284
2.5
bismuth-208m
2.58
radium-202
2.6
boron-19
2.92
seaborgium-258
3
hassium-266
3.02
fermium-244
3.12
protactinium-222
3.2
francium-214m1
3.35
neon-31
3.4
protactinium-217
3.48
neon-32
3.5
darmstadtium-277
3.5
protactinium-211
3.8
lead-179
3.9
roentgenium-278
4
radium-203
4
seaborgium-260
4
uranium-216
4.3
beryllium-14
4.35
lead-180
4.5
radon-196
4.7
fluorine-27
5
bismuth-189m1
5.0
francium-214
5.0
meitnerium-277
5
nobelium-262
5
polonium-189
5
boron-17
5.08
protactinium-223
5.1
americium-223
5.2
sodium-34
5.5
lead-205m2
5.55
neptunium-225
6
uranium-218
6
radon-195
6
radon-195m
6
carbon-22
6.2
meitnerium-270
6.3
rutherfordium-256
6.4
bismuth-184
6.6
thorium-209
7
protactinium-213
7
seaborgium-262
7
neon-30
7.3
protactinium-212
8
sodium-33
8
livermorium-290
8.3
oxygen-13
8.58
lithium-11
8.59
fluorine-26
9.6
bohrium-262m
9.6
bismuth-186m
9.8
boron-15
9.87
darmstadtium-270m
10
radium-219
10
hassium-277
11
nitrogen-12
11
astatine-192
11.5
bohrium-261
11.8
roentgenium-274
12
boron-14
12.5
bismuth-204m1
13.0
livermorium-292
13
bismuth-184m
13
sodium-32
13.2
americium-242m2
14.0
protactinium-215
14
nitrogen-23
14.5
rutherfordium-258
14.7
bismuth-186
14.8
neon-29
14.8
actinium-206m1
15
carbon-20
16
francium-199
16
protactinium-214
17
sodium-31
17
thorium-210
17
boron-13
17.33
radium-220
17.9
neon-28
18.9
livermorium-291
19
radon-213
19.5
actinium-205
20
astatine-196m1
20
rutherfordium-270
20
francium-219
20
meitnerium-275
20
boron-12
20.2
radon-197m
21
rutherfordium-260
21
astatine-193m1
21
californium-238
21.1
beryllium-12
21.49
francium-218m1
22.0
tennessine-293
22
polonium-191
22
francium-200
24
nitrogen-22
24
actinium-206
25
uranium-217
26
actinium-220
26.36
thorium-216
26.8
meitnerium-268
27
astatine-193m2
27
lawrencium-251
27
actinium-208m
28
astatine-193
28
sodium-28
30.5
actinium-207
31
neon-27
32
bismuth-187
32
polonium-192
32.2
astatine-217
32.3
uranium-234m
33.5
curium-244m1
34
bohrium-260
35
radon-218
35
neptunium-226
35
thorium-212
36
moscovium-287
37
seaborgium-264
37
dubnium-255
37
actinium-206m2
41
radium-203m
41
bismuth-188
44
sodium-29
44.9
lead-181
45
carbon-19
46.2
thorium-211
48
sodium-30
48.4
fluorine-25
50
tennessine-294
51
actinium-221
52
hassium-267
55
radium-207m
57
livermorium-293
57
polonium-205m3
57.4
radium-204
60
lead-182
60
uranium-225
61
oxygen-24
65
radon-198
65
radon-197
66
francium-201
67
nihonium-282
73
nihonium-283
75
oxygen-23
82
bohrium-262
84
nitrogen-21
87
astatine-192m
88
darmstadtium-271
90
roentgenium-279
90
carbon-18
92
actinium-209
92
polonium-191m
93
actinium-208
97
copernicium-284
98
thorium-214
100
flerovium-285
100
protactinium-216
105
nobelium-260
106
astatine-204m
108
astatine-212m1
119
helium-8
119
flerovium-286
120
seaborgium-263m
120
bismuth-191m
124
carbon-9
126.5
nitrogen-20
130
thorium-213
140
polonium-216
145
astatine-195m
147
moscovium-288
164
actinium-215
170
lithium-9
178.3
copernicium-281
180
radium-205m
180
plutonium-237m1
180
neon-26
192
carbon-17
193
mendelevium-247m
200
seaborgium-261
200
darmstadtium-279
210
actinium-211
213
bismuth-188m
220
radium-205
220
fermium-243
231
polonium-193m
240
radium-206
240
astatine-196
253
uranium-226
269
nitrogen-19
271
hassium-266m
280
nobelium-254m
280
astatine-194
286
hassium-275
290
francium-202
290
sodium-27
301
bismuth-203m1
303
astatine-212
314
radon-199m
320
astatine-194m
323
astatine-195
328
moscovium-289
330
francium-202m
340
actinium-210
350
seaborgium-266
360
astatine-197
390
fluorine-24
390
lawrencium-252
390
polonium-194
392
bismuth-200m2
400
mendelevium-245m
400
mendelevium-244
400
lead-183m
415
polonium-193
420
meitnerium-274
440
sodium-20
447.9
meitnerium-276
450
astatine-202m2
460
flerovium-287
480
lead-203m2
480
lead-184
490
hassium-273
510
neptunium-227
510
dubnium-259
510
polonium-211
516
lead-183
535
francium-203
550
lawrencium-253
580
thorium-223
600
bismuth-196m1
600
seaborgium-259
600
neon-25
602
radon-199
620
nitrogen-18
622
lawrencium-257
646
moscovium-290
650
francium-200m
650
flerovium-288
660
dubnium-257m
670
bismuth-189
674
francium-206m2
700
actinium-213
731
carbon-16
747
boron-8
770
nobelium-251
780
lead-207m
806
helium-6
806.7
lithium-8
839.9
protactinium-224
844
bohrium-265
900
bohrium-266
900
lutetium-153
900
nihonium-284
910
actinium-212
920
radon-200
960
bohrium-264
970
100 seconds [ ]
half-life seconds
seaborgium-263
1
astatine-198m
1.0
mendelevium-246
1.0
thorium-224
1.05
sodium-26
1.077
plutonium-228
1.1
mendelevium-247
1.12
curium-246m
1.12
bohrium-271
1.2
thorium-215
1.2
radium-208
1.3
radium-207
1.3
rutherfordium-268
1.4
hassium-268
1.42
polonium-217
1.47
astatine-218
1.5
lawrencium-253m
1.5
fermium-259
1.5
dubnium-260
1.52
dubnium-257
1.53
fermium-246
1.54
neon-18
1.672
francium-204
1.7
francium-204m2
1.7
nobelium-251m
1.7
protactinium-225
1.7
americium-229
1.8
flerovium-289
1.9
dubnium-256
1.9
mendelevium-249m
1.9
dubnium-258m
1.9
polonium-195m
1.92
fermium-250m
1.92
astatine-197m
2.0
californium-237
2.1
fluorine-23
2.23
oxygen-22
2.25
nobelium-252
2.27
rutherfordium-255
2.3
rutherfordium-262
2.3
carbon-15
2.449
radium-214
2.46
rutherfordium-259m
2.5
francium-204m1
2.6
flerovium-289
2.6
radium-213
2.74
polonium-207m3
2.79
nobelium-256
2.91
bismuth-193m
3.2
rutherfordium-259
3.2
oxygen-21
3.42
astatine-200m2
3.5
radium-210
3.7
francium-205
3.80
radon-201m
3.8
radon-219
3.96
rutherfordium-261m
4
lead-185m
4.07
rutherfordium-257m
4.1
lawrencium-258
4.1
fluorine-21
4.158
nitrogen-17
4.173
copernicium-283
4.2
astatine-198
4.2
nihonium-285
4.2
fermium-245
4.2
fluorine-22
4.23
meitnerium-278
4.5
dubnium-258
4.5
dubnium-261
4.5
roentgenium-280
4.6
radium-209
4.6
polonium-195
4.64
rutherfordium-257
4.7
lead-186
4.82
actinium-222
5.0
francium-232
5
polonium-196
5.56
einsteinium-240
6
lawrencium-259
6.2
bismuth-190m1
6.2
lead-203m1
6.21
bismuth-190
6.3
lead-185
6.3
astatine-199
6.92
radon-201
7.0
mendelevium-248
7
nitrogen-16
7.13
bismuth-198m2
7.7
seaborgium-265
8
actinium-214
8.2
bismuth-219
8.7
hassium-270
9
bismuth-220
9.5
nihonium-286
9.5
bohrium-272
9.8
radon-202
9.94
hassium-271
10
einsteinium-241
10
fluorine-20
11.07
radon-229
12
bismuth-191
12.3
darmstadtium-281
12.7
radium-212
13.0
radium-211
13
lawrencium-254
13
einsteinium-242
13.5
oxygen-20
13.51
beryllium-11
13.81
francium-207
14.8
lead-218
15
lead-187
15.2
francium-206m1
15.9
francium-206
16
hassium-269
16
seaborgium-265m
16.2
bohrium-267
17
roentgenium-281
17
neon-19
17.22
francium-231
17.6
lead-187m
18.3
berkelium-234
19
francium-230
19.1
carbon-10
19.29
lead-217
20
radon-227
20.8
einsteinium-243
21
berkelium-233
21
berkelium-236
22
lawrencium-255
22
sodium-21
22.49
rutherfordium-266
23
mendelevium-249
24
nobelium-257
25
polonium-211m1
25.2
lead-188
25.5
polonium-197m
25.8
oxygen-19
26.464
radon-203m
26.7
curium-233
27
lawrencium-256
27
francium-220
27.4
copernicium-285
28
radium-221
28
dubnium-263
29
radium-234
30
radium-233
30
fermium-247
31
americium-230
32
bismuth-218
33
bismuth-192
34.6
francium-213
34.6
dubnium-262
35
fermium-248
35.1
bismuth-215m
36.9
einsteinium-244
37
neon-23
37.24
radium-222
38.0
francium-228
38
bismuth-192m
39.6
polonium-220
40
bohrium-274
40
astatine-200
43.2
actinium-234
44
radon-203
44.2
polonium-203m1
45
polonium-212m
45.1
astatine-200m1
47
francium-226
49
francium-209
50.0
astatine-223
50
francium-229
50.2
lead-189m1
50.5
nobelium-254
51
lead-189
51
curium-234
52
mendelevium-250
52
polonium-197
53.6
astatine-222
54
radon-220
55.6
astatine-219
56
francium-208
59.1
sodium-25
59.1
minutes
seconds
californium-239
1.0
60
actinium-235
1.0
60
lead-201m1
1.02
61
bohrium-270
1.02
61
neptunium-228
1.023
61.4
actinium-222m
1.05
63
californium-240
1.06
64
fluorine-17
1.0748
64.49
radon-228
1.08
65
rutherfordium-263
1.1
66
uranium-227
1.1
66
einsteinium-245
1.1
66
bismuth-193
1.12
67
radon-204
1.17
70
protactinium-234m
1.17
70
oxygen-14
1.1770
70.62
lead-190
1.18
71
actinium-236
1.20
72
rutherfordium-261
1.30
78
americium-232
1.32
79
lead-191
1.33
80
seaborgium-267
1.4
84
astatine-201
1.42
85
bismuth-195m1
1.45
87
bismuth-194
1.58
95
fermium-249
1.6
96
nobelium-253
1.62
97
bismuth-217
1.642
98.5
lead-216
1.65
99
roentgenium-282
1.7
100
plutonium-230
1.70
102
radium-231
1.72
103
polonium-198
1.77
106
protactinium-226
1.8
110
berkelium-252
1.8
110
neptunium-243
1.85
111
bismuth-194m2
1.92
115
actinium-232
1.98
119
protactinium-240
2
120
plutonium-229
2.0
120
actinium-230
2.03
122
oxygen-15
2.0373
122.24
bismuth-194m1
2.08
125
actinium-223
2.10
126
bismuth-211
2.14
128
bismuth-216
2.17
130
lead-191m
2.18
131
polonium-221
2.2
130
neptunium-242
2.2
130
protactinium-238
2.27
136
neptunium-244
2.29
137
mendelevium-252
2.30
138
astatine-221
2.3
140
americium-234
2.32
139
lead-215
2.34
140
berkelium-238
2.40
144
seaborgium-271
2.4
140
actinium-233
2.42
145
francium-227
2.47
148
astatine-224
2.5
150
lawrencium-260
2.7
160
radon-205
2.8
170
astatine-202m1
3.03
182
bismuth-195
3.05
183
astatine-202
3.07
184
polonium-218
3.10
186
francium-211
3.10
186
nobelium-255
3.1
190
francium-210
3.18
191
americium-233
3.2
190
francium-224
3.33
200
neon-24
3.38
203
californium-242
3.49
209
lead-192
3.5
210
americium-236
3.6
220
astatine-220
3.71
223
californium-241
3.78
227
radium-229
4.0
240
mendelevium-251
4.0
240
francium-225
4.0
240
neptunium-229
4.0
240
bismuth-196m2
4.00
240
radium-232
4.2
250
polonium-199m
4.17
250
einsteinium-247
4.55
273
berkelium-241
4.6
280
neptunium-230
4.6
280
radon-225
4.66
280
berkelium-240
4.8
290
thorium-237
4.8
290
francium-221
4.9
290
curium-235
5
300
lead-193
5
300
bismuth-197m1
5.04
302
bismuth-196
5.1
310
polonium-199
5.48
329
neptunium-242m
5.5
330
radon-206
5.67
340
lead-193m1
5.8
350
bismuth-216m
6.6
400
curium-236
6.8
410
berkelium-242
7.0
420
bismuth-212m2
7.0
420
thorium-235
7.2
430
neptunium-240m
7.22
433
astatine-203
7.37
442
radon-226
7.4
440
actinium-231
7.5
450
bismuth-215
7.6
460
einsteinium-246
7.7
460
lead-197
8.1
490
plutonium-231
8.6
520
protactinium-237
8.7
520
thorium-225
8.72
523
polonium-201m
8.9
530
protactinium-236
9.1
550
polonium-222
9.1
550
uranium-228
9.1
550
astatine-204
9.2
550
radon-207
9.25
555
bismuth-197
9.33
560
thorium-238
9.4
560
copper-62
9.673
580.4
americium-235
9.9
590
nitrogen-13
9.965
597.9
berkelium-253
10
600
mercury-210 [2]
10
600
mendelevium-254
10
600
lead-213
10.2
610
bismuth-198
10.3
620
polonium-219
10.3
620
californium-243
10.7
640
polonium-200
11.5
690
bismuth-198m1
11.6
700
lead-194
12.0
720
mendelevium-253
12
720
lead-199m1
12.2
730
californium-256
12.3
740
neptunium-241
13.9
830
seaborgium-269
14
840
francium-222
14.2
850
[free] neutron , 1 0 n
14.692
881.5
neptunium-232
14.7
880
lead-195m1
15.0
900
rutherfordium-263
15
900
lead-195
~15
~900
polonium-201
15.3
920
103 seconds (kiloseconds) [ ]
half-life
minutes
103 seconds
curium-251
16.8
1.01
uranium-242
16.8
1.01
californium-244
19.4
1.16
bismuth-214
19.9
1.19
francium-212
20.0
1.20
curium-237
20
1.2
carbon-11
20.334
1.2200
plutonium-233
20.9
1.25
thorium-233
21.83
1.310
francium-223
22.00
1.320
americium-247
23.0
1.38
uranium-239
23.45
1.407
radon-212
23.9
1.43
radon-223
24.3
1.46
radon-208
24.35
1.461
protactinium-235
24.44
1.466
bismuth-199m1
24.70
1.482
bismuth-212m1
25.0
1.50
americium-246m1
25.0
1.50
plutonium-235
25.3
1.52
einsteinium-256
25.4
1.52
radon-221
25.7
1.54
americium-244m
26
1.6
uranium-235m
26
1.6
astatine-205
26.2
1.57
lead-214
26.8
1.61
mendelevium-255
27
1.6
bismuth-199
27
1.6
einsteinium-248
27
1.6
mendelevium-254m
28
1.7
radon-209
28.5
1.71
fermium-250
30.4
1.82
thorium-226
30.57
1.834
astatine-206
30.6
1.84
bismuth-200m1
31
1.9
plutonium-232
33.7
2.02
lead-211
36.1
2.17
neptunium-233
36.2
2.17
bismuth-200
36.4
2.18
polonium-203
36.7
2.20
lead-196
37
2.2
thorium-236
37.5
2.25
protactinium-227
38.3
2.30
americium-246
39
2.3
radium-227
42.2
2.53
lead-197m1
42.9
2.57
lawrencium-261
44
2.6
polonium-202
44.7
2.68
californium-245
45.0
2.70
bismuth-213
45.59
2.735
neptunium-231
48.8
2.93
berkelium-251
55.6
3.34
mendelevium-258m
57.0
3.42
uranium-229
58
3.5
nobelium-259
58
3.5
bismuth-201m1
59.1
3.55
hours
103 seconds
dubnium-270
1.0
3.6
bismuth-212
1.0092
3.633
neptunium-240
1.032
3.72
actinium-229
1.045
3.76
curium-249
1.0692
3.849
lead-204m2
1.12
4.0
gallium-68
1.1285
4.063
americium-237
1.22
4.4
mendelevium-256
1.283
4.62
rutherfordium-267
1.3
4.7
dubnium-266
1.33
4.8
californium-255
1.417
5.10
lead-199
1.50
5.4
radium-230
1.55
5.6
mendelevium-259
1.60
5.8
americium-238
1.63
5.9
astatine-208
1.63
5.9
polonium-205
1.66
6.0
einsteinium-249
1.703
6.13
bismuth-202
1.72
6.2
astatine-207
1.80
6.5
bismuth-201
1.80
6.5
protactinium-239
1.8
6.5
fluorine-18
1.8295
6.586
americium-245
2.05
7.4
einsteinium-250m
2.22
8.0
radon-210
2.4
8.6
lead-198
2.4
8.6
curium-238
2.4
8.6
curium-239
2.5
9.0
fermium-256
2.627
9.46
actinium-224
2.78
10.0
californium-247
3.11
11.2
berkelium-250
3.212
11.56
fermium-254
3.240
11.66
lead-209
3.253
11.71
lead-202m1
3.53
12.7
polonium-204
3.53
12.7
lawrencium-262
3.6
13
berkelium-244
4.35
15.7
berkelium-243
4.5
16
dubnium-267
4.6
17
plutonium-243
4.956
17.84
fermium-251
5.30
19.1
polonium-207
5.80
20.9
astatine-209
5.41
19.5
mendelevium-257
5.52
19.9
actinium-228
6.13
22.1
protactinium-234
6.70
24.1
astatine-211
7.214
25.97
einsteinium-256m
7.6
27
astatine-210
8.1
29
einsteinium-250
8.6
31
plutonium-234
8.8
32
lead-201
9.33
33.6
americium-244
10.1
36
erbium-165
10.36
37.3
plutonium-245
10.5
38
lead-212
10.64
38.3
lawrencium-266
11
40
bismuth-204
11.22
40.4
bismuth-203
11.76
42.3
americium-239
11.9
43
uranium-240
14.1
51
radon-211
14.6
53
sodium-24
14.96
53.9
americium-242
16.02
57.7
fermium-255
20.07
72.3
lead-200
21.5
77
protactinium-228
22
79
neptunium-236m
22.5
81
berkelium-248m
23.7
85
days
103 seconds
fermium-252
1.058
91.4
thorium-231
1.0634
91.88
dubnium-268
1.283
110.9
erbium-160
1.191
102.9
actinium-226
1.2238
105.74
protactinium-232
1.31
113
einsteinium-251
1.375
118.8
californium-246
1.4875
128.52
protactinium-229
1.50
130
einsteinium-255
1.6375
141.48
berkelium-246
1.80
156
neptunium-238
2.117
182.9
americium-240
2.117
182.9
lead-203
2.16138
186.743
plutonium-247
2.27
196
neptunium-239
2.356
203.6
gold-198
2.695
232.8
fermium-253
3.00
259
gold-199
3.169
273.8
radium-224
3.6319
313.80
radon-222
3.8235
330.35
uranium-231
4.2
360
neptunium-234
4.4
380
calcium-47
4.536
391.9
berkelium-245
4.94
427
bismuth-210
5.012
433.0
manganese-52
5.591
483.1
gold-196
6.183
534.2
bismuth-206
6.243
539.4
uranium-237
6.75
583
einsteinium-257
7.7
670
iodine-131
8.02
693
polonium-206
8.8
760
thulium-167
9.25
799
actinium-225
10.0
860
plutonium-246
10.84
937
radium-223
11.43
988
106 seconds (megaseconds) [ ]
half-life
days
106 seconds
phosphorus-32
14.29
1.235
radium-225
14.9
1.29
bismuth-205
15.31
1.323
vanadium-48
15.9735
1.38011
protactinium-230
17.4
1.50
californium-253
17.81
1.539
thorium-227
18.68
1.614
einsteinium-253
20.47
1.769
uranium-230
20.8
1.80
thorium-234
24.10
2.082
protactinium-233
26.975
2.3306
curium-240
27
2.3
chromium-51
27.7025
2.39350
mendelevium-260
27.8
2.40
curium-241
32.8
2.83
einsteinium-255
39.8
3.44
plutonium-237
45.2
3.91
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
138.376
11.9557
calcium-45
162.7
14.06
curium-242
162.8
14.07
gold-195
186.1
16.08
zinc-65
243.7
21.06
cobalt-57
271.79
23.483
einsteinium-254
275.7
23.82
vanadium-49
330
29
berkelium-249
330
29
californium-248
333.5
28.81
years
106 seconds
ruthenium-106
1.023
32.3
neptunium-235
1.0845
34.22
cadmium-109
1.267
40.0
einsteinium-252
1.2915
40.76
thorium-228
1.9116
60.33
thulium-171
1.92
61
caesium-134
2.0652
65.17
sodium-22
2.602
82.1
californium-252
2.645
83.5
iron-55
2.756
87.0
plutonium-236
2.858
90.2
polonium-208
2.898
0.2504
rhodium-101
3.3
100
cobalt-60
5.2714
166.35
radium-228
5.75
181
krypton-85
10.756
339.4
hydrogen-3 (also known as tritium )
12.32
389
californium-250
13.08
413
plutonium-241
14.290
451.0
niobium-93m
16.13
509
curium-244
18.10
571
actinium-227
21.772
687.1
lead-210
22.3
700
strontium-90
28.79
909
curium-243
29.1
920
caesium-137
30.17
952
109 seconds (gigaseconds) [ ]
half-life
years
109 seconds
bismuth-207
32.9
1.04
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
polonium-209
125.2
3.95
americium-242m1
141
4.4
silicon-32
170
5.4
argon-39
269
8.5
berkelium-248
>300
>9.5
californium-249
351
11.1
silver-108m
418
13.2
americium-241
432.2
13.64
mercury-194
444
14.0
niobium-91
680
21
californium-251
900
28
holmium-166m1
1,200
38
berkelium-247
1,380
44
radium-226
1,600
50
molybdenum-93
4,000
130
holmium-163
4,570
144
curium-246
4,760
150
carbon-14 [3]
5,730
181
plutonium-240
6,561
207.0
thorium-229
7,340
232
americium-243
7,370
233
curium-250
8,300
260
curium-245
8,500
270
niobium-94
20,300
640
plutonium-239
24,110
761
1012 seconds (teraseconds) [ ]
half-life
millennia
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-186m
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
chlorine-36
301
9.5
selenium-79
327
10.3
curium-248
348
11.0
bismuth-208
368
11.6
plutonium-242
375
11.8
aluminium-26
717
22.6
106 years
1012 seconds
beryllium-10
1.39
44
zirconium-93
1.53
48
gadolinium-150
1.79
56
neptunium-237
2.144
67.7
caesium-135
2.3
73
iron-60
2.6
82
technetium-97
2.6
82
dysprosium-154
3.0
95
bismuth-210m
3.04
96
manganese-53
3.7
120
technetium-98
4.2
130
palladium-107
6.5
210
hafnium-182
8.9
280
lead-205
17.3
550
curium-247
15.6
490
iodine-129
15.7
500
uranium-236
23.42
739
1015 seconds (petaseconds) [ ]
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
1.251
39.5
uranium-238
4.468
141.0
thorium-232
14.05
443
1018 seconds (exaseconds) [ ]
half-life
109 years
1018 seconds
lutetium-176
37.64
1.188
rhenium-187
41.22
1.301
rubidium-87
49.72
1.569
lanthanum-138
102.1
3.22
samarium-147
106.1
3.35
platinum-190
650
21
1021 seconds (zettaseconds) [ ]
half-life
1012 years
1021 seconds
gadolinium-152
110
3.5
indium-115
440
14
1015 years
1021 seconds
hafnium-174
2.002
63.2
osmium-186
2.002
63.2
neodymium-144
2.292
72.3
samarium-148
7.005
221.1
cadmium-113
7.7
240
1024 seconds (yottaseconds) [ ]
half-life
1015 years
1024 seconds
vanadium-50
140
4.4
1018 years
1024 seconds
tungsten-180
1.801
56.8
europium-151
5.004
157.9
molybdenum-100
7.804
246.3
neodymium-150
7.905
249.5
tellurium-130
8.806
277.9
zirconium-96
20
630
bismuth-209
20.1
630
calcium-48
23.01
726
cadmium-116
31.02
979
1027 seconds [ ]
half-life
1018 years
1027 seconds
selenium-82
110
3.5
1021 years
1027 seconds
barium-130
1.2
38
germanium-76
1.8
57
xenon-136
2.165
68.3
krypton-78
9.2
290
xenon-124
18
570
1030 seconds [ ]
half-life
1024 years
1030 seconds
tellurium-128
2.2
69
Tellurium-128's half-life is over 160 trillion times greater than the age of the universe (which is 4,35*1017 seconds).[4]
See also [ ]
List of elements by stability of isotopes
List of nuclides
Orders of magnitude (time)
Lists of isotopes, by element
Notes [ ]
External links [ ]
Radioactive isotope table "lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above.