List of radioactive nuclides by half-life

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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)[edit]

isotope 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
nitrogen-11m 690
helium-5 700

10−21 seconds (zeptoseconds)[edit]

isotope half-life
10−21 seconds
fluorine-15 1.11
oxygen-12 1.14
sodium-18 1.34
helium-10 1.52
lithium-10 2
carbon-8 2
beryllium-13 2.7
helium-7 2.51
neon-16 3.74
beryllium-6 5
helium-9 7
fluorine-16 11
boron-9 845

10−18 seconds (attoseconds)[edit]

isotope half-life
10−18 seconds
beryllium-8 81.9

10−15 seconds (femtoseconds)[edit]

isotope half-life
10−15 seconds
oxygen-27 1.75

10−12 seconds (picoseconds)[edit]

isotope half-life
10−12 seconds
boron-16 ≤190

10−9 seconds (nanoseconds)[edit]

isotope 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
beryllium-15 200
beryllium-16 200
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
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)[edit]

isotope 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)[edit]

isotope 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[edit]

isotope 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)[edit]

isotope 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)[edit]

isotope 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)[edit]

isotope half-life
years 109 seconds
bismuth-207 32.9 1,040
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)[edit]

isotope 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
curium-248 348 11.0
bismuth-208 368 11.6
plutonium-242 375 11.8
aluminium-26 717 22.6
106 years 1012 seconds
selenium-79 1.13 36
beryllium-10 1.51 48
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)[edit]

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 1.251 39.5
uranium-238 4.468 141.0
thorium-232 14.05 443

1018 seconds (exaseconds)[edit]

isotope 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)[edit]

isotope 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)[edit]

isotope 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[edit]

isotope 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[edit]

isotope 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.[4]

See also[edit]

Notes[edit]

  1. ^ Reaching the limits of nuclear stability, M. Thoennessen, Rep. Prog. Phys. 67 (2004), pp. 1187–1232, §2.3, doi:10.1088/0034-4885/67/7/R04.
  2. ^ https://ptable.com/#Isotope
  3. ^ 14
    C
    is used in radiocarbon dating.
  4. ^ Walker, John. "Barely Radioactive Elements". www.fourmilab.ch. Retrieved 2018-03-09.

External links[edit]

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