# List of radioactive nuclides by half-life

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.

## 10$^{−24}$ seconds (yoctoseconds)

| isotope | half-life 10$^{−24}$ seconds |
| hydrogen-5 | 86(6) |
| lithium-4 | 91(9) |
| hydrogen-4 | 139(10) |
| nitrogen-10 | 143(36) |
| oxygen-11 | 198(12) |
| helium-10 | 260(40) |
| hydrogen-6 | 294(67) |
| lithium-5 | 370(30) |
| fluorine-14 | 500(60) |
| boron-7 | 570(14) |
| nitrogen-11 | 585(7) |
| helium-5 | 602(22) |
| beryllium-16 | 650(130) |
| hydrogen-7 | 652(558) |
| nitrogen-11m | 690(80) |
| boron-21 | > 760 |
| neon-15 | 770(300) |
| beryllium-15 | 790(270) |
| boron-20 | > 912.4 |
| beryllium-11m | 930(130) |
Twenty-three yoctoseconds 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)

| isotope | half-life 10$^{−21}$ seconds |
| beryllium-13 | 1.0 |
| fluorine-15 | 1.11 |
| oxygen-12 | 1.14 |
| sodium-18 | 1.34 |
| lithium-10m2 | 1.35 |
| lithium-10 | 2.0 |
| beryllium-13 | 2.7 |
| helium-7 | 2.51 |
| lithium-13 | 3.3 |
| carbon-8 | 3.5 |
| lithium-10m1 | 3.7 |
| neon-16 | 3.74 |
| boron-14m | 4.15 |
| boron-16 | >4.6 |
| beryllium-6 | 5.0 |
| helium-9 | 7 |
| fluorine-16 | 11 |
| boron-9 | 845 |

## 10$^{−18}$ seconds (attoseconds)

| isotope | half-life 10$^{−18}$ seconds |
| nitrogen-9 | <1 |
| sodium-19 | <1 |
| beryllium-9m | 1.25 |
| lithium-6m | 56 |
| beryllium-8 | 81.9 |

## 10$^{−12}$ seconds (picoseconds)

| isotope | half-life 10$^{−12}$ seconds |
| oxygen-26 | 4.2 |
| magnesium-19 | 5(3) |
| argon-30 | <10 |
| potassium-31 | <10 |
| sodium-22m2 | 19.6 |
| boron-16 | ≤190 |

## 10$^{−9}$ seconds (nanoseconds)

| isotope | half-life 10$^{−9}$ seconds |
| helium-2 | <1 |
| 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 |
| neodymium-126 | >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)

| 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 |
| caesium-113 | 16.7(7) |
| 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 |
| caesium-112 | 500(100) |
| 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)

| 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 |
| magnesium-37 | 8 |
| livermorium-290 | 8.3 |
| oxygen-13 | 8.58 |
| lithium-11 | 8.59 |
| fluorine-26 | 9.6 |
| bohrium-262m | 9.6 |
| thorium-207 | 9.7 |
| 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 |
| manganese-68 | 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 | 388 |
| 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 |

## 10$^0$ seconds

| isotope | half-life seconds | half-life seconds |
| seaborgium-263 | 1 | 1 |
| astatine-198m | 1.0 | 1.0 |
| mendelevium-246 | 1.0 | 1.0 |
| thorium-224 | 1.05 | 1.05 |
| sodium-26 | 1.077 | 1.077 |
| plutonium-228 | 1.1 | 1.1 |
| mendelevium-247 | 1.12 | 1.12 |
| curium-246m | 1.12 | 1.12 |
| bohrium-271 | 1.2 | 1.2 |
| thorium-215 | 1.2 | 1.2 |
| radium-208 | 1.3 | 1.3 |
| radium-207 | 1.3 | 1.3 |
| rutherfordium-268 | 1.4 | 1.4 |
| hassium-268 | 1.42 | 1.42 |
| polonium-217 | 1.47 | 1.47 |
| astatine-218 | 1.5 | 1.5 |
| lawrencium-253m | 1.5 | 1.5 |
| fermium-259 | 1.5 | 1.5 |
| dubnium-260 | 1.52 | 1.52 |
| dubnium-257 | 1.53 | 1.53 |
| fermium-246 | 1.54 | 1.54 |
| neon-18 | 1.672 | 1.672 |
| francium-204 | 1.7 | 1.7 |
| francium-204m2 | 1.7 | 1.7 |
| nobelium-251m | 1.7 | 1.7 |
| protactinium-225 | 1.7 | 1.7 |
| americium-229 | 1.8 | 1.8 |
| flerovium-289 | 1.9 | 1.9 |
| dubnium-256 | 1.9 | 1.9 |
| mendelevium-249m | 1.9 | 1.9 |
| dubnium-258m | 1.9 | 1.9 |
| polonium-195m | 1.92 | 1.92 |
| fermium-250m | 1.92 | 1.92 |
| astatine-197m | 2.0 | 2.0 |
| californium-237 | 2.1 | 2.1 |
| fluorine-23 | 2.23 | 2.23 |
| oxygen-22 | 2.25 | 2.25 |
| nobelium-252 | 2.27 | 2.27 |
| rutherfordium-255 | 2.3 | 2.3 |
| rutherfordium-262 | 2.3 | 2.3 |
| carbon-15 | 2.449 | 2.449 |
| radium-214 | 2.46 | 2.46 |
| rutherfordium-259m | 2.5 | 2.5 |
| francium-204m1 | 2.6 | 2.6 |
| radium-213 | 2.74 | 2.74 |
| polonium-207m3 | 2.79 | 2.79 |
| nobelium-256 | 2.91 | 2.91 |
| bismuth-193m | 3.2 | 3.2 |
| rutherfordium-259 | 3.2 | 3.2 |
| oxygen-21 | 3.42 | 3.42 |
| astatine-200m2 | 3.5 | 3.5 |
| radium-210 | 3.7 | 3.7 |
| francium-205 | 3.80 | 3.80 |
| radon-201m | 3.8 | 3.8 |
| radon-219 | 3.96 | 3.96 |
| rutherfordium-261m | 4 | 4 |
| lead-185m | 4.07 | 4.07 |
| rutherfordium-257m | 4.1 | 4.1 |
| lawrencium-258 | 4.1 | 4.1 |
| fluorine-21 | 4.158 | 4.158 |
| nitrogen-17 | 4.173 | 4.173 |
| copernicium-283 | 4.2 | 4.2 |
| astatine-198 | 4.2 | 4.2 |
| nihonium-285 | 4.2 | 4.2 |
| fermium-245 | 4.2 | 4.2 |
| fluorine-22 | 4.23 | 4.23 |
| meitnerium-278 | 4.5 | 4.5 |
| dubnium-258 | 4.5 | 4.5 |
| dubnium-261 | 4.5 | 4.5 |
| roentgenium-280 | 4.6 | 4.6 |
| radium-209 | 4.6 | 4.6 |
| polonium-195 | 4.64 | 4.64 |
| rutherfordium-257 | 4.7 | 4.7 |
| lead-186 | 4.82 | 4.82 |
| actinium-222 | 5.0 | 5.0 |
| francium-232 | 5 | 5 |
| polonium-196 | 5.56 | 5.56 |
| einsteinium-240 | 6 | 6 |
| lawrencium-259 | 6.2 | 6.2 |
| bismuth-190m1 | 6.2 | 6.2 |
| lead-203m1 | 6.21 | 6.21 |
| bismuth-190 | 6.3 | 6.3 |
| lead-185 | 6.3 | 6.3 |
| astatine-199 | 6.92 | 6.92 |
| radon-201 | 7.0 | 7.0 |
| mendelevium-248 | 7 | 7 |
| nitrogen-16 | 7.13 | 7.13 |
| bismuth-198m2 | 7.7 | 7.7 |
| meitnerium-278 | 8 | 8 |
| seaborgium-265 | 8 | 8 |
| actinium-214 | 8.2 | 8.2 |
| bismuth-219 | 8.7 | 8.7 |
| hassium-270 | 9 | 9 |
| bismuth-220 | 9.5 | 9.5 |
| nihonium-286 | 9.5 | 9.5 |
| radon-202 | 9.94 | 9.94 |
| bohrium-272 | 10 | 10 |
| hassium-271 | 10 | 10 |
| einsteinium-241 | 10 | 10 |
| fluorine-20 | 11.07 | 11.07 |
| radon-229 | 12 | 12 |
| bismuth-191 | 12.3 | 12.3 |
| darmstadtium-281 | 12.7 | 12.7 |
| radium-212 | 13.0 | 13.0 |
| radium-211 | 13 | 13 |
| lawrencium-254 | 13 | 13 |
| einsteinium-242 | 13.5 | 13.5 |
| oxygen-20 | 13.51 | 13.51 |
| beryllium-11 | 13.81 | 13.81 |
| darmstadtium-281 | 14 | 14 |
| francium-207 | 14.8 | 14.8 |
| lead-218 | 15 | 15 |
| lead-187 | 15.2 | 15.2 |
| francium-206m1 | 15.9 | 15.9 |
| francium-206 | 16 | 16 |
| hassium-269 | 16 | 16 |
| seaborgium-265m | 16.2 | 16.2 |
| bohrium-267 | 17 | 17 |
| roentgenium-281 | 17 | 17 |
| neon-19 | 17.22 | 17.22 |
| francium-231 | 17.6 | 17.6 |
| lead-187m | 18.3 | 18.3 |
| berkelium-234 | 19 | 19 |
| francium-230 | 19.1 | 19.1 |
| carbon-10 | 19.29 | 19.29 |
| lead-217 | 20 | 20 |
| radon-227 | 20.8 | 20.8 |
| einsteinium-243 | 21 | 21 |
| berkelium-233 | 21 | 21 |
| berkelium-236 | 22 | 22 |
| lawrencium-255 | 22 | 22 |
| sodium-21 | 22.49 | 22.49 |
| rutherfordium-266 | 23 | 23 |
| mendelevium-249 | 24 | 24 |
| nobelium-257 | 25 | 25 |
| polonium-211m1 | 25.2 | 25.2 |
| lead-188 | 25.5 | 25.5 |
| polonium-197m | 25.8 | 25.8 |
| oxygen-19 | 26.464 | 26.464 |
| radon-203m | 26.7 | 26.7 |
| curium-233 | 27 | 27 |
| lawrencium-256 | 27 | 27 |
| francium-220 | 27.4 | 27.4 |
| copernicium-285 | 28 | 28 |
| radium-221 | 28 | 28 |
| dubnium-263 | 29 | 29 |
| copernicium-285 | 30 | 30 |
| radium-234 | 30 | 30 |
| radium-233 | 30 | 30 |
| radium-221 | 30 | 30 |
| fermium-247 | 31 | 31 |
| americium-230 | 32 | 32 |
| bismuth-218 | 33 | 33 |
| bismuth-192 | 34.6 | 34.6 |
| francium-213 | 34.6 | 34.6 |
| dubnium-262 | 35 | 35 |
| fermium-248 | 35.1 | 35.1 |
| bismuth-215m | 36.9 | 36.9 |
| einsteinium-244 | 37 | 37 |
| neon-23 | 37.24 | 37.24 |
| radium-222 | 38.0 | 38.0 |
| francium-228 | 38 | 38 |
| bismuth-192m | 39.6 | 39.6 |
| polonium-220 | 40 | 40 |
| bohrium-274 | 40 | 40 |
| astatine-200 | 43.2 | 43.2 |
| actinium-234 | 44 | 44 |
| radon-203 | 44.2 | 44.2 |
| polonium-203m1 | 45 | 45 |
| polonium-212m | 45.1 | 45.1 |
| hassium-271 | 46 | 46 |
| astatine-200m1 | 47 | 47 |
| francium-226 | 49 | 49 |
| francium-209 | 50.0 | 50.0 |
| astatine-223 | 50 | 50 |
| francium-229 | 50.2 | 50.2 |
| lead-189m1 | 50.5 | 50.5 |
| nobelium-254 | 51 | 51 |
| lead-189 | 51 | 51 |
| curium-234 | 52 | 52 |
| mendelevium-250 | 52 | 52 |
| polonium-197 | 53.6 | 53.6 |
| astatine-222 | 54 | 54 |
| radon-220 | 55.6 | 55.6 |
| astatine-219 | 56 | 56 |
| francium-208 | 59.1 | 59.1 |
| sodium-25 | 59.1 | 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 |
| 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 | 1.70 | 102 |
| 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 |
| bohrium-270 | 2.4 | 140 |
| 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 |
| titanium-51 | 5.76 | 346 |
| 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 |
| seaborgium-267 | 9.8 | 590 |
| americium-235 | 9.9 | 590 |
| nitrogen-13 | 9.965 | 597.9 |
| berkelium-253 | 10 | 600 |
| mercury-210 | 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 |

## 10$^3$ seconds (kiloseconds)

| isotope | half-life | half-life |
| isotope | minutes | 10$^3$ 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 |
| chlorine-38 | 37.24 | 2.234 |
| thorium-236 | 37.5 | 2.25 |
| protactinium-227 | 38.3 | 2.30 |
| americium-246 | 39 | 2.3 |
| uranium-241 | 40 | 2.4 |
| 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 |
| mercury-191 | 49 | 2.9 |
| 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 | 10$^3$ 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 |
| yttrium-85 | 2.68 | 9.6 |
| 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 |
| dysprosium-153 | 6.4 | 23 |
| 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 | 10$^3$ 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 |
| terbium-153 | 2.34 | 202 |
| 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 | 4.16 | 359 |
| iodine-124 | 4.17 | 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 |
| gadolinium-149 | 9.28 | 802 |
| actinium-225 | 10.0 | 860 |
| plutonium-246 | 10.84 | 937 |
| radium-223 | 11.43 | 988 |

## 10$^6$ seconds (megaseconds)

| isotope | half-life | half-life |
| isotope | days | 10$^6$ 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 |
| gadolinium-153 | 240.4 | 20.77 |
| 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 |
| samarium-145 | 340 | 29 |
| | years | 10$^6$ 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 | 91.5 |
| rhodium-101 | 3.3 | 100 |
| cobalt-60 | 5.2714 | 166.35 |
| radium-228 | 5.75 | 181 |
| barium-133 | 10.74 | 339 |
| 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 |
| promethium-145 | 17.711 | 558.9 |
| 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 |

## 10$^9$ seconds (gigaseconds)

| isotope | half-life | half-life |
| isotope | years | 10$^9$ 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 | 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 |

## 10$^{12}$ seconds (teraseconds)

| isotope | half-life | half-life |
| isotope | millennia | 10$^{12}$ 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 |
| | 10$^6$ years | 10$^{12}$ 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 |

## 10$^{15}$ seconds (petaseconds)

| isotope | half-life | half-life |
| isotope | 10$^6$ years | 10$^{15}$ seconds |
| niobium-92 | 34.724 | 1.0958 |
| plutonium-244 | 81.33 | 2.567 |
| samarium-146 | 92.026 | 2.9041 |
| uranium-235 | 703.8 | 22.21 |
| | 10$^9$ years | 10$^{15}$ seconds |
| potassium-40 | 1.251 | 39.5 |
| uranium-238 | 4.468 | 141.0 |
| thorium-232 | 14.05 | 443 |

## 10$^{18}$ seconds (exaseconds)

| isotope | half-life | half-life |
| isotope | 10$^9$ years | 10$^{18}$ 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 | 483 | 15.2 |

## 10$^{21}$ seconds (zettaseconds)

| isotope | half-life | half-life |
| isotope | 10$^{12}$ years | 10$^{21}$ seconds |
| osmium-184 | 11.2 | 0.35 |
| gadolinium-152 | 108 | 3.4 |
| indium-115 | 441 | 13.9 |
| | 10$^{15}$ years | 10$^{21}$ seconds |
| osmium-186 | 2.002 | 63.2 |
| neodymium-144 | 2.292 | 72.3 |
| samarium-148 | 7.005 | 221.1 |
| cadmium-113 | 7.7 | 240 |

## 10$^{24}$ seconds (yottaseconds)

| isotope | half-life | half-life |
| isotope | 10$^{15}$ years | 10$^{24}$ seconds |
| hafnium-174 | 70 | 2.2 |
| vanadium-50 | 140 | 4.4 |
| | 10$^{18}$ years | 10$^{24}$ 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 |

## 10$^{27}$ seconds (ronnaseconds)

| isotope | half-life | half-life |
| isotope | 10$^{21}$ years | 10$^{27}$ seconds |
| selenium-82 | 0.0975 | 3.08 |
| 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 |

## 10$^{30}$ seconds (quettaseconds)

| isotope | half-life | half-life |
| isotope | 10$^{24}$ years | 10$^{30}$ seconds |
| tellurium-128 | 2.2 | 69 |
The half-life of tellurium-128 is over 160 trillion times greater than the age of the universe, which is 4.35×10$^{17}$ seconds.