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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.

10⁻²⁴ seconds (yoctoseconds)

isotope	half-life
10−24 seconds
hydrogen-5
lithium-4
hydrogen-4
nitrogen-10
oxygen-11
helium-10
hydrogen-6
lithium-5
fluorine-14
boron-7
nitrogen-11
helium-5
beryllium-16
oxygen-28	≥650
hydrogen-7
nitrogen-11m
boron-21
neon-15
beryllium-15
boron-20
beryllium-11m
fluorine-30	960(410)

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
oxygen-27	≥2.5
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
oxygen-25	5.18
helium-9	7
fluorine-16	11
fluorine-28	46
boron-9	845

10⁻¹⁸ seconds (attoseconds)

isotope	half-life
10−18 seconds
nitrogen-9
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(3.3)
magnesium-19	5(3)
argon-30
potassium-31
sodium-22m2	19.6

10⁻⁹ seconds (nanoseconds)

isotope	half-life
10−9 seconds
helium-2
tellurium-104
lithium-12
boron-18
protactinium-219	53
neon-34	60
sodium-37	60
protactinium-220	69
actinium-217	69
francium-215	86
lead-196
uranium-236	100
bismuth-199	100
curium-247	100.6
actinium-218	103
francium-214	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
fluorine-18m	162(7)
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
uranium-239m1	250
bismuth-197m4	253
nitrogen-25	260
fluorine-31	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
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
fluorine-26m	2.2(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

10⁰ seconds

isotope	half-life
seconds	minutes	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
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
meitnerium-278	8
seaborgium-265	8
actinium-214	8.2
bismuth-219	8.7
hassium-270	9
bismuth-220	9.5
nihonium-286	9.5
radon-202	9.94
bohrium-272	10
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
darmstadtium-281	14
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
copernicium-285	30
radium-234	30
radium-233	30
radium-221	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
hassium-271	46
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
californium-239	60 s
actinium-235	60 s
lead-201m1	61 s
bohrium-270	61 s
neptunium-228	61.4 s
actinium-222m	1.05 min
californium-240	1.06 min
fluorine-17	64.49 s
radon-228	65 s
uranium-227	1.1 min
einsteinium-245	1.1 min
bismuth-193	67 s
radon-204	1.17 min
protactinium-234m	1.17 min
oxygen-14	70.62 s
lead-190	71 s
actinium-236	72 s
rutherfordium-261	78 s
americium-232	79 s
lead-191	1.33 min
seaborgium-267	1.4 min
astatine-201	85 s
bismuth-195m1	87 s
bismuth-194	95 s
fermium-249	1.6 min
nobelium-253	1.62 min
bismuth-217	98.5 s
lead-216	1.65 min
roentgenium-282	102 s
plutonium-230	1.70 min
radium-231	103 s
polonium-198	1.77 min
protactinium-226	1.8 min
berkelium-252	1.8 min
neptunium-243	1.85 min
bismuth-194m2	115 s
actinium-232	119 s
protactinium-240	2 min
plutonium-229	120 s
actinium-230	122 s
oxygen-15	122.24 s
bismuth-194m1	125 s
actinium-223	2.10 min
bismuth-211	2.14 min
bismuth-216	2.17 min
lead-191m	2.18 min
polonium-221	2.2 min
neptunium-242	2.2 min
protactinium-238	2.27 min
neptunium-244	2.29 min
mendelevium-252	2.30 min
astatine-221	2.3 min
americium-234	2.32 min
lead-215	2.34 min
berkelium-238	2.40 min
bohrium-270	2.4 min
seaborgium-271	2.4 min
actinium-233	145 s
francium-227	2.47 min
astatine-224	2.5 min
lawrencium-260	2.7 min
radon-205	170 s
astatine-202m1	182 s
bismuth-195	183 s
astatine-202	184 s
polonium-218	3.10 min
francium-211	3.10 min
nobelium-255	3.1 min
francium-210	3.18 min
americium-233	3.2 min
francium-224	3.33 min
neon-24	203 s
californium-242	3.49 min
lead-192	3.5 min
americium-236	3.6 min
astatine-220	3.71 min
californium-241	3.78 min
radium-229	4.0 min
mendelevium-251	4.0 min
francium-225	4.0 min
neptunium-229	4.0 min
bismuth-196m2	4.00 min
radium-232	250 s
polonium-199m	4.17 min
einsteinium-247	4.55 min
berkelium-241	4.6 min
neptunium-230	4.6 min
radon-225	4.66 min
berkelium-240	4.8 min
thorium-237	4.8 min
francium-221	4.9 min
curium-235	5 min
lead-193	5 min
bismuth-197m1	5.04 min
bismuth-196	5.1 min
polonium-199	5.48 min
neptunium-242m	5.5 min
radon-206	5.67 min
titanium-51	5.76 min
lead-193m1	5.8 min
bismuth-216m	6.6 min
curium-236	6.8 min
berkelium-242	7.0 min
bismuth-212m2	7.0 min
thorium-235	7.2 min
neptunium-240m	7.22 min
astatine-203	7.37 min
radon-226	7.4 min
actinium-231	7.5 min
bismuth-215	7.6 min
einsteinium-246	7.7 min
lead-197	8.1 min
plutonium-231	8.6 min
protactinium-237	8.7 min
thorium-225	8.72 min
polonium-201m	8.9 min
protactinium-236	9.1 min
polonium-222	9.1 min
uranium-228	9.1 min
astatine-204	9.2 min
radon-207	9.25 min
bismuth-197	9.33 min
thorium-238	9.4 min
copper-62	9.673 min
seaborgium-267	9.8 min
americium-235	9.9 min
nitrogen-13	9.965 min
berkelium-253	10 min
mercury-210	10 min
mendelevium-254	10 min
[free] neutron,	609.6 s
lead-213	10.2 min
bismuth-198	10.3 min
polonium-219	10.3 min
californium-243	10.7 min
polonium-200	11.5 min
bismuth-198m1	11.6 min
lead-194	12.0 min
mendelevium-253	12 min
lead-199m1	12.2 min
californium-256	12.3 min
neptunium-241	13.9 min
seaborgium-269	14 min
francium-222	14.2 min
neptunium-232	14.7 min
lead-195m1	15.0 min
rutherfordium-263	15 min
lead-195	~15	~900
polonium-201	15.3 min

10³ seconds (kiloseconds)

isotope	half-life	minutes	103 seconds	hours	103 seconds	days	103 seconds
curium-251	16.8 min
uranium-242	16.8 min
californium-244	19.4 min
bismuth-214	19.9 min
francium-212	20.0 min
curium-237	20 min
carbon-11	20.334 min
plutonium-233	20.9 min
thorium-233	21.83 min
francium-223	22.00 min
americium-247	23.0 min
uranium-239	23.45 min
radon-212	23.9 min
radon-223	24.3 min
radon-208	24.35 min
protactinium-235	24.44 min
bismuth-199m1	24.70 min
bismuth-212m1	25.0 min
americium-246m1	25.0 min
plutonium-235	25.3 min
einsteinium-256	25.4 min
radon-221	25.7 min
americium-244m	26 min
uranium-235m	26 min
astatine-205	26.2 min
lead-214	26.8 min
mendelevium-255	27 min
bismuth-199	27 min
einsteinium-248	27 min
mendelevium-254m	28 min
radon-209	28.5 min
fermium-250	30.4 min
thorium-226	30.57 min
astatine-206	30.6 min
bismuth-200m1	31 min
plutonium-232	33.7 min
lead-211	36.1 min
neptunium-233	36.2 min
bismuth-200	36.4 min
polonium-203	36.7 min
lead-196	37 min
chlorine-38	37.24 min
thorium-236	37.5 min
protactinium-227	38.3 min
americium-246	39 min
uranium-241	40 min
radium-227	42.2 min
lead-197m1	42.9 min
lawrencium-261	44 min
polonium-202	44.7 min
californium-245	45.0 min
bismuth-213	45.59 min
neptunium-231	48.8 min
mercury-191	49 min
berkelium-251	55.6 min
mendelevium-258m	57.0 min
uranium-229	58 min
nobelium-259	58 min
bismuth-201m1	59.1 min
dubnium-270	1.0 h
bismuth-212	1.0092 h
neptunium-240	1.032 h
actinium-229	1.045 h
curium-249	1.0692 h
lead-204m2	1.12 h
gallium-68	1.1285 h
americium-237	1.22 h
mendelevium-256	1.283 h
rutherfordium-267	1.3 h
dubnium-266	1.33 h
californium-255	1.417 h
lead-199	1.50 h
radium-230	1.55 h
mendelevium-259	1.60 h
americium-238	1.63 h
astatine-208	1.63 h
polonium-205	1.66 h
einsteinium-249	1.703 h
bismuth-202	1.72 h
astatine-207	1.80 h
bismuth-201	1.80 h
protactinium-239	1.8 h
fluorine-18	1.8295 h
americium-245	2.05 h
einsteinium-250m	2.22 h
radon-210	2.4 h
lead-198	2.4 h
curium-238	2.4 h
curium-239	2.5 h
fermium-256	2.627 h
yttrium-85	2.68 h
actinium-224	2.78 h
californium-247	3.11 h
berkelium-250	3.212 h
fermium-254	3.240 h
lead-209	3.253 h
lead-202m1	3.53 h
polonium-204	3.53 h
lawrencium-262	3.6 h
berkelium-244	4.35 h
berkelium-243	4.5 h
dubnium-267	4.6 h
plutonium-243	4.956 h
fermium-251	5.30 h
polonium-207	5.80 h
astatine-209	5.41 h
mendelevium-257	5.52 h
actinium-228	6.13 h
dysprosium-153	6.4 h
protactinium-234	6.70 h
astatine-211	7.214 h
einsteinium-256m	7.6 h
astatine-210	8.1 h
einsteinium-250	8.6 h
plutonium-234	8.8 h
lead-201	9.33 h
americium-244	10.1 h
erbium-165	10.36 h
plutonium-245	10.5 h
lead-212	10.64 h
lawrencium-266	11 h
bismuth-204	11.22 h
bismuth-203	11.76 h
americium-239	11.9 h
uranium-240	14.1 h
radon-211	14.6 h
sodium-24	14.96 h
americium-242	16.02 h
fermium-255	20.07 h
lead-200	21.5 h
protactinium-228	22 h
neptunium-236m	22.5 h
berkelium-248m	23.7 h
fermium-252	1.058 d
thorium-231	1.0634 d
dubnium-268	1.283 d
erbium-160	1.191 d
actinium-226	1.2238 d
protactinium-232	1.31 d
einsteinium-251	1.375 d
californium-246	1.4875 d
protactinium-229	1.50 d
einsteinium-255	1.6375 d
berkelium-246	1.80 d
neptunium-238	2.117 d
americium-240	2.117 d
lead-203	2.16138 d
plutonium-247	2.27 d
terbium-153	2.34 d
neptunium-239	2.356 d
gold-198	2.695 d
fermium-253	3.00 d
gold-199	3.169 d
radium-224	3.6319 d
radon-222	3.8235 d
uranium-231	4.16 d
iodine-124	4.17 d
neptunium-234	4.4 d
calcium-47	4.536 d
berkelium-245	4.94 d
bismuth-210	5.012 d
manganese-52	5.591 d
gold-196	6.183 d
bismuth-206	6.243 d
uranium-237	6.75 d
einsteinium-257	7.7 d
iodine-131	8.02 d
polonium-206	8.8 d
thulium-167	9.25 d
gadolinium-149	9.28 d
actinium-225	10.0 d
plutonium-246	10.84 d
radium-223	11.43 d

10⁶ seconds (megaseconds)

isotope	half-life	days	106 seconds	years	106 seconds
phosphorus-32	14.29 d
radium-225	14.9 d
bismuth-205	15.31 d
vanadium-48	15.9735 d
protactinium-230	17.4 d
californium-253	17.81 d
thorium-227	18.68 d
einsteinium-253	20.47 d
uranium-230	20.8 d
thorium-234	24.10 d
protactinium-233	26.975 d
curium-240	27 d
chromium-51	27.7025 d
mendelevium-260	27.8 d
curium-241	32.8 d
einsteinium-255	39.8 d
plutonium-237	45.2 d
mendelevium-258	51.5 d
beryllium-7	53.12 d
californium-254	60.5 d
cobalt-56	77.27 d
scandium-46	83.79 d
sulfur-35	87.32 d
thulium-168	93.1 d
fermium-257	100.5 d
thulium-170	128.6 d
polonium-210	138.376 d
calcium-45	162.7 d
curium-242	162.8 d
gold-195	186.1 d
gadolinium-153	240.4 d
zinc-65	243.7 d
cobalt-57	271.79 d
einsteinium-254	275.7 d
vanadium-49	330 d
berkelium-249	330 d
californium-248	333.5 d
samarium-145	340 d
ruthenium-106	1.023 yr
neptunium-235	1.0845 yr
cadmium-109	1.267 yr
einsteinium-252	1.2915 yr
thorium-228	1.9116 yr
thulium-171	1.92 yr
caesium-134	2.0652 yr
sodium-22	2.602 yr
californium-252	2.645 yr
iron-55	2.756 yr
plutonium-236	2.858 yr
polonium-208	2.898 yr
rhodium-101	3.3 yr
cobalt-60	5.2714 yr
radium-228	5.75 yr
barium-133	10.74 yr
krypton-85	10.756 yr
hydrogen-3
(also known as tritium)	12.32 yr
californium-250	13.08 yr
plutonium-241	14.290 yr
niobium-93m	16.13 yr
promethium-145	17.711 yr
curium-244	18.10 yr
actinium-227	21.772 yr
lead-210	22.3 yr
strontium-90	28.79 yr
curium-243	29.1 yr
caesium-137	30.17 yr

10⁹ seconds (gigaseconds)

isotope	half-life	years
bismuth-207	32.9 yr
titanium-44	63 yr
uranium-232	68.9 yr
gadolinium-148	86.9 yr
plutonium-238	87.7 yr
samarium-151	96.6 yr
nickel-63	100.1 yr
polonium-209	125.2 yr
americium-242m1	141 yr
silicon-32	170 yr
argon-39	269 yr
berkelium-248	300	9.5
californium-249	351 yr
silver-108m	418 yr
americium-241	432.2 yr
mercury-194	444 yr
niobium-91	680 yr
californium-251	900 yr
holmium-166m1	1200 yr
berkelium-247	1380 yr
radium-226	1600 yr
molybdenum-93	4000 yr
holmium-163	4570 yr
curium-246	4760 yr
carbon-14	5730 yr
plutonium-240	6561 yr
thorium-229	7340 yr
americium-243	7370 yr
curium-250	8300 yr
curium-245	8500 yr
niobium-94	20300 yr
plutonium-239	24110 yr

10¹² seconds (teraseconds)

isotope	half-life	millennia	1012 seconds	106 years	1012 seconds
protactinium-231	32.76 yr
lead-202	52.5 yr
lanthanum-137	60 yr
thorium-230	75.38 yr
nickel-59	76 yr
calcium-41	103 yr
neptunium-236	154 yr
uranium-233	159.2 yr
rhenium-186m	200 yr
technetium-99	211.1 yr
krypton-81	229 yr
tin-126	230 yr
uranium-234	245.5 yr
chlorine-36	301 yr
selenium-79	327 yr
curium-248	348 yr
bismuth-208	368 yr
plutonium-242	375 yr
aluminium-26	717 yr
beryllium-10	1.39 yr
zirconium-93	1.53 yr
gadolinium-150	1.79 yr
neptunium-237	2.144 yr
caesium-135	2.3 yr
iron-60	2.6 yr
technetium-97	2.6 yr
dysprosium-154	3.0 yr
bismuth-210m	3.04 yr
manganese-53	3.7 yr
technetium-98	4.2 yr
palladium-107	6.5 yr
hafnium-182	8.9 yr
lead-205	17.3 yr
curium-247	15.6 yr
iodine-129	15.7 yr
uranium-236	23.42 yr

10¹⁵ seconds (petaseconds)

isotope	half-life	106 years	1015 seconds	109 years	1015 seconds
niobium-92	34.724 yr
plutonium-244	81.33 yr
samarium-146	92.026 yr
uranium-235	703.8 yr
potassium-40	1.251 yr
uranium-238	4.468 yr
thorium-232	14.05 yr

10¹⁸ seconds (exaseconds)

isotope	half-life	109 years	1018 seconds
lutetium-176	37.64 yr
rhenium-187	41.22 yr
rubidium-87	49.72 yr
lanthanum-138	102.1 yr
samarium-147	106.1 yr
platinum-190	483 yr

10²¹ seconds (zettaseconds)

isotope	half-life	1012 years	1021 seconds	eons	1021 seconds
osmium-184	11.2 yr
gadolinium-152	108 yr
indium-115	441 yr
osmium-186	2.002 yr
neodymium-144	2.292 yr
samarium-148	7.005 yr
cadmium-113	7.7 yr

10²⁴ seconds (yottaseconds)

isotope	half-life	eons	1024 seconds	1018 years	1024 seconds
hafnium-174	70 yr
vanadium-50	140 yr
tungsten-180	1.801 yr
europium-151	5.004 yr
molybdenum-100	7.804 yr
neodymium-150	7.905 yr
tellurium-130	8.806 yr
zirconium-96	20 yr
bismuth-209	20.1 yr
calcium-48	23.01 yr
cadmium-116	31.02 yr

10²⁷ seconds (ronnaseconds)

isotope	half-life	1021 years	1027 seconds
selenium-82	0.0975 yr
barium-130	1.2 yr
germanium-76	1.8 yr
xenon-136	2.165 yr
krypton-78	9.2 yr
xenon-124	18 yr

10³⁰ seconds (quettaseconds)

isotope	half-life	1024 years	1030 seconds
tellurium-128	2.25 yr

The half-life of tellurium-128 is over 160 trillion times greater than the age of the universe, which is seconds.

Notes

References

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.
"Periodic Table - Ptable".
(2023). "Discovery of New Isotope ²⁴¹U and Systematic High-Precision Atomic Mass Measurements of Neutron-Rich Pa-Pu Nuclei Produced via Multinucleon Transfer Reactions". Physical Review Letters.
Yirka, Bob. (April 5, 2023). "Previously unknown isotope of uranium discovered". [[Phys.org]].
"Accepted_HalfLives_Commonly_Used_Radioisotopes". UAB Radiation Safety.
{{chem. 14. C is used in [[radiocarbon dating]].
Walker, John. "Barely Radioactive Elements".
(June 2021). "Status and Perspectives on Rare Decay Searches in Tellurium Isotopes". Universe.

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List of radioactive nuclides by half-life

10−24 seconds (yoctoseconds)

10−21 seconds (zeptoseconds)

10−18 seconds (attoseconds)

10−12 seconds (picoseconds)

10−9 seconds (nanoseconds)

10−6 seconds (microseconds)

10−3 seconds (milliseconds)

100 seconds

103 seconds (kiloseconds)

106 seconds (megaseconds)

109 seconds (gigaseconds)

1012 seconds (teraseconds)

1015 seconds (petaseconds)

1018 seconds (exaseconds)

1021 seconds (zettaseconds)

1024 seconds (yottaseconds)

1027 seconds (ronnaseconds)

1030 seconds (quettaseconds)