List of nuclides

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This table of nuclides shows the 901 observed nuclides that either are stable or, if radioactive, have half-lives longer than one hour.

(A nuclide is defined conventionally as an experimentally examined bound collections of one or more protons and zero or more neutrons, that either is stable or has an observed decay mode.)

At least 3,000 nuclides have been experimentally characterized. Those not shown in this 901-member list all have decay half-lives less than 60 minutes.

Introduction[edit]

An additional row contains specific data on the type of decay of the nuclide. If a decay has been predicted theoretically but never observed experimentally, it is given in parentheses. Only 90 nuclides from the first 40 elements are theoretically (energetically) stable to any kind of radioactive decay (save proton decay, which has not been observed). Another 164 nuclides are in theory subject to known types of decay processes such as spontaneous fission, alpha decay, double beta decay, etc., but for which decay has not been observed. Some of these are indicated with a ">" number to show the lower time limit of the half-life known based on experimental observation. Such nuclides are considered to be "stable" until a half-life for their decay has been measured in some fashion, and thus a half-life is known.

The next group is the radioactive primordial nuclides. Presently known are 34 of these, of which 29 have half-lives considerably longer than the age of the universe. Tellurium-123 most recently had been reported to be radioactive, but the same experimental group later retracted this report, and it presently remains observationally stable.

About 50 nuclides have half-lives too short to be primordial, but are nevertheless found in nature as a result of later production by natural processes. These are daughters of longer-lived nuclides (radiogenic nuclides), cosmic-ray reaction products (cosmogenic nuclides), or products of other natural nuclear reactions (nucleogenic nuclides).

The remaining radionuclides presented are artificially produced. Some, such as caesium-137, are found in the environment only as a result of contamination from man-made nuclear fission product releases (nuclear weapons, nuclear reactors, and other processes).

All the radionuclides, starting with the longest-lived primordial radionuclides, are presented sorted by decreasing half-life. All half-lives in the list are given in seconds. For more convenient units, they must be divided by the corresponding number of seconds in the time unit (for example, nuclides with half-lives over 108 seconds must be divided by 31,556,926 to obtain half-life in years).

Some 164 of the 254 so-called stable nuclides are presumed to be unstable with a very long half-life, and thus a radioactive decay has not yet been experimentally measured, but might reported at any time. A total of 254 nuclides are classified as "stable" (no decay experimentally observed and thus no experimental half-life yet determined). An additional 34 primordial radionuclides are known.

The total list of 288 primordial nuclides, starting with the stable nuclides and ending with the longest-lived radioactive nuclide found in nature that is not the daughter product of a longer-lived decay, ends with the shortest-half-lived primordial nuclide, 244Pu, at position 288.

Summary table for numbers of each class of nuclides[edit]

This is a summary table[1] of decay class for the 901 nuclides with half-lives longer than one hour, given in this list of nuclides. Note that numbers should not be considered perfectly exact, and may change slightly in the future, as nuclides radioactive only in theory are observed to be radioactive, or new half-lives are determined enough precision to give them as an experimental figure.

Only 90 of these 901 nuclides are, in theory, stable,[citation needed] except to proton-decay (which has never been observed). An additional 164 nuclides are in theory unstable[citation needed] but have never been observed to decay. This total of 254 nuclides are classically considered stable, but the number of subject to change as various long-lived nuclides among the 164 are in fact determined to be radioactive.

The remaining 641 radionuclides with half-lives longer than 1 hour, have half-lives that are well-characterized. They include 29 nuclides with measured half-lives longer than the estimated age of the universe (13.8 billion years), and another 5 nuclides with half-lives long enough (> 80 million years) that they are still primordial, and may be detected on Earth, having survived from their presence in interstellar dust since before the formation of the solar system, about 4.6 billion years before the present. Together, these constitute the known 34 radioactive primordial nuclides.

Another ~51 short-lived nuclides can be detected naturally as daughters of longer-lived nuclides (radiogenic nuclides), cosmic-ray reaction products (cosmogenic nuclides), or products of other natural nuclear reactions (nucleogenic nuclides). This gives a total of about ~ 339 naturally occurring nuclides. The remaining known nuclides listed, are known solely from artificial nuclear transmutation.

Stability class Number of nuclides Running total Notes on running total
In theory, stable to all but proton decay 90 90 Includes first 40 elements. Proton decay yet to be observed.
Energetically unstable to one or more known decay modes, but no decay yet seen. All considered "stable" until decay detected. 164 254 Total of classically stable nuclides.
Radioactive primordial nuclides. 34 288 Total primordial elements include bismuth, uranium, thorium, plutonium, plus all stable nuclides.
Radioactive non-primordial, but naturally occurring on Earth. ~ 51 ~ 339 Carbon-14 (and other isotopes generated by cosmic rays); daughters of radioactive primordials, such as francium, etc.
Radioactive synthetic (half-life > 1 hour). Includes most useful radiotracers. >562 >901 The 901 nuclides with half-life >1h are listed in this article; there are some more short-lived natural isotopes.
Radioactive synthetic (half-life < 1 hour). >2400 >3300 Includes all well-characterized synthetic nuclides.

List legends[edit]

no (number)

A running positive integer for reference. Especially for nuclides with short half-lives, this number, i.e. position in this table, might be changed in the future.

nuclide column

nuclide identifiers are given by their mass number A and the symbol for the corresponding chemical element (implies a unique proton number). In the rare case that this is not the ground state, this is indicated by a m for metastable appended to the mass number.

energy column

The column labeled "energy" denotes the energy equivalent of the difference between the mass per nucleon of this nuclide and the mass of a neutron (so all nuclides get a positive value) in MeV, formally: mnmnuclide / A.

half-life column

All times are given in seconds (3.1556926×107 s = 1 year). Entries starting with a > indicates that only lower limits for the half-life were established. Such elements are formally still considered "stable" until a half-life can be determined.

decay mode column
α α decay
β β decay
ε electron capture
β+ β+ decay
SF spontaneous fission
ββ double β decay
β+β+ double β+ decay
IT isomeric transition
p proton emission
n neutron emission

Decay modes in parentheses are still not observed through experiment but are, by their energy, predicted to occur.

decay energy column

Multiple values for (maximal) decay energy are mapped to decay modes in their order. The decay energy listed is for the specific nuclide only, not for the whole decay chain. It includes the energy lost to neutrinos.

Stable nuclides[edit]

In theory, spontaneous fission is possible for all elements with atomic numbers >40,[citation needed] but has not been observed for most elements up to lead (82). The list separates nuclides unstable only to this fission mechanism, from the rest of the nuclides following, which are unstable to additional mechanisms.

no nuclide A Z N energy half-life decay mode decay energy (Mev)
1 56Fe 56 26 30 9.153567
2 62Ni 62 28 34 9.147877
3 60Ni 60 28 32 9.145862
4 58Fe 58 26 32 9.142938
5 52Cr 52 24 28 9.137037
6 57Fe 57 26 31 9.127119
7 59Co 59 27 32 9.126046
8 54Cr 54 24 30 9.125633
9 61Ni 61 28 33 9.124129
10 55Mn 55 25 30 9.120611
11 64Ni 64 28 36 9.119754
12 66Zn 66 30 36 9.115258
13 53Cr 53 24 29 9.114435
14 63Cu 63 29 34 9.112272
15 65Cu 65 29 36 9.106154
16 68Zn 68 30 38 9.100845
17 50Ti 50 22 28 9.099861
18 51V 51 23 28 9.094884
19 67Zn 67 30 37 9.084468
20 48Ti 48 22 26 9.081488
21 72Ge 72 32 40 9.079465
22 70Ge 70 32 38 9.079372
23 69Ga 69 31 38 9.076078
24 88Sr 88 38 50 9.070438
25 74Ge 74 32 42 9.063522
26 49Ti 49 22 27 9.062323
27 76Se 76 34 42 9.061485
28 71Ga 71 31 40 9.059218
29 78Se 78 34 44 9.058842
30 90Zr 90 40 50 9.057631
31 89Y 89 39 50 9.056743
32 86Sr 86 38 48 9.054160
33 82Kr 82 36 46 9.054126
34 84Kr 84 36 48 9.052649
35 73Ge 73 32 41 9.048006
36 87Sr 87 38 49 9.046964
37 75As 75 33 42 9.045093
38 80Kr 80 36 44 9.044984
39 77Se 77 34 43 9.040153
40 85Rb 85 37 48 9.037998
41 91Zr 91 40 51 9.037156
42 83Kr 83 36 47 9.034966
43 79Br 79 35 44 9.034220
44 81Br 81 35 46 9.033979
45 92Zr 92 40 52 9.032783
46 46Ti 46 22 24 9.030532
47 47Ti 47 22 25 9.027336
48 44Ca 44 20 24 9.013793
49 42Ca 42 20 22 8.989116
50 38Ar 38 18 20 8.984870
51 45Sc 45 21 24 8.983945
52 43Ca 43 20 23 8.964551
53 34S 34 16 18 8.951675
54 40Ar 40 18 22 8.947325
55 41K 41 19 22 8.938623
56 39K 39 19 20 8.938174
57 37Cl 37 17 20 8.929760
58 36S 36 16 20 8.923108
59 35Cl 35 17 18 8.900285
60 30Si 30 14 16 8.885761
61 32S 32 16 16 8.884318
62 33S 33 16 17 8.876964
63 31P 31 15 16 8.859744
64 28Si 28 14 14 8.838935
65 29Si 29 14 15 8.826327
66 27Al 27 13 14 8.708242
67 26Mg 26 12 14 8.694981
68 24Mg 24 12 12 8.651911
69 25Mg 25 12 13 8.599047
70 23Na 23 11 12 8.485675
71 22Ne 22 10 12 8.436087
72 20Ne 20 10 10 8.423422
73 16O 16 8 8 8.367390
74 21Ne 21 10 11 8.344280
75 19F 19 9 10 8.149612
76 17O 17 8 9 8.118904
77 18O 18 8 10 8.114744
78 12C 12 6 6 8.071327
79 15N 15 7 8 8.064594
80 14N 14 7 7 7.866827
81 13C 13 6 7 7.830943
82 4He 4 2 2 7.465077
83 11B 11 5 6 7.283337
84 10B 10 5 5 6.866257
85 9Be 9 4 5 6.810483
86 7Li 7 3 4 5.941599
87 6Li 6 3 3 5.723527
88 3He 3 2 1 3.094327
89 2H 2 1 1 1.503327
90 1H 1 1 0 0.782327
91 94Mo 94 42 52 9.011856 (SF) < 4.485
92 93Nb 93 41 52 9.009051 (SF) < 0.943
93 96Mo 96 42 54 8.996229 (SF) < 5.771
94 95Mo 95 42 53 8.994564 (SF) < 4.531
95 97Mo 97 42 55 8.973806 (SF) < 6.226
96 98Ru 98 44 54 8.971572 (SF) < 11.690
97 100Ru 100 44 56 8.963517 (SF) < 13.634
98 99Ru 99 44 55 8.956348 (SF) < 12.368
99 102Ru 102 44 58 8.944837 (SF) < 12.049
100 101Ru 101 44 57 8.942117 (SF) < 13.205
101 104Pd 104 46 58 8.930847 (SF) < 18.969
102 103Rh 103 45 58 8.925910 (SF) < 15.462
103 106Pd 106 46 60 8.919460 (SF) < 16.806
104 105Pd 105 46 59 8.913356 (SF) < 18.247
105 108Pd 108 46 62 8.900253 (SF) < 16.102
106 107Ag 107 47 60 8.897514 (SF) < 20.512
107 110Cd 110 48 62 8.892718 (SF) < 22.486
108 109Ag 109 47 62 8.885300 (SF) < 19.241
109 112Cd 112 48 64 8.880077 (SF) < 20.733
110 111Cd 111 48 63 8.875445 (SF) < 21.883
111 114Sn 114 50 64 8.865722 (SF) < 27.965
112 113In 113 49 64 8.862212 (SF) < 24.281
113 116Sn 116 50 66 8.860362 (SF) < 25.905
114 115Sn 115 50 65 8.854249 (SF) < 26.791
115 118Sn 118 50 68 8.848073 (SF) < 23.815
116 117Sn 117 50 67 8.843977 (SF) < 25.334
117 120Sn 120 50 70 8.830537 (SF) < 21.824
118 119Sn 119 50 69 8.828201 (SF) < 23.140
119 121Sb 121 51 70 8.811783 (SF) < 25.718
120 122Te 122 52 70 8.811606 (SF) < 30.974
121 124Te 124 52 72 8.801364 (SF) < 28.221
122 123Sb 123 51 72 8.796727 (SF) < 23.454
123 126Te 126 52 74 8.786126 (SF) < 26.011
124 125Te 125 52 73 8.783505 (SF) < 26.966
125 128Xe 128 54 74 8.773359 (SF) < 35.047
126 127I 127 53 74 8.771981 (SF) < 29.961
127 130Xe 130 54 76 8.762725 (SF) < 32.483
128 129Xe 129 54 75 8.758904 (SF) < 33.947
129 132Xe 132 54 78 8.747695 (SF) < 30.885
130 131Xe 131 54 77 8.746253 (SF) < 31.140
131 134Ba 134 56 78 8.735133 (SF) < 40.520
132 133Cs 133 55 78 8.733515 (SF) < 34.753
133 136Ba 136 56 80 8.724908 (SF) < 38.041
134 135Ba 135 56 79 8.722072 (SF) < 39.357
135 137Ba 137 56 81 8.711628 (SF) < 35.722
136 138Ba 138 56 82 8.710904 (SF) < 34.302
137 140Ce 140 58 82 8.700494 (SF) < 43.633
138 139La 139 57 82 8.698892 (SF) < 38.944
139 141Pr 141 59 82 8.681405 (SF) < 48.450
140 142Nd 142 60 82 8.676646 (SF) < 53.264
141 156Gd 156 64 92 8.536342 (SF) < 71.541
142 157Gd 157 64 93 8.522478 (SF) < 70.531
143 158Gd 158 64 94 8.518775 (SF) < 70.965
144 159Tb 159 65 94 8.508680 (SF) < 74.878
145 163Dy 163 66 97 8.478607 (SF) < 79.055
146 164Dy 164 66 98 8.473604 (SF) < 79.499
147 54Fe 54 26 28 9.113040 +β+) 0.6800
148 58Ni 58 28 30 9.109736 +β+) 1.9258
149 74Se 74 34 40 9.047175 +β+) 1.2094
150 80Se 80 34 46 9.043326 β) 0.1339
151 86Kr 86 36 50 9.039532 β) 1.2556
152 84Sr 84 38 46 9.031375 +β+) 1.7867
153 92Mo 92 42 50 9.014860 +β+) 1.6491
154 94Zr 94 40 54 8.999698 β) 1.1440
155 98Mo 98 42 56 8.970426 β) 0.1125
156 96Ru 96 44 52 8.967911 +β+) 2.7188
157 102Pd 102 46 56 8.933337 +β+) 1.1720
158 104Ru 104 44 60 8.918337 β) 1.2997
159 36Ar 36 18 18 8.911105 +β+) 0.4335
160 110Pd 110 46 64 8.874500 β) 1.9997
161 112Sn 112 50 62 8.862944 +β+) 1.9222
162 122Sn 122 50 72 8.808590 β) 0.3661
163 124Sn 124 50 74 8.782914 β) 2.2870
164 126Xe 126 54 72 8.779010 +β+) 0.8973
165 143Nd 143 60 83 8.658792 (α) 0.5214
166 144Sm 144 62 82 8.640577 +β+, α) 1.7811, 0.0761
167 145Nd 145 60 85 8.632963 (α) 1.5784
168 146Nd 146 60 86 8.625649 β, α) 0.0702, 1.1822
169 148Nd 148 60 88 8.594388 β, α) 1.9288, 0.5986
170 150Sm 150 62 88 8.585043 (α) 1.4495
171 152Sm 152 62 90 8.563227 (α) 0.2203
172 153Eu 153 63 90 8.550893 (α) 0.2736
173 154Gd 154 64 90 8.549985 (α) 0.0812
174 154Sm 154 62 92 8.541857 β) 1.2510
175 155Gd 155 64 91 8.536341 (α) 0.0812
176 156Dy 156 66 90 8.523443 +β+, α) 2.0108, 1.7579
177 158Dy 158 66 92 8.516973 +β+, α) 0.2833, 0.8748
178 160Dy 160 66 94 8.506816 (α) 0.4387
179 161Dy 161 66 95 8.494067 (α) 0.3443
180 162Dy 162 66 96 8.492234 (α) 0.0847
181 162Er 162 68 94 8.480852 +β+, α) 1.8445, 1.6460
182 164Er 164 68 96 8.473462 +β+, α) 0.0241, 1.3041
183 165Ho 165 67 98 8.464689 (α) 0.1394
184 166Er 166 68 98 8.462482 (α) 0.8309
185 167Er 167 68 99 8.450350 (α) 0.6657
186 168Er 168 68 100 8.446308 (α) 0.5527
187 168Yb 168 70 98 8.437845 +β+, α) 1.4221, 1.9508
188 169Tm 169 69 100 8.433931 (α) 1.2004
189 170Yb 170 70 100 8.428792 (α) 1.7376
190 170Er 170 68 102 8.424945 β, α) 0.6536, 0.0502
191 171Yb 171 70 101 8.418182 (α) 1.5589
192 172Yb 172 70 102 8.415864 (α) 1.3103
193 173Yb 173 70 103 8.404023 (α) 0.9459
194 174Yb 174 70 104 8.398624 (α) 0.7401
195 175Lu 175 71 104 8.386589 (α) 1.6197
196 176Hf 176 72 104 8.381427 (α) 2.2550
197 177Hf 177 72 105 8.370139 (α) 2.2449
198 178Hf 178 72 106 8.365958 (α) 2.0832
199 179Hf 179 72 107 8.353293 (α) 1.8065
200 180Hf 180 72 108 8.347930 (α) 1.2828
201 181Ta 181 73 108 8.338961 (α) 1.5259
202 185Re 185 75 110 8.308204 (α) 2.1947
203 187Os 187 76 111 8.291746 (α) 2.7202
204 188Os 188 76 112 8.290138 (α) 2.1426
205 189Os 189 76 113 8.277599 (α) 1.9757
206 190Os 190 76 114 8.275045 (α) 1.3784
207 191Ir 191 77 114 8.263508 (α) 2.0839
208 192Pt 192 78 114 8.260353 (α) 2.4181
209 192Os 192 76 116 8.258202 β, α) 0.4135, 0.3622
210 194Pt 194 78 116 8.250519 (α) 1.5045
211 193Ir 193 77 116 8.250259 (α) 1.0173
212 195Pt 195 78 117 8.239516 (α) 1.1581
213 196Pt 196 78 118 8.237896 (α) 0.7942
214 196Hg 196 80 116 8.233710 +β+, α) 0.8197, 2.0273
215 197Au 197 79 118 8.229404 (α) 0.9545
216 198Hg 198 80 118 8.227663 (α) 1.3833
217 198Pt 198 78 120 8.222378 β, α) 1.0472, 0.0870
218 199Hg 199 80 119 8.219805 (α) 0.8242
219 200Hg 200 80 120 8.218848 (α) 0.7178
220 201Hg 201 80 121 8.208956 (α) 0.3341
221 202Hg 202 80 122 8.206703 (α) 0.1363
222 203Tl 203 81 122 8.198230 (α) 0.9108
223 204Hg 204 80 124 8.192358 β) 0.4163
224 205Tl 205 81 124 8.187526 (α) 0.1567
225 206Pb 206 82 124 8.186791 (α) 1.1366
226 207Pb 207 82 125 8.179791 (α) 0.3915
227 208Pb 208 82 126 8.175888 (α) 0.5188

The following stable nuclides have been checked for radioactivity as instability candidates:

no nuclide A Z N energy half-life (sec) decay mode decay energy (MeV)
 228 134Xe 134 54 80 8.728973 > 1.830×1030 ββ 0.825
 229 40Ca 40 20 20 8.942485 > 9.467×1028 β+β+ 0.194
 230 132Ba 132 56 76 8.741288 > 9.467×1028 β+β+ 0.846
 231 78Kr 78 36 42 9.022349 > 7.258×1027 β+β+ 2.846
 232 160Gd 160 64 96 8.496009 > 9.783×1026 ββ 1.729
 233 184W 184 74 110 8.319737 > 9.152×1026 α 1.656
 234 186W 186 74 112 8.299873 > 8.521×1026 α 1.123
 235 183W 183 74 109 8.324699 > 4.102×1026 α 1.680
 236 182W 182 74 108 8.336424 > 2.619×1026 α 1.772
 237 114Cd 114 48 66 8.860985 > 2.020×1026 ββ 0.540
 238 50Cr 50 24 26 9.076517 > 4.102×1025 β+β+ 1.167
 239 108Cd 108 48 60 8.897735 > 3.156×1025 β+β+ 0.272
 240 142Ce 142 58 84 8.666666 > 8.205×1024 ββ, (α) 1.417, 1.298
 241 106Cd 106 48 58 8.893327 > 8.205×1024 β+β+ 2.770
 242 176Yb 176 70 106 8.375271 > 5.049×1024 ββ, (α) 1.083, 0.570
 243 204Pb 204 82 122 8.194414 > 4.418×1024 α 1.972
 244 124Xe 124 54 70 8.778264 > 3.471×1024 β+β+ 2.864
 245 123Te 123 52 71 8.796302 > 2.903×1024 β+ 0.052
 246 64Zn 64 30 34 9.102634 > 8.836×1023 +β+) 1.096
 247 120Te 120 52 68 8.816369 > 6.943×1023 β+β+ 1.700
 248 70Zn 70 30 40 9.065109 > 4.102×1023 ββ 0.998
 249 46Ca 46 20 26 9.009047 > 8.836×1022 ββ 0.988
 250 149Sm 149 62 87 8.589058 > 6.312×1022 α 1.870
 251 180mTa 180 73 107 8.342767 > 3.787×1022 , K, α) 0.783, 0.929, 2.103
 252 138Ce 138 58 80 8.705878 > 2.840×1021 β+β+ 0.694
 253 136Ce 136 58 78 8.707122 > 2.209×1021 β+β+ 2.419
 254 184Os 184 76 108 8.311850 > 1.767×1021 α, +β+) 2.963, 1.451

Primordial radioactive nuclides[edit]

The following 34 primordial nuclides have been measured to be radioactive, or decay products were identified (Te-130, Ba-130):

no nuclide energy half-life (sec) decay mode decay energy (MeV) half-life (years)
255 128Te 8.743261 6.94×1031 ββ 2.530 2.2×1024
256 136Xe 8.706805 7.5×1028 ββ 2.462 2.38×1021
257 76Ge 9.034656 5.6423×1028 ββ 2.039 1.8×1021
258 130Ba 8.742574 3.79×1028 KK 2.620 1.2×1021
259 82Se 9.017596 3.408×1027 ββ 2.995 1.1×1020
260 116Cd 8.836146 9.783×1026 ββ 2.809 3.102×1019
261 48Ca 8.992452 7.258×1026 ββ, β 4.274, 0.0058 2.301×1019
262 96Zr 8.961359 6.3×1026 ββ 3.348 2.0×1019
263 209Bi 8.158689 5.996×1026 α 3.137 1.9×1019
264 130Te 8.766578 2.777×1026 ββ 0.868 8.806×1018
265 150Nd 8.562594 2.493×1026 ββ 3.367 7.905×1018
266 100Mo 8.933167 2.461×1026 ββ 3.035 7.804×1018
267 151Eu 8.565759 1.578×1026 α 1.9644 5.004×1018
268 180W 8.347127 5.680×1025 α 2.509 1.801×1018
269 50V 9.055759 4.418×1024 β+, β 2.205, 1.038 1.4×1017
270 113Cd 8.859372 2.430×1023 β 0.321 7.7×1015
271 148Sm 8.607423 2.209×1023 α 1.986 7.005×1015
272 144Nd 8.652947 7.227×1022 α 1.905 2.292×1015
273 186Os 8.302508 6.312×1022 α 2.823 2.002×1015
274 174Hf 8.392287 6.312×1022 α 2.497 2.002×1015
275 115In 8.849910 1.392×1022 β 0.499 4.4×1014
276 152Gd 8.562868 3.408×1021 α 2.203 1.1×1014
277 190Pt 8.267764 2.051×1019 α 3.252 6.5×1011
278 147Sm 8.610593 3.345×1018 α 2.310 1.061×1011
279 138La 8.698320 3.219×1018 K, β 1.737, 1.044 1.021×1011
280 87Rb 9.043718 1.568×1018 β 0.283 4.972×1010
281 187Re 8.291732 1.300×1018 β, α 0.0026, 1.653 4.122×1010
282 176Lu 8.374665 1.187×1018 β 1.193 3.764×1010
283 232Th 7.918533 4.434×1017 α, SF 4.083 1.406×1010
284 238U 7.872551 1.410×1017 α, SF 4.270 4.471×109
285 40K 8.909707 3.938×1016 β, K, β+ 1.311, 1.505, 1.505 1.25×109
286 235U 7.897198 2.222×1016 α, SF 4.679 704×106
287 146Sm 8.626136 3.250×1015 α 2.529 103×106
288 244Pu 7.826221 2.525×1015 α, SF 4.666 80×106

Most of these isotopes have half-lives longer than the age of the universe (1.4×1010 years). The last entry, plutonium-244, has a half-life of 80 million years, or 1/57th of the age of the solar system. Some shorter-lived radionuclides (below) have been detected in uranium ore samples or in the spectra of stars (technetium, promethium, californium); these are not primordial, but are radioactive daughter products of primordial longer-lived nuclides. Others are known naturally on Earth from other spontaneous energetic production processes that have produced them since the birth of the solar system (i.e., from cosmic rays, such as carbon-14). About 50 of them have been observed to occur naturally.

Non-primordial radionuclides[edit]

These have half-lives of less than 80 million years.

no nuclide energy half-life (sec) decay mode half-life (years or days)
289 92Nb 9.010980 1.095×1015 K, β 3.470×107 y
290 236U 7.891470 7.391×1014 α, SF 2.342×107 y
291 205Pb 8.187279 5.459×1014 β+ 1.730×107 y
292 129I 8.757397 4.955×1014 β 1.570×107 y
293 247Cm 7.806008 4.923×1014 α 1.560×107 y
294 182Hf 8.324399 2.809×1014 β 8.901×106 y
295 107Pd 8.897197 2.051×1014 β 6.499×106 y
296 98Tc 8.953246 1.325×1014 β 4.199×106 y
297 53Mn 9.103175 1.180×1014 β+ 3.739×106 y
298 210mBi 8.140473 9.594×1013 α 2.579615×106 y
299 154Dy 8.528457 9.467×1013 α 3.000×106 y
300 60Fe 9.094861 8.268×1013 β 2.620×106 y
301 97Tc 8.970503 8.203×1013 β+ 2.600×106 y
302 135Cs 8.720082 7.258×1013 β 2.300×106 y
303 237Np 7.881989 6.766×1013 α, SF 2.144×106 y
304 150Gd 8.576454 5.649×1013 α 1.790×106 y
305 93Zr 9.008069 4.828×1013 β 1.530×106 y
306 10Be 6.810657 4.765×1013 β 1.510×106 y
307 26Al 8.540954 2.263×1013 β+ 7.171×105 y
308 242Pu 7.845218 1.183×1013 α, SF 3.749×105 y
309 208Bi 8.162049 1.161×1013 β+ 3.679×105 y
310 248Cm 7.799586 1.098×1013 α, SF 3.479×105 y
311 36Cl 8.891380 9.499×1012 β, β+ 3.010×105 y
312 79Se 9.032310 9.309×1012 β 2.950×105 y
313 234U 7.908308 7.747×1012 α, SF 2.455×105 y
314 126Sn 8.754026 7.258×1012 β 2.230×105 y
315 81Kr 9.030513 7.227×1012 β+ 2.290×105 y
316 99Tc 8.953379 6.662×1012 β 2.111×105 y
317 186mRe 8.295958 6.312×1012 I 2.000×105 y
318 233U 7.912873 5.024×1012 α, SF 1.592×105 y
319 236Np 7.887514 4.860×1012 β+, β, α 1.540×105 y
320 41Ca 8.928347 3.219×1012 β+ 1.020×105 y
321 59Ni 9.107863 2.398×1012 β+ 7.599×104 y
322 230Th 7.937136 2.379×1012 α, SF 7.539×104 y
323 137La 8.707101 1.893×1012 β+ 5.999×104 y
324 202Pb 8.199714 1.657×1012 β+, α 5.251×104 y
325 231Pa 7.926627 1.034×1012 α, SF 3.277×104 y
326 239Pu 7.868022 7.609×1011 α, SF 2.411×104 y
327 94Nb 8.990099 6.406×1011 β 2.030×104 y
328 245Cm 7.822329 2.682×1011 α, SF 8499 y
329 250Cm 7.779371 2.619×1011 SF, α, β 8299 y
330 243Am 7.836035 2.326×1011 α, SF 7371 y
331 229Th 7.942127 2.316×1011 α 7339 y
332 240Pu 7.862465 2.070×1011 α, SF 6560 y
333 14C 7.855620 1.799×1011[2] β 5701 y[2]
334 246Cm 7.816781 1.502×1011 α, SF 4760 y
335 163Ho 8.478591 1.442×1011 β+ 4570 y
336 93Mo 9.004693 1.262×1011 β+ 3999 y
337 226Ra 7.966597 5.049×1010 α 1600 y
338 247Bk 7.806182 4.355×1010 α 1380 y
339 166mHo 8.451273 3.787×1010 β 1200 y
340 251Cf 7.775969 2.834×1010 α, SF 898 y
341 91Nb 9.023327 2.146×1010 β+ 680 y
342 194Hg 8.237271 1.401×1010 β+ 444 y
343 108mAg 8.881439 1.382×1010 β+, I 438 y
344 241Am 7.851676 1.364×1010 α, SF 432 y
345 249Cf 7.791305 1.108×1010 α, SF 351 y
346 39Ar 8.923686 8.489×109 β 269 y
347 192mIr 8.251875 7.605×109 I 241 y
348 158Tb 8.511055 5.680×109 β+, β 180 y
349 242mAm 7.841913 4.450×109 I, α, SF 141 y
350 32Si 8.823856 4.166×109 β 132 y
351 209Po 8.149633 3.219×109 α, β+ 102 y
352 63Ni 9.111210 3.159×109 β 100 y
353 151Sm 8.565251 2.840×109 β
354 238Pu 7.877358 2.768×109 α, SF
355 157Tb 8.522096 2.241×109 β+
356 148Gd 8.586706 2.237×109 α
357 232U 7.922143 2.174×109 α, SF
358 44Ti 8.924702 1.893×109 β+
359 193Pt 8.249965 1.578×109 β+
360 121mSn 8.808499 1.385×109 I, β
361 150Eu 8.569974 1.164×109 β+
362 207Bi 8.168209 1.038×109 β+
363 42Ar 8.890923 1.038×109 β
364 137Cs 8.703047 9.477×108 β
365 243Cm 7.836004 9.183×108 α, β+, SF
366 90Sr 9.026239 9.120×108 β
367 210Pb 8.141462 7.006×108 β, α
368 227Ac 7.957447 6.871×108 β, α
369 244Cm 7.831763 5.712×108 α, SF
370 145Pm 8.631838 5.586×108 β+, α
371 241Pu 7.851590 4.510×108 β, α, SF
372 152Eu 8.550897 4.262×108 β+, β
373 250Cf 7.786640 4.128×108 α, SF
374 3H 3.087994 3.888×108 β
375 85Kr 9.029919 3.384×108 β
376 133Ba 8.729624 3.319×108 β+ 10.5 y
377 248Bk 7.796811 > 2.840×108 α 9.00 y
378 154Eu 8.537200 2.711×108 β, β+
379 194Os 8.238508 1.893×108 β
380 228Ra 7.944390 1.815×108 β
381 146Pm 8.615574 1.745×108 β+, β
382 60Co 9.098811 1.663×108 β
383 155Eu 8.534711 1.500×108 β
384 204Tl 8.190671 1.193×108 β, β+
385 174Lu 8.390726 1.045×108 β+
386 101Rh 8.936753 1.041×108 β+
387 102mRh 8.920680 9.152×107 β+, I
388 208Po 8.155315 9.145×107 α, β+
389 236Pu 7.889536 9.019×107 α, SF
390 125Sb 8.777367 8.705×107 β
391 55Fe 9.116407 8.637×107 β+
392 252Cf 7.769605 8.347×107 α, SF
393 147Pm 8.609068 8.279×107 β
394 22Na 8.306891 8.213×107 β+
395 134Cs 8.719768 6.517×107 β, β+
396 171Tm 8.417620 6.059×107 β
397 228Th 7.953906 6.033×107 α
398 172Hf 8.399252 5.901×107 β+
399 179Ta 8.352703 5.743×107 β+
400 173Lu 8.400147 4.323×107 β+
401 252Es 7.764621 4.075×107 α, β+, β
402 109Cd 8.883327 3.986×107 β+
403 235Np 7.896669 3.422×107 β+, α
404 106Ru 8.885686 3.228×107 β 1.02 y
405 144Pm 8.636751 3.136×107 β+ 363 d
406 145Sm 8.627590 2.938×107 β+
407 248Cf 7.800198 2.881×107 α, SF
408 249Bk 7.790805 2.851×107 β, α, SF
409 49V 9.050040 2.843×107 β+
410 54Mn 9.100131 2.697×107 β+, β
411 144Ce 8.629918 2.462×107 β
412 254Es 7.748524 2.382×107 α, β, SF, β+
413 57Co 9.112454 2.348×107 β+
414 68Ge 9.056327 2.341×107 β+
415 143Pm 8.651509 2.290×107 β+
416 110mAg 8.865355 2.158×107 β, I
417 65Zn 9.085352 2.105×107 β+
418 153Gd 8.547731 2.077×107 β+
419 195Au 8.238353 1.608×107 β+
420 194mIr 8.238025 1.477×107 β
421 184mRe 8.310670 1.460×107 I, β+
422 242Cm 7.844860 1.407×107 α, SF
423 45Ca 8.978261 1.405×107 β
424 177mLu 8.361829 1.386×107 β, I
425 121mTe 8.800749 1.331×107 I, β+
426 159Dy 8.506378 1.248×107 β+
427 210Po 8.147295 1.196×107 α
428 139Ce 8.696881 1.189×107 β+
429 123Sn 8.785311 1.116×107 β
430 170Tm 8.423096 1.111×107 β, β+
431 151Gd 8.562685 1.071×107 β+, α
432 181W 8.337924 1.047×107 β+
433 75Se 9.033581 1.035×107 β+
434 113Sn 8.853035 9.944×106 β+
435 182Ta 8.326456 9.887×106 β
436 127mTe 8.765759 9.418×106 I
437 88Y 9.029272 9.212×106 β+
438 257Fm 7.726619 8.683×106 α, SF 114 d
439 185Os 8.302730 8.087×106 β+
440 168Tm 8.436316 8.044×106 β+, β
441 149Eu 8.584395 8.044×106 β+
442 35S 8.895510 7.561×106 β
443 83Rb 9.024038 7.448×106 β+
444 46Sc 8.979091 7.239×106 β
445 88Zr 9.021589 7.206×106 β+
446 73As 9.043341 6.938×106 β+
447 56Co 9.072031 6.673×106 β+
448 185W 8.305866 6.489×106 β
449 160Tb 8.495346 6.247×106 β
450 58Co 9.103153 6.122×106 β+
451 183Re 8.321661 6.048×106 β+
452 175Hf 8.382665 6.048×106 β+
453 188W 8.277003 6.029×106 β
454 85Sr 9.025480 5.602×106 β+
455 95Zr 8.972989 5.532×106 β
456 95mTc 8.976359 5.270×106 β+, I
457 254Cf 7.751087 5.227×106 SF, α
458 124Sb 8.777943 5.194×106 β
459 125I 8.782019 5.132×106 β+
460 91Y 9.020174 5.055×106 β
461 148Eu 8.586882 4.709×106 β+, α
462 7Be 5.818470 4.598×106 β+
463 258Md 7.715948 4.450×106 α, SF
464 89Sr 9.039969 4.369×106 β
465 114mIn 8.846608 4.278×106 I, β+
466 146Gd 8.592512 4.171×106 β+
467 203Hg 8.195806 4.026×106 β
468 237Pu 7.881060 3.905×106 β+, α
469 115mCd 8.835754 3.850×106 β
470 59Fe 9.099516 3.844×106 β
471 181Hf 8.333272 3.662×106 β
472 148mPm 8.589800 3.567×106 β, I
473 105Ag 8.900547 3.567×106 β+
474 255Es 7.741567 3.439×106 β, α, SF
475 103Ru 8.918500 3.392×106 β
476 127Xe 8.766768 3.145×106 β+
477 95Nb 8.984821 3.023×106 β
478 37Ar 8.907752 3.020×106 β+
479 129mTe 8.744953 2.903×106 I, β
480 84Rb 9.020732 2.860×106 β+, β
481 241Cm 7.848492 2.834×106 β+, α
482 141Ce 8.677286 2.809×106 β
483 169Yb 8.428546 2.767×106 β+
484 260Md 7.699789 2.748×106 SF, α, β+, β
485 51Cr 9.080127 2.393×106 β+
486 240Cm 7.855805 2.333×106 α, β+, SF
487 233Pa 7.910426 2.331×106 β
488 82Sr 8.998254 2.208×106 β+
489 33P 8.869434 2.189×106 β
490 234Th 7.897763 2.082×106 β
491 147Eu 8.598879 2.082×106 β+, α
492 178W 8.354563 1.866×106 β+
493 230U 7.933871 1.797×106 α, SF
494 253Es 7.759019 1.769×106 α, SF
495 227Th 7.957644 1.614×106 α
496 86Rb 9.033502 1.611×106 β, β+
497 253Cf 7.757885 1.539×106 β, α
498 74As 9.028895 1.535×106 β+, β
499 230Pa 7.931436 1.503×106 β+, β, α
500 103Pd 8.920638 1.468×106 β+
501 99Rh 8.935711 1.391×106 β+
502 48V 8.997890 1.380×106 β+
503 191Os 8.261870 1.331×106 β
504 205Bi 8.174069 1.323×106 β+
505 156Eu 8.520642 1.312×106 β
506 225Ra 7.973576 1.287×106 β
507 32P 8.830865 1.232×106 β
508 143Pr 8.652258 1.172×106 β
509 189Ir 8.274783 1.140×106 β+
510 136Cs 8.706171 1.127×106 β
511 126I 8.769026 1.117×106 β+, β
512 140Ba 8.666120 1.102×106 β
513 126Sb 8.757042 1.067×106 β
514 202Tl 8.199956 1.057×106 β+
515 190Ir 8.264755 1.018×106 β+
516 131Ba 8.733037 9.936×105 β+
517 223Ra 7.994042 9.876×105 α
518 71Ge 9.055943 9.876×105 β+
519 147Nd 8.602973 9.487×105 β
520 246Pu 7.805494 9.366×105 β
521 188Pt 8.272514 8.813×105 β+, α
522 225Ac 7.975159 8.640×105 α 10 d
523 131Cs 8.743541 8.371×105 β+
524 125Sn 8.758515 8.329×105 β
525 169Er 8.431852 8.115×105 β
526 149Gd 8.575576 8.018×105 β+, α
527 167Tm 8.445866 7.992×105 β+
528 206Po 8.159590 7.603×105 β+, α
529 72Se 9.014300 7.258×105 β+
530 106mAg 8.890639 7.154×105 β+
531 171Lu 8.409532 7.119×105 β+
532 131I 8.738842 6.930×105 β
533 257Es 7.723468 6.653×105 β, SF
534 111Ag 8.866111 6.437×105 β
535 161Tb 8.490383 5.967×105 β
536 237U 7.879800 5.832×105 β
537 172Lu 8.401217 5.789×105 β+
538 132Cs 8.731599 5.599×105 β+, β
539 206Bi 8.168551 5.394×105 β+
540 196Au 8.230205 5.328×105 β+, β
541 56Ni 9.033899 5.249×105 β+
542 118Te 8.814726 5.184×105 β+
543 145Eu 8.609245 5.124×105 β+
544 120mSb 8.808194 4.977×105 β+
545 52Mn 9.046431 4.831×105 β+
546 156Tb 8.520667 4.622×105 β+
547 155Tb 8.531031 4.596×105 β+
548 133Xe 8.730302 4.530×105 β
549 183Ta 8.318847 4.406×105 β
550 245Bk 7.819020 4.268×105 β+, α
551 119mTe 8.801773 4.061×105 β+, I
552 146Eu 8.599560 3.983×105 β+
553 47Ca 8.972181 3.919×105 β
554 234Np 7.900571 3.802×105 β+
555 96Tc 8.965255 3.698×105 β+
556 231U 7.924977 3.629×105 β+, α
557 175Yb 8.383902 3.616×105 β
558 124I 8.775884 3.608×105 β+
559 127Sb 8.754005 3.326×105 β
560 222Rn 7.997573 3.304×105 α
561 224Ra 7.987277 3.138×105 α
562 100Pd 8.923587 3.136×105 β+
563 166Dy 8.448376 2.938×105 β
564 140Nd 8.673113 2.912×105 β+
565 47Sc 9.014564 2.894×105 β
566 87Y 9.025565 2.873×105 β+
567 89Zr 9.024912 2.823×105 β+
568 67Ga 9.069532 2.819×105 β+
569 132Te 8.716646 2.768×105 β
570 134Ce 8.704432 2.730×105 β+
571 199Au 8.217534 2.712×105 β
572 201Tl 8.206561 2.625×105 β+
573 253Fm 7.757691 2.592×105 β+, α
574 191Pt 8.258228 2.473×105 β+
575 111In 8.867688 2.423×105 β+
576 97Ru 8.959080 2.411×105 β+
577 99Mo 8.939669 2.375×105 β
578 122Sb 8.795346 2.353×105 β, β+
579 71As 9.027581 2.350×105 β+
580 198Au 8.220732 2.329×105 β
581 197Hg 8.226358 2.309×105 β+
582 90Y 9.032294 2.306×105 β
583 182Re 8.321053 2.304×105 β+
584 172Tm 8.404932 2.290×105 β
585 67Cu 9.076086 2.226×105 β
586 44mSc 8.924627 2.110×105 I, β+
587 128Ba 8.738523 2.100×105 β+
588 77Br 9.022431 2.053×105 β+
589 166Yb 8.442340 2.041×105 β+
590 177Ta 8.363553 2.036×105 β+
591 239Np 7.864999 2.036×105 β
592 153Tb 8.537471 2.022×105 β+
593 66Ni 9.071423 1.966×105 β
594 247Pu 7.791975 1.961×105 β
595 149Pm 8.581871 1.911×105 β
596 203Pb 8.193431 1.869×105 β+
597 238Np 7.871931 1.829×105 β
598 240Am 7.856694 1.829×105 β+, α
599 172Er 8.399752 1.775×105 β
600 170Lu 8.408445 1.738×105 β+
601 252Cm 7.757439 < 1.728×105 β
602 72Zn 9.017591 1.674×105 β
603 153Sm 8.545614 1.666×105 β
604 202Pt 8.183209 1.584×105 β
605 48Sc 8.998327 1.572×105 β
606 246Bk 7.811287 1.555×105 β+, α
607 195mHg 8.229399 1.498×105 I, β+
608 188Ir 8.275200 1.494×105 β+
609 140La 8.673620 1.450×105 β
610 69Ge 9.043800 1.406×105 β+
611 77As 9.031283 1.398×105 β
612 119Sb 8.823235 1.375×105 β+
613 147Gd 8.584001 1.370×105 β+
614 194Au 8.237626 1.369×105 β+
615 229Pa 7.940769 1.296×105 β+, α
616 246Cf 7.810792 1.285×105 α, β+, SF
617 57Ni 9.055222 1.282×105 β+
618 105Rh 8.907956 1.273×105 β
619 82Br 9.016407 1.270×105 β
620 79Kr 9.013644 1.261×105 β+
621 137mCe 8.696327 1.238×105 I, β+
622 169Lu 8.414978 1.226×105 β+
623 143Ce 8.642041 1.189×105 β
624 251Es 7.774467 1.188×105 β+, α
625 83Sr 8.996568 1.167×105 β+
626 129Cs 8.749622 1.154×105 β+
627 268Db 7.635133 1.152×105 SF
628 232Pa 7.916379 1.132×105 β, β+
629 193Os 8.244348 1.084×105 β
630 165Tm 8.452758 1.082×105 β+
631 131mTe 8.720392 1.080×105 β, I
632 226Ac 7.963761 1.057×105 β, β+, α
633 160Er 8.484190 1.029×105 β+
634 151Pm 8.557387 1.022×105 β
635 76As 9.022505 9.454×104 β
636 200Tl 8.206567 9.396×104 β+
637 72As 9.018966 9.360×104 β+
638 231Th 7.924932 9.187×104 β, α
639 252Fm 7.766498 9.140×104 α, SF
640 189Re 8.272269 8.748×104 β 1.01 d

Nuclides with half-lives less than 24 hours but more than 1.0 hour[edit]

no nuclide energy half-life decay mode
641 187W 8.284722 8.539×104 β
642 173Hf 8.391617 8.496×104 β+
643 96Nb 8.963036 8.406×104 β
644 154mTb 8.526912 8.172×104 β+, I
645 43K 8.922327 8.028×104 β
646 182Os 8.316432 7.956×104 β+
647 228Pa 7.944468 7.920×104 β+, α
648 48Cr 8.963390 7.762×104 β+
649 200Pb 8.202542 7.740×104 β+
650 112Pd 8.842185 7.571×104 β
651 28Mg 8.607706 7.529×104 β
652 100Rh 8.927167 7.488×104 β+
653 133I 8.717094 7.488×104 β
654 122Xe 8.770959 7.236×104 β+
655 255Fm 7.742704 7.225×104 α, SF
656 181Re 8.328294 7.164×104 β+
657 197Pt 8.225756 7.161×104 β
658 135La 8.713179 7.020×104 β+
659 142Pr 8.661417 6.883×104 β, β+
660 200mAu 8.202877 6.732×104 β, I
661 159Gd 8.502576 6.652×104 β
662 135Ce 8.698179 6.372×104 β+
663 193Au 8.244353 6.354×104 β+
664 151Tb 8.545692 6.339×104 β+, α
665 55Co 9.053647 6.311×104 β+
666 152Tb 8.536591 6.300×104 β+, α
667 188Re 8.278860 6.121×104 β
668 125Xe 8.768864 6.084×104 β+
669 97Zr 8.926451 6.028×104 β
670 186Ir 8.281935 5.990×104 β+
671 86Zr 8.975979 5.940×104 β+
672 76Br 8.996183 5.832×104 β+
673 170Hf 8.402210 5.764×104 β+
674 157Eu 8.513792 5.465×104 β
675 24Na 8.422082 5.382×104 β
676 76Kr 8.979406 5.328×104 β+
677 86Y 8.993234 5.306×104 β+
678 211Rn 8.112825 5.256×104 β+, α
679 90Nb 8.989727 5.256×104 β+
680 185Ir 8.289382 5.184×104 β+
681 240U 7.851682 5.076×104 β
682 72Ga 9.023958 5.074×104 β
683 69mZn 9.056536 4.954×104 I, β
684 109Pd 8.875061 4.932×104 β
685 123I 8.786311 4.760×104 β+
686 265Rf 7.661139 4.680×104 α
687 183Os 8.309907 4.680×104 β+
688 64Cu 9.093581 4.572×104 β+, β
689 200Pt 8.204342 4.500×104 β
690 130I 8.740035 4.450×104 β
691 42K 8.905175 4.436×104 β
692 171Hf 8.395480 4.356×104 β+
693 239Am 7.864666 4.284×104 β+, α
694 193mHg 8.231483 4.248×104 β+, I
695 203Bi 8.177436 4.234×104 β+
696 77Ge 8.996185 4.068×104 β
697 204Bi 8.172651 4.039×104 β+
698 189Pt 8.264359 3.913×104 β+
699 212Pb 8.106928 3.830×104 β
700 175Ta 8.370813 3.780×104 β+
701 245Pu 7.813752 3.780×104 β
702 187Ir 8.283713 3.780×104 β+
703 165Er 8.462406 3.730×104 β+
704 93Y 8.976951 3.665×104 β
705 244Am 7.825914 3.636×104 β
706 266Rf 7.658170 3.600×104 α, SF
709 155Dy 8.517521 3.564×104 β+
710 91Sr 8.990503 3.467×104 β
711 66Ga 9.036843 3.416×104 β+
712 156Sm 8.516007 3.384×104 β
713 201Pb 8.196989 3.359×104 β+
714 62Zn 9.057957 3.307×104 β+
715 135Xe 8.711453 3.290×104 β
716 128Sb 8.732343 3.244×104 β
717 234Pu 7.898892 3.168×104 β+, α
718 184Ta 8.304154 3.132×104 β
719 250Es 7.778407 3.096×104 β+, α
720 101Pd 8.917149 3.049×104 β+
721 52Fe 9.000789 2.979×104 β+
722 173Tm 8.396524 2.966×104 β
723 157Dy 8.513544 2.930×104 β+
724 210At 8.128337 2.916×104 β+, α
725 176Ta 8.363202 2.912×104 β+
726 166Tm 8.444183 2.772×104 β+
727 256mEs 7.730742 2.736×104 β
728 171Er 8.408901 2.706×104 β
729 199Tl 8.212333 2.671×104 β+
730 211At 8.126527 2.597×104 β+, α
731 73Se 9.005821 2.574×104 β+
732 234Pa 7.898930 2.412×104 β
733 135I 8.691994 2.365×104 β
734 107Cd 8.884271 2.340×104 β+
735 82mRb 8.999608 2.330×104 β+, I
736 153Dy 8.523288 2.304×104 β+, α
737 127Cs 8.750383 2.250×104 β+
738 228Ac 7.944591 2.214×104 β
740 145Pr 8.620514 2.154×104 β
741 207Po 8.154158 2.088×104 β+, α
742 90Mo 8.962072 2.002×104 β+
743 257Md 7.725040 1.987×104 β+, α, SF
744 111mPd 8.844589 1.980×104 I, β
745 139mNd 8.659529 1.980×104 β+, I
746 209At 8.132954 1.948×104 β+, α
747 113Ag 8.841531 1.933×104 β
748 198Tl 8.210166 1.908×104 β+
749 251Fm 7.768590 1.908×104 β+, α
750 138Nd 8.665661 1.814×104 β+
751 160mHo 8.485877 1.807×104 I, β+
752 118mSb 8.814963 1.800×104 β+
754 243Pu 7.833648 1.784×104 β
755 192Au 8.242036 1.778×104 β+
756 110In 8.857464 1.764×104 β+
757 133mCe 8.690771 1.764×104 β+
758 94Tc 8.966583 1.758×104 β+
759 85mY 8.986880 1.750×104 β+, I
760 73Ga 9.026112 1.750×104 β
761 192Hg 8.238051 1.746×104 β+
762 132La 8.705721 1.728×104 β+
763 179Lu 8.345428 1.652×104 β
764 81Rb 9.002871 1.645×104 β+
765 243Bk 7.829801 1.620×104 β+, α
766 105Ru 8.889689 1.598×104 β
767 80mBr 9.018872 1.591×104 I
768 139Pr 8.681565 1.588×104 β+
769 129Sb 8.727358 1.584×104 β
770 244Bk 7.822491 1.566×104 β+, α
771 109In 8.864805 1.512×104 β+
772 184Hf 8.296871 1.483×104 β
773 149Tb 8.551166 1.482×104 β+, α
774 110Sn 8.851727 1.480×104 β+
775 262Lr 7.681556 1.440×104 SF, β+, α
776 71mZn 9.017370 1.426×104 β, I
777 141La 8.659540 1.411×104 β
778 133La 8.714109 1.408×104 β+
779 43Sc 8.912907 1.401×104 β+
780 195mIr 8.233326 1.368×104 β, I
781 92Y 8.993208 1.274×104 β
782 204Po 8.161200 1.271×104 β+, α
783 132Ce 8.696131 1.264×104 β+
784 150Tb 8.545394 1.253×104 β+, α
785 117mCd 8.808840 1.210×104 β
786 61Cu 9.087452 1.200×104 β+
787 209Pb 8.155607 1.171×104 β
788 254Fm 7.752808 1.166×104 α, SF
789 250Bk 7.779523 1.156×104 β
790 161Er 8.476352 1.156×104 β+
791 190mRe 8.257433 1.152×104 β, I
792 191Au 8.248343 1.145×104 β+
793 173Ta 8.374218 1.130×104 β+
794 112Ag 8.844756 1.127×104 β
795 247Cf 7.803566 1.120×104 β+, α
796 184Ir 8.286599 1.112×104 β+
797 45Ti 8.938121 1.109×104 β+
798 167Ho 8.444304 1.081×104 β
799 269Db 7.630064 1.080×104 α, SF
800 239Cm 7.857143 1.044×104 β+, α
801 197Tl 8.215190 1.022×104 β+
802 88Kr 8.976918 1.022×104 β
803 38S 8.778196 1.022×104 β
804 117Sb 8.828977 1.008×104 β+
805 224Ac 7.980993 1.001×104 β+, α, β
806 93Tc 8.970274 9.900×103 β+
807 150Pm 8.562014 9.648×103 β
808 92Sr 8.972067 9.576×103 β
809 256Fm 7.737398 9.456×103 SF, α
810 31Si 8.811618 9.438×103 β
811 56Mn 9.087572 9.284×103 β
812 65Ni 9.073267 9.062×103 β
813 176W 8.359055 9.000×103 β+
814 116Te 8.806414 8.964×103 β+
815 141Nd 8.668476 8.964×103 β+
816 161Ho 8.488737 8.928×103 β+
817 210Rn 8.117032 8.640×103 α, β+
818 198Pb 8.202893 8.640×103 β+
819 238Cm 7.863764 8.640×103 β+, α
820 83Br 9.023243 8.640×103 β
821 152Dy 8.532670 8.568×103 β+, α
822 178mTa 8.355075 8.496×103 β+
823 187Pt 8.267638 8.460×103 β+
824 165Dy 8.456891 8.402×103 β
825 267Rf 7.647357 8.280×103 SF
826 132I 8.720570 8.262×103 β
827 158Er 8.484619 8.244×103 β+
828 66Ge 9.004964 8.136×103 β+
829 129Ba 8.730746 8.028×103 β+
830 177W 8.352118 7.920×103 β+
831 106mRh 8.884761 7.860×103 β
832 138mPr 8.671088 7.632×103 β+
833 121I 8.784443 7.632×103 β+
834 127Sn 8.728800 7.560×103 β
835 123Xe 8.764409 7.488×103 β+
836 186Pt 8.274897 7.488×103 β+, α
837 245Am 7.818674 7.380×103 β
838 89Nb 8.977507 7.308×103 β+
839 117mIn 8.828849 6.972×103 β, I
840 177Yb 8.359401 6.880×103 β
841 196Tl 8.211618 6.624×103 β+
842 18F 8.022789 6.585×103 β+
843 41Ar 8.877852 6.577×103 β
844 163Tm 8.456205 6.516×103 β+
845 239Pa 7.848148 6.480×103 β
846 201Bi 8.177875 6.480×103 β+, α
847 207At 8.135303 6.480×103 β+, α
848 224Rn 7.971327 6.420×103 β
849 80Sr 8.950177 6.378×103 β+
850 181Os 8.311935 6.300×103 β+
851 205Po 8.156737 6.264×103 β+, α
852 149Nd 8.570529 6.221×103 β
853 202Bi 8.173966 6.192×103 β+, α
854 249Es 7.785464 6.132×103 β+, α
855 147Tb 8.552634 6.120×103 β+
856 87Zr 8.983373 6.048×103 β+
857 126Ba 8.727439 6.000×103 β+
858 61Co 9.102449 5.940×103 β
859 95Ru 8.949749 5.915×103 β+
860 238Am 7.867882 5.880×103 β+, α
861 208At 8.131376 5.868×103 β+, α
862 75Br 8.993181 5.802×103 β+
863 259Md 7.709860 5.760×103 SF, α
864 230Ra 7.921249 5.580×103 β
865 142La 8.634954 5.466×103 β
866 78As 9.004879 5.442×103 β
867 199Pb 8.198111 5.400×103 β+
870 78Ge 8.992635 5.280×103 β
871 255Cf 7.738739 5.100×103 β
872 196mIr 8.219440 5.040×103 β, I
873 139Ba 8.682217 4.984×103 β
874 75Ge 9.029413 4.967×103 β
875 120I 8.769577 4.896×103 β+
876 256Md 7.729062 4.620×103 β+, α, SF
877 137Pr 8.678459 4.608×103 β+
878 87Kr 8.999022 4.578×103 β
879 164Yb 8.443419 4.548×103 β+
880 163Er 8.471168 4.500×103 β+
881 77Kr 8.982618 4.464×103 β+
882 178Yb 8.350530 4.440×103 β
883 267Db 7.644361 4.380×103 SF
884 237Am 7.874830 4.380×103 β+, α
885 142Sm 8.627616 4.349×103 β+
886 97Nb 8.953864 4.326×103 β
887 185Pt 8.269598 4.254×103 β+
888 195Tl 8.215712 4.176×103 β+
889 104Ag 8.889702 4.152×103 β+
890 174Ta 8.368684 4.104×103 β+
891 68Ga 9.057888 4.063×103 β+
892 162mHo 8.478371 4.020×103 I, β+
893 103Ag 8.894541 3.942×103 β+
894 249Cm 7.787191 3.849×103 β
895 183Hf 8.307885 3.841×103 β
896 229Ac 7.937048 3.762×103 β
897 117Te 8.798652 3.720×103 β+
898 240Np 7.853348 3.714×103 β
899 212Bi 8.109617 3.633×103 β, α
900 116mSb 8.816483 3.618×103 β+
901 148Tb 8.547949 3.600×103 β+

Naturally occurring isotopes with half-lives below one hour[edit]

nuclide half-life decay mode
223Fr 22 min α, β
221Fr 4.8 min α
219At 56 s α

See also[edit]

Sources[edit]

Almost all data are taken from reference.[3] For more recent updates, see reference.[4] These sources do not indicate whether certain heavy isotopes starting from Lr, Rf, Db... (etc.) were produced, observed, or only predicted from estimated data.

References[edit]

  1. ^ Table data is derived by counting members of the list; see WP:CALC. References for the list data itself are given below in this reference section
  2. ^ a b Other sources give the half-life of 14C as 5730 years (=1.808×1011 seconds)
  3. ^ Jagdish K. Tuli, Nuclear Wallet Cards, 7th edition, April 2005, Brookhaven National Laboratory, US National Nuclear Data Center
  4. ^ Interactive Chart of Nuclides (Brookhaven National Laboratory)

External links[edit]