Isotope von Actinium
Für Actinium sind hier 32 Isotope mit gemessener Halbwertszeit aufgeführt. Actinium hat kein stabiles Isotop. Am langlebigsten ist Actinium-227 mit einer Halbwertszeit von 21,772 Jahren.
Alle Isotope
| Isotop | Neutronen | Halbwertszeit | Hauptzerfallsart | Entdeckt |
|---|---|---|---|---|
| Actinium-205 | 116 | 80 Millisekunden | Alpha-Zerfall | 2014 |
| Actinium-206 | 117 | 25 Millisekunden | Alpha-Zerfall | 1998 |
| Actinium-207 | 118 | 31 Millisekunden | Alpha-Zerfall | 1994 |
| Actinium-208 | 119 | 97 Millisekunden | Alpha-Zerfall | 1994 |
| Actinium-209 | 120 | 94 Millisekunden | Alpha-Zerfall | 1968 |
| Actinium-210 | 121 | 350 Millisekunden | Alpha-Zerfall | 1968 |
| Actinium-211 | 122 | 213 Millisekunden | Alpha-Zerfall | 1968 |
| Actinium-212 | 123 | 895 Millisekunden | Alpha-Zerfall | 1968 |
| Actinium-213 | 124 | 738 Millisekunden | Alpha-Zerfall | 1968 |
| Actinium-214 | 125 | 8,2 Sekunden | Alpha-Zerfall | 1968 |
| Actinium-215 | 126 | 171 Millisekunden | Alpha-Zerfall | 1968 |
| Actinium-216 | 127 | 440 Mikrosekunden | Alpha-Zerfall | 1967 |
| Actinium-217 | 128 | 69 Nanosekunden | Alpha-Zerfall | 1972 |
| Actinium-218 | 129 | 1 Mikrosekunde | Alpha-Zerfall | 1970 |
| Actinium-219 | 130 | 9,4 Mikrosekunden | Alpha-Zerfall | 1970 |
| Actinium-220 | 131 | 26,36 Millisekunden | Alpha-Zerfall | 1970 |
| Actinium-221 | 132 | 52 Millisekunden | Alpha-Zerfall | 1968 |
| Actinium-222 | 133 | 5 Sekunden | Alpha-Zerfall | 1949 |
| Actinium-223 | 134 | 2,1 Minuten | Alpha-Zerfall | 1948 |
| Actinium-224 | 135 | 2,78 Stunden | Beta-plus-Zerfall | 1948 |
| Actinium-225 | 136 | 9,919 Tage | Alpha-Zerfall | 1947 |
| Actinium-226 | 137 | 29,37 Stunden | Beta-minus-Zerfall | 1950 |
| Actinium-227 | 138 | 21,772 Jahre | Beta-minus-Zerfall | 1851 |
| Actinium-228 | 139 | 6,15 Stunden | Beta-minus-Zerfall | 1908 |
| Actinium-229 | 140 | 62,7 Minuten | Beta-minus-Zerfall | 1952 |
| Actinium-230 | 141 | 122 Sekunden | Beta-minus-Zerfall | 1973 |
| Actinium-231 | 142 | 7,5 Minuten | Beta-minus-Zerfall | 1973 |
| Actinium-232 | 143 | 1,98 Minuten | Beta-minus-Zerfall | 1986 |
| Actinium-233 | 144 | 143 Sekunden | Beta-minus-Zerfall | 1983 |
| Actinium-234 | 145 | 45 Sekunden | Beta-minus-Zerfall | 1986 |
| Actinium-235 | 146 | 62 Sekunden | Beta-minus-Zerfall | 2006 |
| Actinium-236 | 147 | 4,5 Minuten | Beta-minus-Zerfall | 2010 |