# Liste der Isotope/Ordnungszahl 81 bis Ordnungszahl 90

Liste der Isotope ist die Übersichtsseite, um komfortabel auf alle Elemente zugreifen zu können. Dort wird auch der Aufbau erklärt und die Legende zur Tabelle ist auch dort zu finden. Zerfallsenergien wurden mit den angegebenen Massen und dem Masse-Energie-Äquivalent von $\textstyle \Delta m=931{,}4940954{\frac {\mathrm {MeV} }{\mathrm {u} }}$ neu berechnet.

## $_{81}$ Thallium

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) | NH (%) | Masse (u) |
| $^{179}$Tl | 0,16 s | 6,86 | | α ≈ 100 | | 180,438556 |
| $^{179m1}$Tl | 1,4 ms | 6,86 | (9/2−) | α ≈ 100 | | 180,438556 |
| $^{180}$Tl | 0,70 s | 6,82 (α), 11,1 (εβ$^+$) | | α = ?, εβ$^+$ = ?, εSF ≈ 1,0·10$^{−4}$ | | 181,447221 |
| $^{181}$Tl | 3,2 s | 8,5 | (1/2+) | εβ$^+$ > 0 | | 182,455885 |
| $^{181m1}$Tl | 1,40 ms | | (9/2−) | IT = 99,60, α = 0,40 | | 182,455885 |
| $^{182}$Tl | 3,1 s | 10,1 (εβ$^+$), 6,55 (α) | (7+) | εβ$^+$ > 96, α < 4 | | 183,464550 |
| $^{183}$Tl | 6,9 s | 7,6 | (1/2+) | εβ$^+$ > 0 | | 184,473215 |
| $^{183m1}$Tl | 53,3 ms | 0,550 (IT), 6,85 (α) | (9/2−) | IT > 99,990, α < 0,010 | | 184,473215 |
| $^{183m2}$Tl | 1,48 µs | | (13/2+) | IT | | 184,473215 |
| $^{184}$Tl | 11 s | 9,2 (εβ$^+$), 6,30 (α) | 2+ | εβ$^+$ = 97,9, α = 2,1 | | 185,481880 |
| $^{185}$Tl | 19,5 s | 6,6 | (1/2+) | εβ$^+$ = ? | | 186,490545 |
| $^{185m1}$Tl | 1,83 s | 0,454 (IT), 6,554 (α) | (9/2−) | IT = ?, α = ? | | 186,490545 |
| $^{186}$Tl | 27,5 s | 8,5 (εβ$^+$), 5,89 (α) | (7+) | εβ$^+$ ≈ 100, α ≈ 0,006 | | 187,49921 |
| $^{186m1}$Tl | 2,9 s | 0,374 | (10−) | IT | | 187,49921 |
| $^{187}$Tl | 51 s | 5,9 (εβ$^+$), 5,539 (α) | (1/2+) | εβ$^+$ = ?, α = ? | | 188,507875 |
| $^{187m1}$Tl | 15,60 s | 0,335 (IT), 6,235 (εβ$^+$), 5,874 (α) | (9/2−) | IT = ?, εβ$^+$ = ?, α = ? | | 188,507875 |
| $^{188}$Tl | 71 s | 7,8 | (2−) | εβ$^+$ | | 189,51654 |
| $^{188m1}$Tl | 71 s | 7,8 | (7+) | εβ$^+$ | | 189,51654 |
| $^{188m2}$Tl | 41 ms | | (9−) | IT | | 189,51654 |
| $^{189}$Tl | 2,3 min | 5,18 | (1/2+) | εβ$^+$ | | 190,525205 |
| $^{189m1}$Tl | 1,4 min | 5,461 (εβ$^+$), 0,281 (IT) | (9/2−) | εβ$^+$ ≈ 100, IT < 4 | | 190,525205 |
| $^{190}$Tl | 2,6 min | 7,0 | (2)− | εβ$^+$ | | 191,53370 |
| $^{190m1}$Tl | 3,7 min | 7,0 | (7+) | εβ$^+$ | | 191,53370 |
| $^{191}$Tl | | 4,49 | (1/2+) | εβ$^+$ = ? | | 192,542535 |
| $^{191m1}$Tl | 5,22 min | 4,789 | 9/2(−) | εβ$^+$ | | 192,542535 |
| $^{192}$Tl | 9,6 min | 6,12 | (2−) | εβ$^+$ | | 193,5512 |
| $^{192m1}$Tl | 10,8 min | 6,12 | (7+) | εβ$^+$ | | 193,5512 |
| $^{193}$Tl | 21,6 min | 3,64 | 1/2+ | εβ$^+$ | | 194,559864 |
| $^{193m1}$Tl | 2,11 min | 0,365 (IT), 4,005 (εβ$^+$) | 9/2− | IT = 75, εβ$^+$ = 25 | | 194,559864 |
| $^{194}$Tl | 33,0 min | 5,28 (εβ$^+$), 3,49 (α) | 2− | εβ$^+$ ≈ 100, α < 1·10$^{−7}$ | | 195,568529 |
| $^{194m1}$Tl | 32,8 min | 5,28 | (7+) | εβ$^+$ | | 195,568529 |
| $^{195}$Tl | 1,16 h | 2,81 | 1/2+ | εβ$^+$ | | 196,577194 |
| $^{195m1}$Tl | 3,6 s | 0,483 | 9/2− | IT | | 196,577194 |
| $^{196}$Tl | 1,84 h | 4,38 | 2− | εβ$^+$ | | 197,585859 |
| $^{196m1}$Tl | 1,41 h | 4,774 (εβ$^+$) 0,394 (IT) | (7+) | εβ$^+$ = 95,5, IT = 4,5 | | 197,585859 |
| $^{197}$Tl | 2,84 h | 2,18 | 1/2+ | εβ$^+$ | | 198,594524 |
| $^{197m1}$Tl | 0,54 s | 0,608 | 9/2− | IT | | 198,594524 |
| $^{198}$Tl | 5,3 h | 3,46 | 2− | εβ$^+$ | | 199,603189 |
| $^{198m1}$Tl | 1,87 h | 4,004 (εβ$^+$), 0,544 (IT) | 7+ | εβ$^+$ = 54, IT = 46 | | 199,603189 |
| $^{198m2}$Tl | 32,1 ms | 0,742 | (10−) | IT | | 199,603189 |
| $^{199}$Tl | 7,42 h | 1,44 | 1/2+ | εβ$^+$ | | 200,611854 |
| $^{199m1}$Tl | 28,4 ms | 0,75 | 9/2− | IT | | 200,611854 |
| $^{200}$Tl | 26,1 h | 2,456 | 2− | εβ$^+$ | | 201,620519 |
| $^{200m1}$Tl | 34,3 ms | 0,754 | 7+ | IT | | 201,620519 |
| $^{201}$Tl | 72,912 h | 0,483 | 1/2+ | ε | | 202,629184 |
| $^{201m1}$Tl | 2,035 ms | 0,92 | (9/2−) | IT | | 202,629184 |
| $^{202}$Tl | 12,23 d | 1,365 | 2− | εβ$^+$ | | 203,637849 |
| $^{202m1}$Tl | 572 µs | | 7+ | | | 203,637849 |
| $^{203}$Tl | stabil $^α$ | | 1/2+ | | 029,524 | 204,646514 |
| $^{204}$Tl | 3,78 a | 0,764 (β$^−$), 0,347 (ε) | 2− | β$^−$ = 97,10, ε = 2,90 | | 205,655179 |
| $^{205}$Tl | stabil $^α$ | | 1/2+ | | 070,476 | 206,663844 |
| $^{206}$Tl | 4,199 min | 1,533 | 0− | β$^−$ | | 207,672508 |
| $^{206m1}$Tl | 3,74 min | 2,643 | (12−) | IT | | 207,672508 |
| $^{207}$Tl | 4,77 min | 1,423 | 1/2+ | β$^−$ | | 208,681173 |
| $^{207m1}$Tl | 1,33 s | 1,348 | 11/2− | IT = 100, β$^−$ < 0,1 | | 208,681173 |
| $^{208}$Tl | 3,053 min | 5,001 | 5(+) | β$^−$ | | 209,689838 |
| $^{209}$Tl | 2,20 min | 3,98 | (1/2+) | β$^−$ | | 210,698503 |
| $^{210}$Tl | 1,30 min | 5,484 (β$^−$), 0,299 (β$^−$n) | (5+) | β$^−$ ≈ 100, β$^−$n = 0,007$\left.^{+7}_{-4}\right.$ | | 211,707168 |

## $_{82}$ Blei

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) | NH (%) | Masse (u) |
| $^{181}$Pb | 45 ms | 7,379 (α), 9,3 (εβ$^+$) | (13/2+) | α ≈ 98, εβ$^+$ ≈ 2 | | 180,99665 |
| $^{182}$Pb | 55 ms | 7,076 | 0+ | α <= 100 | | 181,992673 |
| $^{183}$Pb | 300 ms | 7,03 (α), 8,7 (εβ$^+$) | (1/2−) | α ≈ 94, εβ$^+$ ≈ 6 | | 182,99187 |
| $^{184}$Pb | 0,55 s | 6,775 (α), 6,0 (εβ$^+$) | 0+ | α = ?, εβ$^+$ = ? | | 183,988136 |
| $^{185}$Pb | 4,1 s | 6,68 | | α < 100 | | 184,987610 |
| $^{186}$Pb | 4,83 s | 6,471 (α) | 0+ | α = 54, εβ$^+$ = 46 | | 185,984238 |
| $^{187}$Pb | 18,3 s | 7,2 (εβ$^+$), 6,395 (α) | (13/2+) | εβ$^+$ = 98,0, α = 2,0 | | 186,983911 |
| $^{187m1}$Pb | 15,2 s | 7,2 (εβ$^+$), 6,395 (α) | | εβ$^+$ = ?, α = ? | | 186,983911 |
| $^{188}$Pb | 24 s | 4,8 (εβ$^+$), 6,111 (α) | 0+ | εβ$^+$ = 91,5, α = 8,5 | | 187,980875 |
| $^{189}$Pb | 51 s | 6,7 (εβ$^+$), 5,85 (α) | | εβ$^+$ > 99, α ≈ 0,4 | | 188,980844 |
| $^{190}$Pb | 1,2 min | 4,1 (εβ$^+$), 5,698 (α) | 0+ | εβ$^+$ = 99,79, α = 0,21 | | 189,978082 |
| $^{191}$Pb | 1,33 min | 5,9 (εβ$^+$), 5,41 (α) | (3/2−) | εβ$^+$ = 99,987, α = 0,013 | | 190,97828 |
| $^{191m1}$Pb | 2,18 min | 6,038 (εβ$^+$), 5,548 (α) | (13/2+) | εβ$^+$ ≈ 100, α ≈ 0,02 | | 190,97828 |
| $^{192}$Pb | 3,5 min | 3,4 (εβ$^+$), 5,221 (α) | 0+ | εβ$^+$ = 99,9941, α = 0,0059 | | 191,975785 |
| $^{193}$Pb | 2 min | | (3/2−) | εβ$^+$ = ? | | 192,97617 |
| $^{193m1}$Pb | 5,8 min | 5,2 | (13/2+) | εβ$^+$ | | 192,97617 |
| $^{194}$Pb | 12,0 min | 2,7 (εβ$^+$), 4,738 (α) | 0+ | εβ$^+$ ≈ 100, α = 7,3·10$^{−6}$ | | 193,974012 |
| $^{195}$Pb | 15 min | 4,5 | 3/2− | εβ$^+$ | | 194,974549 |
| $^{195m1}$Pb | 15,0 min | 4,701 | 13/2+ | εβ$^+$ | | 194,974549 |
| $^{196}$Pb | 37 min | 2,05 (εβ$^+$), 4,2 (α) | 0+ | εβ$^+$ ≈ 100, α < 3·10$^{−5}$ | | 195,972787 |
| $^{197}$Pb | 8 min | 3,58 | 3/2− | εβ$^+$ | | 196,973435 |
| $^{197m1}$Pb | 43 min | 3,889 (εβ$^+$), 0,319 (IT) | 13/2+ | εβ$^+$ = 81, IT = 19 | | 196,973435 |
| $^{198}$Pb | 2,40 h | 1,41 | 0+ | εβ$^+$ | | 197,972015 |
| $^{199}$Pb | 90 min | 2,88 | 3/2− | εβ$^+$ | | 198,972913 |
| $^{199m1}$Pb | 12,2 min | 0,425 (IT), 3,305 (εβ$^+$) | 13/2+ | IT = 93, εβ$^+$ = 7 | | 198,97291 |
| $^{200}$Pb | 21,5 h | 0,811 | 0+ | ε | | 199,971818 |
| $^{201}$Pb | 9,33 h | 1,90 | 5/2− | εβ$^+$ | | 200,97287 |
| $^{201m1}$Pb | 61 s | 0,629 (IT), 2,529 (εβ$^+$) | 13/2+ | IT > 99, εβ$^+$ < 1 | | 200,97287 |
| $^{202}$Pb | 5,25·10$^4$ a | 0,05 (ε), 2,598 (α) | 0+ | ε = 100, α < 1 | | 201,972152 |
| $^{202m1}$Pb | 3,53 h | 2,17 (IT), 2,22 (εβ$^+$) | 9− | IT = 90,5, εβ$^+$ = 9,5 | | 201,972152 |
| $^{203}$Pb | 51,873 h | 0,975 | 5/2− | ε | | 202,973391 |
| $^{203m1}$Pb | 6,3 s | 0,825 | 13/2+ | IT | | 202,973391 |
| $^{203m2}$Pb | 0,48 s | 2,949 | 29/2− | IT | | 202,973391 |
| 203m3PB | | | | | | 202,973391 |
| $^{204}$Pb | >1,4·10$^{17}$ a | | 0+ | | 001,4 | 203,973044 |
| $^{204m1}$Pb | 67,2 min | 2,186 | 9− | IT | | 203,973044 |
| $^{205}$Pb | 1,53·10$^7$ a | 0,051 | 5/2− | ε | | 204,9744816 |
| $^{205m1}$Pb | 5,54 ms | 1,014 | 13/2+ | IT | | 204,9744816 |
| $^{206}$Pb | stabil $^α$ | | 0+ | | 024,1 | 205,974466 |
| $^{207}$Pb | stabil $^α$ | | 1/2− | | 022,1 | 206,975897 |
| $^{207m1}$Pb | 0,805 s | 1,633 | 13/2+ | IT | | 206,975897 |
| $^{208}$Pb | stabil $^α$ | | 0+ | | 052,4 | 207,976653 |
| $^{209}$Pb | 3,253 h | 0,644 | 9/2+ | β$^−$ | | 208,98040 |
| $^{210}$Pb | 22,3 a | 0,064 (β$^−$), 3,792 (α) | 0+ | β$^−$ ≈ 100, α = 1,9·10$^{−6}$ | | 209,9841883 |
| $^{211}$Pb | 36,1 min | 1,373 | 9/2+ | β$^−$ | | 210,9887354 |
| $^{212}$Pb | 10,64 h | 0,574 | 0+ | β$^−$ | | 211,991896 |
| $^{213}$Pb | 10,2 min | 2,070 | (9/2+) | β$^−$ | | 212,996561 |
| $^{214}$Pb | 26,8 min | 1,024 | 0+ | β$^−$ | | 213,9998038 |
| $^{215}$Pb | 36 s | | (5/2+) | β$^−$ | | 215,00466 |

## $_{83}$ Bismut

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) | NH (%) |
| $^{184m}$Bi | 13 ms | | ? | α ≈ 100 | |
| $^{185}$Bi | 58 µs | | 1/2+ | p ≈ 90, α ≈ 10 | |
| $^{186}$Bi | 14,8 ms | | (3+) | α ≈ 100 | |
| $^{186m1}$Bi | 9,8 ms | | (10−) | α ≈ 100 | |
| $^{187}$Bi | 35 ms | 7,69 | (9/2−) | α > 50 | |
| $^{187m1}$Bi | 370 µs | 7,75 | (1/2+) | α ≈ 100 | |
| $^{188}$Bi | 265 ms | 7,27 | (10-) | α ≈ 100 | |
| $^{188m1}$Bi | 60 ms | | (3+) | α ≈ 100 | |
| $^{189}$Bi | 674 ms | 7,27 (α), 8,0 (εβ$^+$) | (9/2−) | α > 50, εβ$^+$ < 50 | |
| $^{189m1}$Bi | 5 ms | 7,362 (α), 8,092 (εβ$^+$) | (1/2+) | α > 50, εβ$^+$ < 50 | |
| $^{190}$Bi | 6,3 s | 6,862 (α), 9,6 (εβ$^+$) | (3+) | α = 90, εβ$^+$ = 10 | |
| $^{190m1}$Bi | 6,2 s | 6,862 (α), 9,6 (εβ$^+$) | (10−) | α = 70, εβ$^+$ = 30 | |
| $^{191}$Bi | 12,4 s | 6,781 (α), 7,3 (εβ$^+$) | (9/2−) | α = 51, εβ$^+$ = 49 | |
| $^{191m1}$Bi | 125 ms | 7,023 (α) | (1/2+) | α = 68, IT = 32 | |
| $^{192}$Bi | 34,6 s | 9,0 (εβ$^+$), 6,376 (α) | (3+) | εβ$^+$ = 88, α = 12 | |
| $^{192m1}$Bi | 39,6 s | 9,105 (εβ$^+$), 6,481 (α) | (10−) | εβ$^+$ = 90, α = 10 | |
| $^{193}$Bi | 63,6 s | 6,5 (εβ$^+$), 6,305 (α) | (9/2−) | εβ$^+$ = 96,5, α = 3,5 | |
| $^{193m1}$Bi | 3,2 s | 6,612 (α), 6,807 (εβ$^+$) | (1/2+) | α = 84, εβ$^+$ = 16 | |
| $^{194}$Bi | 95 s | 8,2 (εβ$^+$), 5,918 (α) | (3+) | εβ$^+$ = 99,54, α = 0,46 | |
| $^{194m1}$Bi | 115 s | 8,2 (εβ$^+$), 5,918 (α) | (10−) | εβ$^+$ = 99,80, α = 0,20 | |
| $^{194m2}$Bi | 125 s | 8,2 (εβ$^+$), 5,918 (α) | (6+,7+) | εβ$^+$ = 100 | |
| $^{195}$Bi | 183 s | 5,9 (εβ$^+$), 5,833 (α) | (9/2−) | εβ$^+$ = 99,97, α = 0,03 | |
| $^{195m1}$Bi | 87 s | 6,301 (εβ$^+$), 6,234 (α) | (1/2+) | εβ$^+$ = 67, α = 33 | |
| $^{196}$Bi | 308 s | 7,36 (εβ$^+$), 5,46 (α) | (3+) | εβ$^+$ ≈ 100, α = 0,001 | |
| $^{196m1}$Bi | 0,6 s | | (7+) | εβ$^+$, IT | |
| $^{196m2}$Bi | 240 s | 7,629 (εβ$^+$), 0,269 (IT) | (10−) | εβ$^+$ = 74,2, IT = 25,8, α = 0,00038 | |
| $^{197}$Bi | 9,33 min | 5,2 (εβ$^+$), 5,39 (α) | (9/2−) | εβ$^+$ ≈ 100, α = 1·10$^{−4}$ | |
| $^{197m1}$Bi | 5,04 min | 5,89 (α), 5,7 (εβ$^+$), 0,50 (IT) | (1/2+) | α = 55, εβ$^+$ = 45, IT < 0,3 | |
| $^{198}$Bi | 10,3 min | 6,56 | (2+, 3+) | εβ$^+$ | |
| $^{198m1}$Bi | 11,6 min | 6,56 | (7+) | εβ$^+$ | |
| $^{198m2}$Bi | 7,7 s | 0,249 | (10−) | IT | |
| $^{199}$Bi | 27 min | 4,34 | 9/2− | εβ$^+$ | |
| $^{199m1}$Bi | 24,70 min | 5,02 (εβ$^+$), 5,64 (α) | (1/2+) | εβ$^+$ ≈ 99, α ≈ 1 | |
| $^{200}$Bi | 36,4 min | 5,89 | 7+ | εβ$^+$ | |
| $^{200m1}$Bi | 31 min | 5,89 (εβ$^+$), 0,0 (IT) | (2+) | εβ$^+$ > 90, IT < 10 | |
| $^{200m2}$Bi | 0,40 s | 0,428 | (10−) | IT | |
| $^{201}$Bi | 108 min | 3,84 (εβ$^+$), 4,5 (α) | 9/2− | εβ$^+$ ≈ 100, α < 1·10$^{−4}$ | |
| $^{201m1}$Bi | 59,1 min | 4,686 (ε), 5,346 (IT), 5,346 (α) | 1/2+ | ε > 93, IT < 6,8, α ≈ 0,3 | |
| $^{202}$Bi | 1,72 h | 5,15 (εβ$^+$), 4,29 (α) | 5+ | εβ$^+$ ≈ 100, α < 1·10$^{−5}$ | |
| $^{203}$Bi | 11,76 h | 3,253 (εβ$^+$), 4,15 (α) | 9/2− | εβ$^+$ ≈ 100, α ≈ 1·10$^{−5}$ | |
| $^{203m1}$Bi | 303 ms | 1,098 | 1/2+ | IT | |
| $^{204}$Bi | 11,22 h | 4,438 | 6+ | εβ$^+$ | |
| $^{204m1}$Bi | 13,0 ms | 0,805 | 10− | IT | |
| $^{204m2}$Bi | 1,07 ms | 2,833 | (17+) | IT | |
| $^{205}$Bi | 15,31 d | 2,708 | 9/2− | εβ$^+$ | |
| $^{206}$Bi | 6,243 d | 3,758 | 6(+) | εβ$^+$ | |
| $^{207}$Bi | 31,55 a | 2,399 | 9/2− | εβ$^+$ | |
| $^{208}$Bi | 3.68e$^5$ a | 2,880 | (5)+ | εβ$^+$ | |
| $^{208m1}$Bi | 2,58 ms | 1,571 | (10)− | IT | |
| $^{209}$Bi | 1.9e$^{19}$ a | 3,137 | 9/2− | α | 100 |
| $^{210}$Bi | 5,013 d | 1,163 (β$^−$), 5,037 (α) | 1− | β$^−$ ≈ 100 | |
| $^{210m1}$Bi | 3.04e$^6$ a | 5,308 | 9− | α | |
| $^{211}$Bi | 2,14 min | 6,751 (α), 0,579 (β$^−$) | 9/2− | α = 99,724, β$^−$ = 0,276 | |
| $^{212}$Bi | 60,55 min | 2,254 (β$^−$), 6,207 (α), 11,208 (β$^−$+α) | 1(−) | β$^−$ = 64,06, α = 35,94 | |
| $^{212m1}$Bi | 25,0 min | 6,457 (α), 2,504 (β$^−$) | (9−) | α = 67, β$^−$ = 33, β$^−$α = 30 | |
| $^{212m2}$Bi | 7,0 min | 4,164 | | β$^−$ ≈ 100 | |
| $^{213}$Bi | 45,59 min | 1,464 (β$^−$), 5,982 (α) | 9/2− | β$^−$ = 97,91, α = 2,09 | |
| $^{214}$Bi | 19,9 min | 3,272 (β$^−$), 5,617 (α) | 1− | β$^−$ = 99,979, α = 0,021 | |
| $^{215}$Bi | 7,6 min | 2,25 | | β$^−$ | |
| $^{216}$Bi | 3,6 min | 4,0 | (1−) | β$^−$ ≈ 100 | |
| $^{217}$Bi | 97 s | | (9/2−) | β$^−$ | |

## $_{84}$ Polonium

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) |
| $^{190}$Po | 2,0 ms | 7,643 (α) | 0+ | α = 99,9, εβ$^+$ = 0,1 |
| $^{191}$Po | 15,5 ms | 7,471 | | α = ? |
| $^{192}$Po | 0,0332 s | 7,32 (α), 5,7 (εβ$^+$) | 0+ | α ≈ 99, εβ$^+$ ≈ 1 |
| $^{193}$Po | 0,42 s | 7,10 | (3/2−) | α = ? |
| $^{193m1}$Po | 0,24 s | | (13/2+) | α = ? |
| $^{194}$Po | 0,392 s | 6,987 | 0+ | α = 93 |
| $^{195}$Po | 4,64 s | 6,75 (α), 6,8 (εβ$^+$) | (3/2−) | α = 75, εβ$^+$ = 25 |
| $^{195m1}$Po | 1,92 s | 6,98 (α), 7,03 (εβ$^+$), 0,23 (IT) | (13/2+) | α ≈ 90, εβ$^+$ ≈ 10, IT < 0,01 |
| $^{196}$Po | 5,8 s | 6,657 (α), 4,6 (εβ$^+$) | 0+ | α ≈ 98, εβ$^+$ ≈ 2 |
| $^{197}$Po | 53,6 s | 6,2 (εβ$^+$), 6,41 (α) | (3/2−) | εβ$^+$ = 56, α = 44 |
| $^{197m1}$Po | 25,8 s | 6,614 (α), 6,614 (εβ$^+$), 0,204 (IT) | (13/2+) | α = 84, εβ$^+$ = 16, IT = 0,01 |
| $^{198}$Po | 1,77 min | 6,309 (α), 4,02 (εβ$^+$) | 0+ | α = 57, εβ$^+$ = 43 |
| $^{199}$Po | 5,48 min | 5,6 (εβ$^+$), 6,074 (α) | 3/2− | εβ$^+$ = 88, α = 12 |
| $^{199m1}$Po | 4,13 min | 5,91 (εβ$^+$), 6,384 (α), 0,310 (IT) | 13/2+ | εβ$^+$ = 59, α = 39 , IT = 2,1 |
| $^{200}$Po | 11,5 min | 3,35 (εβ$^+$), 5,982 (α) | 0+ | εβ$^+$ = 88,9, α = 11,1 |
| $^{201}$Po | 15,3 min | 4,88 (εβ$^+$), 5,799 (α) | 3/2− | εβ$^+$ = 98,4, α = 1,6 |
| $^{201m1}$Po | 8,9 min | 0,424 (IT), 5,304 (εβ$^+$), 6,223 (α) | 13/2+ | IT = 56, ε = 41, α ≈ 2,9 |
| $^{202}$Po | 44,7 min | 2,82 (εβ$^+$), 5,701 (α) | 0+ | εβ$^+$ = 98,08, α = 1,92 |
| $^{202m1}$Po | 85 ns | | 8+ | |
| $^{202m2}$Po | 200 ns | | 11− | |
| $^{202m3}$Po | 19 ns | | 12+ | |
| $^{202m4}$Po | 11 ns | | (15−) | |
| $^{203}$Po | 36,7 min | 4,23 (εβ$^+$), 5,496 (α) | 5/2− | εβ$^+$ = 99,89, α = 0,11 |
| $^{203m1}$Po | 45 s | 0,641 (IT), 6,137 (α) | 13/2+ | IT ≈ 100, α ≈ 0,04 |
| $^{204}$Po | 3,53 h | 2,34 (εβ$^+$), 5,485 (α) | 0+ | εβ$^+$ = 99,34, α = 0,66 |
| $^{205}$Po | 1,66 h | 3,53 (εβ$^+$), 5,324 (α) | 5/2− | εβ$^+$ = 99,96, α = 0,04 |
| $^{205m1}$Po | 58 ms | | 19/2− | IT |
| $^{206}$Po | 8,8 d | 1,846 (εβ$^+$), 5,326 (α) | 0+ | εβ$^+$ = 94,55, α = 5,45 |
| $^{207}$Po | 5,80 h | 2,909 (εβ$^+$), 5,216 (α) | 5/2− | εβ$^+$ = 99,979, α = 0,021 |
| $^{207m1}$Po | 2,8 s | 1,383 | 19/2− | IT |
| $^{208}$Po | 2,898 a | 5,215 (α), 1,401 (εβ$^+$) | 0+ | α = 99,9958, εβ$^+$ = 0,0042 |
| $^{209}$Po | 102 a | 4,879 (α), 1,893 (εβ$^+$) | 1/2− | α = 99,52, εβ$^+$ = 0,48 |
| $^{210}$Po | 138,376 d | 5,307 | 0+ | α |
| $^{211}$Po | 0,516 s | 7,595 | 9/2+ | α |
| $^{211m1}$Po | 25,2 s | 9,057 (α), 1,462 (IT) | (25/2+) | α = 99,984, IT = 0,016 |
| $^{212}$Po | 0,299 µs | | 0+ | α |
| $^{212m1}$Po | 45,1 s | | (18+) | α = 99,93, IT = 0,07 |
| $^{213}$Po | 4,2 µs | 8,537 | 9/2+ | α |
| $^{214}$Po | 164,3 µs | 7,833 | 0+ | α |
| $^{214m1}$Po | 99 ps | 1,416 (IT), 9,248 (α) | 0+ | IT = 0,14, α = 99,86 |
| $^{215}$Po | 1,781 ms | 7,526 (α), 0,721 (β$^−$) | 9/2+ | α ≈ 100, β$^−$ = 2,3·10$^{−4}$ |
| $^{216}$Po | 0,145 s | 6,906 | 0+ | α |
| $^{217}$Po | 10 s | | | α > 95, β$^−$ < 5 |
| $^{218}$Po | 3,10 min | 6,115 (α), 0,265 (β$^−$) | 0+ | α = 99,980 , β$^−$ = 0,020 |

## $_{85}$ Astat

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) |
| $^{190}$At | 1ms (+1,4ms / −0,4ms) | | | α = 7750(20) keV |
| $^{193}$At | 40 ms | | | α = ? |
| $^{194}$At | 40 ms | 7,31 | | α = ? |
| $^{194m1}$At | 250 ms | | | α = ? |
| $^{195}$At | 0,63 s | 7,4 (α), 8,0 (εβ$^+$) | | α > 75, εβ$^+$ < 25 |
| $^{196}$At | 0,253 s | 7,2 | | α ≈ 100 |
| $^{197}$At | 0,35 s | 7,1 (α), 7,2 (εβ$^+$) | (9/2−) | α = 96, εβ$^+$ = 4 |
| $^{197m1}$At | 3,7 s | 7,152 (α), 7,252 (εβ$^+$) | (1/2+) | α = ?, εβ$^+$ = ? |
| $^{198}$At | 4,2 s | 6,893 (α), 8,8 (εβ$^+$) | (3+) | α = 90, εβ$^+$ = 10 |
| $^{198m1}$At | 1,0 s | 6,995 (α), 8,902 (εβ$^+$) | (10−) | α = 84, εβ$^+$ = 16 |
| $^{199}$At | 7,2 s | 6,78 (α), 6,6 (εβ$^+$) | (9/2−) | α = 90, εβ$^+$ = 10 |
| $^{200}$At | 43 s | 6,596 (α), 7,97 (εβ$^+$) | (3+) | α = 57, εβ$^+$ = 43 |
| $^{200m1}$At | 47 s | 8,074 (εβ$^+$), 6,70 (α) | (7+) | εβ$^+$ < 57, α = 43 |
| $^{200m2}$At | 3,5 s | 0,335 (IT), 6,931 (α), 8,305 (εβ$^+$) | (10−) | IT ≈ 85, α ≈ 10,5, ε ≈ 4,5 |
| $^{201}$At | 89 s | 6,473 (εβ$^+$), 5,85 (α) | (9/2−) | α = 71, εβ$^+$ = 29 |
| $^{202}$At | 184 s | 7,21 (εβ$^+$), 6,354 (α) | (2,3)+ | εβ$^+$ = 82, α = 18 |
| $^{202m1}$At | 182 s | 7,21 (εβ$^+$), 6,354 (α) | (7+) | εβ$^+$ = 91,3, α = 8,7 |
| $^{202m2}$At | 0,46 s | 0,392 (IT), 7,602 (α), 6,746 (εβ$^+$) | (10−) | IT = 99,65, εβ$^+$ = 0,25, α = 0,096 |
| $^{203}$At | 7,4 min | 5,06 (εβ$^+$), 6,21 (α) | 9/2− | εβ$^+$ = 69, α = 31 |
| $^{204}$At | 9,2 min | 6,48 (εβ$^+$), 6,07 (α) | 7+ | εβ$^+$ = 96,2 , α = 3,8 |
| $^{204m1}$At | 108 ms | 0,587 | (10−) | IT |
| $^{205}$At | 26,2 min | 4,54 (εβ$^+$), 6,02 (α) | 9/2− | εβ$^+$ = 90, α = 10 |
| $^{206}$At | 30,0 min | 5,72 (εβ$^+$), 5,888 (α) | (5)+ | εβ$^+$ = 99,11, α = 0,89 |
| $^{207}$At | 1,80 h | 3,91 (εβ$^+$), 5,873 (α) | 9/2− | εβ$^+$ = 91,4, α = 8,6 |
| $^{208}$At | 1,63 h | 4,973 (εβ$^+$), 5,751 (α) | 6+ | εβ$^+$ = 99,45, α = 0,55 |
| $^{209}$At | 5,41 h | 3,486 (εβ$^+$), 5,757 (α) | 9/2− | εβ$^+$ = 95,9, α = 4,1 |
| $^{210}$At | 8,1 h | 3,981 (εβ$^+$), 5,631 (α) | (5)+ | εβ$^+$ = 99,825, α = 0,175 |
| $^{211}$At | 7,214 h | 0,786 (εβ$^+$), 5,982 (α) | 9/2− | ε = 58,2, α = 41,8 |
| $^{212}$At | 0,314 s | 7,829 (α), 1,754 (εβ$^+$), 0,043 (β$^−$) | (1−) | α ≈ 100, εβ$^+$ < 0,03, β$^−$ < 2·10$^{−6}$ |
| $^{212m1}$At | 0,119 s | 8,051 (α), 0,222 (IT) | (9−) | α > 99, IT < 1 |
| $^{213}$At | 125 ns | 9,254 | 9/2− | α |
| $^{214}$At | 558 ns | 8,987 | 1− | α |
| $^{214m1}$At | 265 ns | 9,046 | | α < 100 |
| $^{214m2}$At | 760 ns | 9,218 | 9− | α <= 100 |
| $^{215}$At | 0,10 ms | 8,178 | 9/2− | α |
| $^{216}$At | 0,30 ms | 7,949 (α), 0,469 (ε), 2,003 (β$^−$) | 1− | α ≈ 100, ε < 3·10$^{−7}$, β$^−$ < 6·10$^{−3}$ |
| $^{216m1}$At | 0,1 ms | 8,362 | (9−) | α <= 100 |
| $^{217}$At | 32,3 ms | 5,982 (α), 0,786 (εβ$^+$) | 9/2− | α = 99,988, β$^−$ = 0,012 |
| $^{218}$At | 1,5 s | 6,874 (α), 2,883 (εβ$^+$) | | α = 99,9, β$^−$ = 0,1 |
| $^{219}$At | 56 s | 6,39 (α), 1,70 (εβ$^+$) | | α ≈ 97, β$^−$ ≈ 3 |
| $^{220}$At | 3,71 min | 3,65 (εβ$^+$), 6,05 (α) | 3 | α = 8, β$^−$ = 92 |
| $^{221}$At | 2,3 min | | | β$^−$ |
| $^{222}$At | 54 s | 4,4 | | β$^−$ |
| $^{223}$At | 50 s | | | β$^−$ ≈ 100, α = 0,008 |

## $_{86}$ Radon

| Isotop | Halbwerts­zeit | Zerfalls­energie (MeV) | Spin / Parität | Zerfallsart(en) (%) |
| $^{196}$Rn | 3 ms | | 0+ | α ≈ 100 |
| $^{197}$Rn | 65 ms | | (3/2−) | α ≈ 100 |
| $^{197m1}$Rn | 19 ms | | (13/2+) | α |
| $^{198}$Rn | 64 ms | 7,345 (α), 5,6 (εβ$^+$) | 0+ | α ≈ 100, εβ$^+$ ≈ 0 |
| $^{199}$Rn | 0,62 s | 7,14 (α), 7,2 (εβ$^+$) | (3/2−) | α = 94, εβ$^+$ = 6 |
| $^{199m1}$Rn | 0,32 s | | (13/2+) | α = 97, εβ$^+$ = 3 |
| $^{200}$Rn | 0,96 s | 7,043 (α), 5,0 (εβ$^+$) | 0+ | α = 86$\left.^{+14}_{-4}\right.$, εβ$^+$ < 18 |
| $^{201}$Rn | 7,0 s | 6,86 (α), 6,6 (εβ$^+$) | (3/2−) | α ≈ 80, εβ$^+$ ≈ 20 |
| $^{201m1}$Rn | 3,8 s | 7,14 (α), 6,88 (εβ$^+$), 0,28 (IT) | (13/2+) | α ≈ 90, εβ$^+$ ≈ 10, IT ≈ 0 |
| $^{202}$Rn | 10,0 s | 6,774 (α), 4,44 (εβ$^+$) | 0+ | α = 86, εβ$^+$ = 14 |
| $^{203}$Rn | 45 s | 6,63 (α), 6,0 (εβ$^+$) | (3/2, 5/2)− | α = 66, εβ$^+$ = 34 |
| $^{203m1}$Rn | 28 s | 6,991 (α), 6,361 (εβ$^+$), 0,361 (IT) | (13/2+) | α ≈ 80, εβ$^+$ ≈ 20, IT < 0,1 |
| $^{204}$Rn | 1,24 min | 6,546 (α), 3,82 (εβ$^+$) | 0+ | α = 73, εβ$^+$ = 27 |
| $^{205}$Rn | 2,8 min | 5,24 (εβ$^+$), 6,39 (α) | 5/2− | εβ$^+$ = 77, α = 23 |
| $^{206}$Rn | 5,67 min | 6,384 (α), 3,31 (εβ$^+$) | 0+ | α = 63, εβ$^+$ = 37 |
| $^{207}$Rn | 9,25 min | 4,61 (εβ$^+$), 6,251 (α) | 5/2− | εβ$^+$ = 79, α = 21 |
| $^{208}$Rn | 24,35 min | 6,26 (α), 2,85 (εβ$^+$) | 0+ | α = 62, εβ$^+$ = 38 |
| $^{209}$Rn | 28,5 min | 3,93 (εβ$^+$), 6,155 (α) | 5/2− | εβ$^+$ = 83, α = 17 |
| $^{210}$Rn | 2,4 h | 6,159 (α), 2,374 (εβ$^+$) | 0+ | α = 96, εβ$^+$ = 4 |
| $^{211}$Rn | 14,6 h | 2,892 (εβ$^+$), 5,965 (α) | 1/2− | ε = 72,6, α = 27,4 |
| $^{212}$Rn | 23,9 min | 6,385 | 0+ | α |
| $^{213}$Rn | 25,0 ms | 8,243 | (9/2+) | α |
| $^{214}$Rn | 0,27 µs | 9,208 | 0+ | α |
| $^{214m1}$Rn | 0,69 ns | 1,443 (IT), 10,651 (α) | 6+ | IT < 100, α > 0 |
| $^{214m2}$Rn | 6,5 ns | 1,625 (IT), 10,833 (α) | 8+ | IT ≈ 90, α ≈ 10 |
| $^{215}$Rn | 2,30 µs | 8,839 | 9/2+ | α |
| $^{216}$Rn | 45 µs | 8,20 | 0+ | α |
| $^{217}$Rn | 0,54 ms | 7,889 | 9/2+ | α |
| $^{218}$Rn | 35 ms | 7,263 | 0+ | α |
| $^{219}$Rn | 3,96 s | 6,945 | 5/2+ | α |
| $^{220}$Rn | 55,6 s | 6,405 | 0+ | α |
| $^{221}$Rn | 25 min | 1,22 (β$^−$), 6,146 (α) | 7/2(+) | β$^−$ = 78, α = 22 |
| $^{222}$Rn | 3,8235 d | 5,59 | 0+ | α |
| $^{223}$Rn | 23,2 min | | 7/2 | β$^−$ ≈ 100, α = 0,0004 |
| $^{224}$Rn | 107 min | 0,8 | 0+ | β$^−$ |
| $^{225}$Rn | 4,5 min | | 7/2− | β$^−$ |
| $^{226}$Rn | 7,4 min | 1,4 | 0+ | β$^−$ |
| $^{227}$Rn | 22,5 s | | | β$^−$ |
| $^{228}$Rn | 65 s | 2,2 | 0+ | β$^−$ |
| $^{229}$Rn | 12 s | | | |

## $_{87}$ Francium

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) |
| $^{200}$Fr | 19 ms | | (3+) | α |
| $^{200m1}$Fr | 0,57 s | | (10−) | α |
| $^{201}$Fr | 48 ms | 7,54 (α), 7,9 (εβ$^+$) | (9/2−) | α ≈ 100, εβ$^+$ < 1 |
| $^{202}$Fr | 0,34 s | 7,389 (α), 9,4 (εβ$^+$) | (3+) | α ≈ 97, εβ$^+$ ≈ 3 |
| $^{202m1}$Fr | 0,34 s | 7,491 (α), 9,502 (εβ$^+$) | (10−) | α ≈ 97, εβ$^+$ ≈ 3 |
| $^{203}$Fr | 0,55 s | 7,28 (α), 7,2 (εβ$^+$) | (9/2−) | α ≈ 95, εβ$^+$ ≈ 5 |
| $^{204}$Fr | 1,7 s | 7,17 (α), 8,6 (εβ$^+$) | (3+) | α ≈ 80, εβ$^+$ ≈ 20 |
| $^{204m1}$Fr | 2,6 s | 7,211 | (7+) | α = ? |
| $^{204m2}$Fr | 1 s | 7,486 (α), 0,316 (IT) | (10−) | α ≈ 100, IT < 1 |
| $^{205}$Fr | 3,85 s | 7,06 (α), 6,52 (εβ$^+$) | (9/2−) | α ≈ 100, εβ$^+$ < 1 |
| $^{206}$Fr | 15,9 s | 6,926 (α), 7,75 (εβ$^+$) | (5+) | α = 84, εβ$^+$ = 16 |
| $^{206m1}$Fr | | 6,926 | | α < 84 |
| $^{206m2}$Fr | 0,7 s | 7,576 (α), 0,65 (IT) | (10−) | α = 0,3, IT = ? |
| $^{207}$Fr | 14,8 s | 6,9 (α), 5,71 (εβ$^+$) | 9/2− | α = 95, εβ$^+$ = 5 |
| $^{208}$Fr | 59,1 s | 6,77 (α), 6,99 (εβ$^+$) | 7+ | α = 90, εβ$^+$ = 10 |
| $^{209}$Fr | 50,0 s | 6,777 (α), 5,16 (εβ$^+$) | 9/2− | α = 89, εβ$^+$ = 11 |
| $^{210}$Fr | 3,18 min | 6,7 (α), 6,262 (εβ$^+$) | 6+ | α = 60, εβ$^+$ = 40 |
| $^{211}$Fr | 3,10 min | 6,66 (α), 4,605 (εβ$^+$) | 9/2− | α > 80, ε < 20 |
| $^{212}$Fr | 20,0 min | 5,117 (εβ$^+$), 6,529 (α) | 5+ | εβ$^+$ = 57, α = 43 |
| $^{213}$Fr | 34,6 s | 6,905 (α), 2,148 (εβ$^+$) | 9/2− | α ≈ 100, εβ$^+$ = 0,55 |
| $^{214}$Fr | 5,0 ms | 8,589 | (1−) | α |
| $^{214m1}$Fr | 3,35 ms | 8,711 | (8−) | α |
| $^{215}$Fr | 86 ns | 9,540 | 9/2− | α |
| $^{215m1}$Fr | 3,5 ns | | (23/2)− | |
| $^{216}$Fr | 0,70 µs | 9,175 (α), 2,729 (ε) | (1−) | α ≈ 100, ε < 2·10$^{−7}$ |
| $^{216m1}$Fr | 71 ns | 0,086 | (23/2)− | IT |
| $^{217}$Fr | 22 µs | 8,469 | 9/2− | α |
| $^{218}$Fr | 1,0 ms | 8,014 | 1− | α |
| $^{218m1}$Fr | 22,0 ms | 8,1 (α), 0,086 (IT) | | α ≈ 100, IT = ? |
| $^{219}$Fr | 20 ms | 7,449 | 9/2− | α |
| $^{220}$Fr | 27,4 s | 6,801 (α), 1,209 (β$^−$) | 1+ | α ≈ 100, β$^−$ = 0,35 |
| $^{221}$Fr | 4,9 min | 6,458 (α), 2,033 (β$^−$), 31,292 ($^{14}$C) | 5/2− | α ≈ 100, β$^−$ = ?, $^{14}$C = 8,8·10$^{−11}$ |
| $^{222}$Fr | 14,2 min | 2,033 | 2− | β$^−$ |
| $^{223}$Fr | 21,8 min | 1,149 (β$^−$), 5,43 (α) | 3/2(−) | β$^−$ ≈ 100, α = 0,006 |
| $^{224}$Fr | 3,33 min | 2,83 | 1− | β$^−$ |
| $^{225}$Fr | 4,0 min | 1,866 | 3/2− | β$^−$ |
| $^{226}$Fr | 49 s | 3,67 | 1− | β$^−$ |
| $^{227}$Fr | 2,47 min | 2,49 | 1/2+ | β$^−$ |
| $^{228}$Fr | 38 s | 4,34 | 2− | β$^−$ |
| $^{229}$Fr | 50 s | | | β$^−$ |
| $^{230}$Fr | 19,1 s | | | β$^−$ |
| $^{231}$Fr | 17,5 s | | | β$^−$ |
| $^{232}$Fr | 5 s | | | β$^−$ |

## $_{88}$ Radium

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) |
| $^{202}$Ra | 0,7 ms | | 0+ | α |
| $^{203}$Ra | 1,0 ms | | (3/2−) | α ≈ 100 |
| $^{203m1}$Ra | 33 ms | | (13/2+) | α ≈ 100 |
| $^{204}$Ra | 59 ms | 7,65 | 0+ | α ≈ 100 |
| $^{205}$Ra | 210 ms | 7,51 (α), 7,0 (εβ$^+$) | (3/2−) | α = ?, εβ$^+$ = ? |
| $^{205m1}$Ra | 170 ms | | (13/2+) | α = ? |
| $^{206}$Ra | 0,24 s | 7,416 | 0+ | α ≈ 100 |
| $^{207}$Ra | 1,3 s | 7,27 (α), 6,4 (εβ$^+$) | (5/2, 3/2)− | α ≈ 90, εβ$^+$ ≈ 10 |
| $^{207m1}$Ra | 55 ms | 0,47 (IT), 7,74 (α), 6,87 (εβ$^+$) | (13/2+) | IT ≈ 85, α ≈ 15, εβ$^+$ ≈ 0,55 |
| $^{208}$Ra | 1,3 s | 7,273 (α), 4,33 (εβ$^+$) | 0+ | α = 95, εβ$^+$ = 5 |
| $^{209}$Ra | 4,6 s | | 5/2− | α ≈ 90, εβ$^+$ ≈ 10 |
| $^{210}$Ra | 3,7 s | 7,157 (α), 3,77 (εβ$^+$) | 0+ | α ≈ 96, εβ$^+$ ≈ 4 |
| $^{211}$Ra | 13 s | 7,046 (α), 5,0 (ε) | 5/2(−) | α > 93, ε < 7 |
| $^{212}$Ra | 13,0 s | 6,859 (α), 3,35 (εβ$^+$) | 0+ | α ≈ 85, εβ$^+$ ≈ 15 |
| $^{213}$Ra | 2,74 min | 6,859 (α), 3,88 (εβ$^+$) | 1/2− | α = 80, εβ$^+$ = 20 |
| $^{213m1}$Ra | 2,1 ms | 1,77 (IT), 8,628 (α) | | IT ≈ 99, α ≈ 1 |
| $^{214}$Ra | 2,46 s | 7,273 (α), 1,059 (ε) | 0+ | α ≈ 100, ε = 0,059 |
| $^{215}$Ra | 1,59 ms | 8,864 | (9/2+) | α |
| $^{216}$Ra | 182 ns | 9,526 (α), 0,308 (ε) | 0+ | α ≈ 100, ε < 1·10$^{−8}$ |
| $^{216m1}$Ra | <0,2 ns | 1,507 (IT), 11,034 (α) | 6+ | α = 0,58 |
| $^{216m2}$Ra | 1,24 ns | 1,711 (IT), 11,237 (α) | 8+ | α = 1,86 |
| $^{216m3}$Ra | 0,6 ns | 2,026 (IT), 11,552 (α) | 10+ | α = 0,12 |
| $^{217}$Ra | 1,6 µs | 9,161 | (9/2+) | α |
| $^{218}$Ra | 25,6 µs | 8,546 | 0+ | α |
| $^{219}$Ra | 10 ms | 8,130 | (7/2)+ | α |
| $^{220}$Ra | 18 ms | 7,595 | 0+ | α |
| $^{221}$Ra | 28 s | 6,886 (α), 32,395 ($^{14}$C) | 5/2+ | α ≈ 100, $^{14}$C = 1,2·10$^{−10}$ |
| $^{222}$Ra | 38,0 s | 6,681 (α), 33,049 ($^{14}$C) | 0+ | α ≈ 100, $^{14}$C = 3,0·10$^{−8}$ |
| $^{223}$Ra | 11,435 d | 5,979 (α), 31,828 ($^{14}$C) | 3/2+ | α ≈ 100, $^{14}$C = 6,4·10$^{−8}$ |
| $^{224}$Ra | 3,66 d | 5,789 (α), 30,535 ($^{14}$C) | 0+ | α ≈ 100, $^{14}$C = 4,3·10$^{−9}$ |
| $^{225}$Ra | 14,9 d | 0,357 | 1/2+ | β$^−$ |
| $^{226}$Ra | 1602 a | 4,871 (α), 28,196 ($^{14}$C) | 0+ | α ≈ 100, $^{14}$C = 3,2·10$^{−9}$ |
| $^{227}$Ra | 42,2 min | 1,325 | 3/2+ | β$^−$ |
| $^{228}$Ra | 5,75 a | 0,046 | 0+ | β$^−$ |
| $^{229}$Ra | 4,0 min | 1,76 | 5/2(+) | β$^−$ |
| $^{230}$Ra | 93 min | 0,99 | 0+ | β$^−$ |
| $^{231}$Ra | 103 s | | (7/2−, 1/2+) | β$^−$ |
| $^{232}$Ra | 250 s | | 0+ | β$^−$ |
| $^{233}$Ra | 30 s | | | β$^−$ |
| $^{234}$Ra | 30 s | | 0+ | β$^−$ |

## $_{89}$ Actinium

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) |
| $^{206}$Ac | 22 ms | | (3+) | α = ? |
| $^{206m1}$Ac | 33 ms | | (10−) | |
| $^{207}$Ac | 22 ms | | (9/2−) | α ≈ 100 |
| $^{208}$Ac | 95 ms | | (3+) | α = ? |
| $^{208m1}$Ac | 25 ms | | (10−) | α = ? |
| $^{209}$Ac | 0,10 s | 7,73 (α), 7,11 (εβ$^+$) | (9/2−) | α ≈ 99, εβ$^+$ ≈ 1 |
| $^{210}$Ac | 0,35 s | 7,61 (α), 8,2 (εβ$^+$) | | α ≈ 96, εβ$^+$ ≈ 4 |
| $^{211}$Ac | 0,25 s | 7,62 | | α ≈ 100 |
| $^{212}$Ac | 0,93 s | 7,52 (α), 7,48 (εβ$^+$) | | α ≈ 97, εβ$^+$ ≈ 3 |
| $^{213}$Ac | 0,80 s | 7,5 | | α < 100 |
| $^{214}$Ac | 8,2 s | 7,35 (α), 6,34 (ε) | | α > 89, ε < 11 |
| $^{215}$Ac | 0,17 s | 7,75 (α), 3,49 (εβ$^+$) | 9/2− | α ≈ 100, εβ$^+$ = 0,09 |
| $^{216}$Ac | 0,33 ms | 9,243 | (1−) | α |
| $^{216m1}$Ac | 0,33 ms | 0,037 (IT), 9,28 (α) | (9−) | IT ≈ 100, α ≤ 2 |
| $^{217}$Ac | 69 ns | 9,832 (α), 2,819 (εβ$^+$) | 9/2− | α ≈ 100, εβ$^+$ < 2 |
| $^{217m1}$Ac | 740 ns | | (29/2)+ | |
| $^{218}$Ac | 1,08 µs | 9,38 | (1−) | α |
| $^{219}$Ac | 11,8 µs | 8,83 (α) | 9/2− | α ≈ 100, εβ$^+$ ≈ 1·10$^{−6}$ |
| $^{220}$Ac | 26,4 ms | 8,35 (α), 3,48 (εβ$^+$) | (3−) | α ≈ 100, εβ$^+$ = 5·10$^{−4}$ |
| $^{221}$Ac | 52 ms | 7,78 | (3/2−) | α |
| $^{222}$Ac | 5,0 s | 7,137 (α), 2,298 (εβ$^+$) | 1− | α = 99, εβ$^+$ = 1 |
| $^{222m1}$Ac | 63 s | 7,137 (α), 0 (IT), 2,298 (εβ$^+$) | | α > 88, IT < 10, εβ$^+$ < 0,7 |
| $^{223}$Ac | 2,10 min | 6,783 (α), 0,586 (ε), 33,064 ($^{14}$C), 39,473 ($^{15}$N) | (5/2−) | α ≈ 100, ε = 1, $^{14}$C = 3·10$^{−9}$, $^{15}$N = 2·10$^{−11}$ |
| $^{224}$Ac | 2,78 h | 1,403 (ε), 6,327 (α), 0,232 (β$^−$) | 0− | ε = 90,9$\left.^{+14}_{-10}\right.$, α = 9,1$\left.^{+20}_{-14}\right.$, β$^−$ < 1,6 |
| $^{225}$Ac | 10,0 d | 5,935 (α), 30,476 ($^{14}$C) | (3/2−) | α ≈ 100, $^{14}$C = 6,0·10$^{−10}$ |
| $^{226}$Ac | 29,37 h | 1,117 (β$^−$), 0,64 (ε), 5,563 (α) | (1) | β$^−$ ≈ 83, ε = 17, α = 6·10$^{−3}$ |
| $^{227}$Ac | 21,773 a | 0,045 (β$^−$), 5,042 (α) | 3/2− | β$^−$ ≈ 100, α = 1,380 |
| $^{228}$Ac | 6,15 h | 2,127 | 3+ | β$^−$ |
| $^{229}$Ac | 62,7 min | 1,1 | (3/2+) | β$^−$ |
| $^{230}$Ac | 122 s | 2,7 | (1+) | β$^−$ |
| $^{231}$Ac | 7,5 min | 2,1 | (1/2+) | β$^−$ |
| $^{232}$Ac | 119 s | 3,7 | (1+) | β$^−$ |
| $^{233}$Ac | 145 s | | (1/2+) | β$^−$ |
| $^{234}$Ac | 44 s | | | β$^−$ |

## $_{90}$ Thorium

| Iso­top | Halbwerts­zeit | Zerfallsenergie (MeV) | Spin / Parität | Zerfallsart(en) (%) | NH (%) |
| $^{210}$Th | 9 ms | | 0+ | α ≈ 100 | |
| $^{211}$Th | 37 ms | | | α = ?, ε = ? | |
| $^{212}$Th | 30 ms | 7,952 (α), 4,76 (εβ$^+$) | 0+ | α ≈ 100, εβ$^+$ ≈ 0,3 | |
| $^{213}$Th | 140 ms | 7,84 | | α < 100 | |
| $^{214}$Th | 100 ms | 7,826 | 0+ | α | |
| $^{215}$Th | 1,2 s | 7,666 | (1/2−) | α | |
| $^{216}$Th | 0,028 s | 8,071 (α), 2,17 (εβ$^+$) | 0+ | α ≈ 100, εβ$^+$ ≈ 0,01 | |
| $^{216m1}$Th | 180 µs | 2,028 (IT), 10,099 (α) | (8+, 11−) | IT ≈ 97, α ≈ 3 | |
| $^{217}$Th | 0,252 ms | 9,424 | (9/2+) | α | |
| $^{218}$Th | 109 ns | 9,849 | 0+ | α | |
| $^{219}$Th | 1,05 µs | 9,51 | | α ≈ 100, εβ$^+$ ≈ 1·10$^{−7}$ | |
| $^{220}$Th | 9,7 µs | 8,953 (α), 0,91 (εβ$^+$) | 0+ | α ≈ 100, ε = 2·10$^{−7}$ | |
| $^{221}$Th | 1,68 ms | 8,628 | (7/2+) | α | |
| $^{222}$Th | 2,8 ms | 8,129 | 0+ | α | |
| $^{223}$Th | 0,60 s | 7,567 | (5/2)+ | α | |
| $^{224}$Th | 1,05 s | 7,304 | 0+ | α | |
| $^{225}$Th | 8,72 min | 6,922 (α), 0,675 (ε) | (3/2)+ | α ≈ 90, ε ≈ 10 | |
| $^{226}$Th | 30,57 min | 6,451 (α), 15,3 ($^{18}$O) | 0+ | α ≈ 100, $^{18}$O = 9,2·10$^{−11}$ | |
| $^{227}$Th | 18,72 d | 0,638 (γ), 6,051 (α) | (1/2+) | α | |
| $^{228}$Th | 1,9116 a | 0,087 (γ), 5,520 (α), 44,722 ($^{20}$O) | 0+ | α ≈ 100, $^{20}$O = 1,13·10$^{−11}$ | |
| $^{229}$Th | 7917 a | 5,168 | 5/2+ | α | |
| $^{230}$Th | 7,538·10$^4$ a | 0,2 (γ), 4,770 (α), 57,761 ($^{24}$Ne) | 0+ | α ≈ 100, $^{24}$Ne = 5,6·10$^{−11}$, SF < 3,8·10$^{−12}$ | |
| $^{231}$Th | 25,52 h | 0,085 (γ), 0,389 (β$^−$), 4,213 (α) | 5/2+ | β$^−$ ≈ 100, α ≈ 1·10$^{−8}$ | |
| $^{232}$Th | 1,405·10$^{10}$ a | 4,083 (α), 0,055 (γ), 54,509 ($^{24}$Ne), 55,964 ($^{26}$Ne) | 0+ | α ≈ 100, SF < 1,8·10$^{−9}$, $^{24}$Ne = 2,8·10$^{−10}$, $^{26}$Ne = 2,8·10$^{−10}$ | 100 |
| $^{233}$Th | 22,3 min | 1,245 | 1/2+ | β$^−$ | |
| $^{234}$Th | 24,10 d | 0,09 (γ), 0,273 | 0+ | β$^−$ | |
| $^{235}$Th | 7,1 min | 1,93 | (1/2+) | β$^−$ | |
| $^{236}$Th | 37,5 min | | 0+ | β$^−$ | |
| $^{237}$Th | 5,0 min | | | β$^−$ | |

## Quellen

* ↑ Datenquelle
Siehe auch Liste der Isotope#Weblinks
bis 10 ∙ 11 bis 20 ∙ 21 bis 30 ∙ 31 bis 40 ∙ 41 bis 50 ∙ 51 bis 60 ∙ 61 bis 70 ∙ 71 bis 80 ∙ 81 bis 90 ∙ 91 bis 100 ∙ ab 101