Pa
Протактиній
Z 91 231,036 г/мольАктиноїд Радіоактивний
| 231Pa | 140 | 231,0359 | 33 424,3 | 100,0% | 32,65 кр | 3/2- | α→227Ac(~100%) CD→207Tl(1,34е-9%) SF(<3е-10%) CD→208Pb(9,9е-13%) | 1918 |
| 211Pa | 120 | 211,0237 | 22 050,0 | --- | 6,0 мс | 9/2- | α→207Ac(100%) β⁺→211Th p→210Th | 2006 |
| 212Pa | 121 | 212,0232 | 21 600,0 | --- | 5,8 мс | (3+) | α→208Ac(100%) | 1997 |
| 213Pa | 122 | 213,0211 | 19 650,0 | --- | 7,4 мс | 9/2- | α→209Ac(100%) | 1995 |
| 214Pa | 123 | 214,0209 | 19 460,0 | --- | 17,0 мс | (7+) | α→210Ac(100%) | 1995 |
| 215Pa | 124 | 215,0191 | 17 800,0 | --- | 14,0 мс | 9/2- | α→211Ac(100%) | 1979 |
| 216Pa | 125 | 216,0191 | 17 824,0 | --- | 105,0 мс | (5+) | α→212Ac(100%) β⁺→216Th | 1972 |
| 217Pa | 126 | 217,0183 | 17 055,0 | --- | 3,8 мс | 9/2- | α→213Ac(100%) β⁻→217U | 1968 |
| 217mPa | 126 | 217,0203 | 18 915,0 | --- | 1,08 мс | (23/2-) | α→213Ac(73%) γ→217Pa | 1979 |
| 218Pa | 127 | 218,02 | 18 650,0 | --- | 108,0 мкс | (8-) | α→214Ac(100%) | 1979 |
| 218mPa | 127 | 218,0201 | 18 731,0 | --- | 150,0 мкс | (1-) | α→214Ac(100%) | 1979 |
| 219Pa | 128 | 219,0199 | 18 580,0 | --- | 56,0 нс | 9/2- | α→215Ac(100%) β⁺→219Th | 2005 |
| 220Pa | 129 | 220,0218 | 20 278,0 | --- | 850,0 нс | (1-) | α→216Ac(100%) β⁺→220Th | 2005 |
| 220mPa | 129 | 220,0218 | 20 304,0 | --- | 410,0 нс | --- | α→216Ac(100%) | 2018 |
| 220nPa | 129 | 220,0221 | 20 570,0 | --- | 260,0 нс | --- | α→216Ac(100%) | 2018 |
| 221Pa | 130 | 221,0219 | 20 370,0 | --- | 5,9 мкс | 9/2- | α→217Ac(100%) | 1983 |
| 222Pa | 131 | 222,0237 | 22 060,0 | --- | 3,8 мс | (1-) | α→218Ac(100%) | 1970 |
| 223Pa | 132 | 223,024 | 22 340,0 | --- | 5,3 мс | 9/2- | α→219Ac(100%) β⁺→223Th | 1970 |
| 224Pa | 133 | 224,0256 | 23 862,0 | --- | 844,0 мс | (5-) | α→220Ac(100%) β⁺→224Th | 1958 |
| 225Pa | 134 | 225,0262 | 24 360,0 | --- | 1,71 с | (5/2-) | α→221Ac(100%) | 1958 |
| 226Pa | 135 | 226,0279 | 26 034,0 | --- | 1,8 хв | (1-) | α→222Ac(74%) β⁺→226Th(26%) | 1949 |
| 227Pa | 136 | 227,0288 | 26 830,0 | --- | 38,3 хв | (5/2-) | α→223Ac(85%) EC→227Th(15%) | 1948 |
| 228Pa | 137 | 228,0311 | 28 924,0 | --- | 22,0 год | 3+ | β⁺→228Th(98,15%) α→224Ac(1,85%) | 1948 |
| 229Pa | 138 | 229,0321 | 29 897,0 | --- | 1,55 д | 5/2+ | EC→229Th(99,51%) α→225Ac(0,49%) | 1949 |
| 229mPa | 138 | 229,0321 | 29 909,0 | --- | 420,0 нс | 3/2- | γ→229Pa(100%) | 1982 |
| 230Pa | 139 | 230,0345 | 32 174,0 | --- | 17,4 д | 2- | β⁺→230Th(92,2%) β⁻→230U(7,8%) α→226Ac(0,003%) | 1948 |
| 232Pa | 141 | 232,0386 | 35 947,0 | --- | 1,32 д | (2-) | β⁻→232U(100%) EC→232Th | 1949 |
| 233Pa | 142 | 233,0402 | 37 489,4 | --- | 26,98 д | 3/2- | β⁻→233U(100%) | 1938 |
| 234Pa | 143 | 234,0433 | 40 339,0 | --- | 6,7 год | 4+ | β⁻→234U(100%) | 1913 |
| 234mPa | 143 | 234,0434 | 40 417,9 | --- | 1,16 хв | (0-) | β⁻→234U(~100%) γ→234Pa(0,16%) | 1951 |
| 235Pa | 144 | 235,0454 | 42 289,0 | --- | 24,4 хв | 3/2- | β⁻→235U(100%) | 1950 |
| 236Pa | 145 | 236,0487 | 45 334,0 | --- | 9,1 хв | (1-) | β⁻→236U(~100%) β⁻SF(6е-8%) | 1963 |
| 237Pa | 146 | 237,051 | 47 528,0 | --- | 8,7 хв | 1/2+ | β⁻→237U(100%) | 1954 |
| 238Pa | 147 | 238,0546 | 50 894,0 | --- | 2,28 хв | (3-) | β⁻→238U(~100%) β⁻SF(<2,6е-6%) | 1968 |
| 239Pa | 148 | 239,0573 | 53 340,0 | --- | 1,8 год | (1/2+) | β⁻→239U(100%) | 1995 |
| 240Pa | 149 | 240,0612 | 57 010,0 | --- | 20,0 с | (3+) | β⁻→240U | --- |
| 241Pa | 150 | 241,0641 | 59 740,0 | --- | 28,0 хв | (1/2+) | β⁻→241U | --- |