Am
Америцій
Z 95 243,0 г/мольАктиноїд Радіоактивний
| 223Am | 128 | 223,0458 | 42 700,0 | --- | 10,0 мс | (9/2-) | α→219Np(100%) β⁺→223Pu | 2015 |
| 224Am | 129 | 224,0464 | 43 260,0 | --- | 1,0 мс | --- | α→220Np SF | --- |
| 225Am | 130 | 225,0455 | 42 390,0 | --- | 100,0 мкс | (9/2-) | α→221Np SF | --- |
| 226Am | 131 | 226,0461 | 42 970,0 | --- | 100,0 мкс | --- | α→222Np SF | --- |
| 227Am | 132 | 227,0453 | 42 180,0 | --- | 20,0 мс | (9/2-) | α→223Np SF | --- |
| 228Am | 133 | 228,046 | 42 850,0 | --- | 100,0 мс | --- | α→224Np SF | --- |
| 229Am | 134 | 229,0453 | 42 180,0 | --- | 1,8 с | (5/2-) | α→225Np(100%) β⁺→229Pu | 2015 |
| 230Am | 135 | 230,046 | 42 870,0 | --- | 40,0 с | (1-) | β⁺→230Pu(100%) β⁺SF(>30%) | 2003 |
| 231Am | 136 | 231,0455 | 42 410,0 | --- | 1,0 хв | (5/2-) | β⁺→231Pu α→227Np | --- |
| 232Am | 137 | 232,0466 | 43 420,0 | --- | 1,31 хв | (1-) | β⁺→232Pu(96,931%) β⁺SF(0,069%) α→228Np | 1967 |
| 233Am | 138 | 233,0465 | 43 290,0 | --- | 3,2 хв | (5/2-) | α→229Np(4,5%) β⁺→233Pu | 2000 |
| 234Am | 139 | 234,0477 | 44 460,0 | --- | 2,32 хв | (0-) | β⁺→234Pu(99,993%) α→230Np(0,039%) β⁺SF(0,007%) | 1967 |
| 235Am | 140 | 235,0479 | 44 620,0 | --- | 10,3 хв | (5/2-) | β⁺→235Pu(99,6%) α→231Np(0,4%) | 1996 |
| 236Am | 141 | 236,0494 | 46 040,0 | --- | 3,6 хв | 5- | β⁺→236Pu(~100%) α→232Np(0,004%) | 1998 |
| 236mAm | 141 | 236,0495 | 46 090,0 | --- | 2,9 хв | (1-) | β⁺→236Pu(100%) α→232Np | 2004 |
| 237Am | 142 | 237,05 | 46 570,0 | --- | 1,23 год | 5/2- | β⁺→237Pu(99,975%) α→233Np(0,025%) | 1970 |
| 238Am | 143 | 238,052 | 48 420,0 | --- | 1,63 год | 1+ | β⁺→238Pu(~100%) α→234Np(1е-4%) | 1950 |
| 238mAm | 143 | 238,0547 | 50 920,0 | --- | 35,0 мкс | --- | SF(100%) γ→238Am | 1967 |
| 239Am | 144 | 239,053 | 49 390,4 | --- | 11,9 год | 5/2- | EC→239Pu(99,99%) α→235Np(0,01%) | 1949 |
| 239mAm | 144 | 239,0557 | 51 890,0 | --- | 163,0 нс | (7/2+) | SF(100%) γ→239Am | 1969 |
| 240Am | 145 | 240,0553 | 51 510,0 | --- | 2,12 д | (3-) | β⁺→240Pu(~100%) α→236Np(1,9е-4%) | 1949 |
| 240mAm | 145 | 240,0585 | 54 510,0 | --- | 940,0 мкс | --- | SF(100%) γ→240Am | 1967 |
| 241Am | 146 | 241,0568 | 52 934,3 | --- | 432,6 р | 5/2- | α→237Np(~100%) SF(3,6е-10%) | 1949 |
| 241mAm | 146 | 241,0592 | 55 130,0 | --- | 1,2 мкс | --- | SF(100%) | 1969 |
| 242Am | 147 | 242,0595 | 55 468,0 | --- | 16,02 год | 1- | β⁻→242Cm(82,7%) EC→242Pu(17,3%) | 1949 |
| 242mAm | 147 | 242,0596 | 55 516,6 | --- | 141,0 р | 5- | γ→242Am(99,55%) α→238Np(0,45%) SF(<4,7е-9%) | 1950 |
| 242nAm | 147 | 242,0619 | 57 670,0 | --- | 14,0 мс | (2-) | SF(100%) γ→242Am | 1962 |
| 243Am | 148 | 243,0614 | 57 175,0 | --- | 7,35 кр | 5/2- | α→239Np(~100%) SF(3,7е-9%) | 1950 |
| 243mAm | 148 | 243,0639 | 59 480,0 | --- | 5,5 мкс | --- | SF(100%) γ→243Am | 1970 |
| 244Am | 149 | 244,0643 | 59 879,1 | --- | 10,01 год | (6-) | β⁻→244Cm(100%) | 1950 |
| 244mAm | 149 | 244,0644 | 59 968,4 | --- | 26,13 хв | 1+ | β⁻→244Cm(99,964%) EC→244Pu(0,036%) | 1950 |
| 244nAm | 149 | 244,0664 | 61 880,0 | --- | 900,0 мкс | --- | SF(100%) γ→244Am | 1967 |
| 245Am | 150 | 245,0665 | 61 900,4 | --- | 2,05 год | 5/2+ | β⁻→245Cm(100%) | 1955 |
| 245mAm | 150 | 245,069 | 64 300,0 | --- | 640,0 нс | --- | SF(100%) γ→245Am | 1972 |
| 246Am | 151 | 246,0698 | 64 994,0 | --- | 39,0 хв | 7- | β⁻→246Cm(100%) | 1955 |
| 246mAm | 151 | 246,0698 | 65 024,0 | --- | 25,0 хв | (2-) | β⁻→246Cm(100%) γ→246Am | 1955 |
| 246nAm | 151 | 246,0719 | 66 990,0 | --- | 73,0 мкс | --- | SF(100%) γ→246Am | 1972 |
| 247Am | 152 | 247,0721 | 67 150,0 | --- | 23,0 хв | (5/2) | β⁻→247Cm(100%) | 1967 |
| 248Am | 153 | 248,0757 | 70 560,0 | --- | 3,0 хв | (3+) | β⁻→248Cm | --- |
| 249Am | 154 | 249,0785 | 73 100,0 | --- | 3,0 хв | (5/2) | β⁻→249Cm | --- |