Во природата цериумот (58Ce) е составен од 4 стабилни изотопи: 136Ce, 138Ce, 140Ce и 142Ce, при што 140Ce е најзастапен (88,48% природна застапеност) и единствениот теоретски стабилен. Се предвидува дека 136Ce, 138Ce и 142Ce ќе претрпат двоен бета-распад, но овој процес никогаш не бил забележан. Има 35 радиоизотопи со определени одлики, при што најстабилен е 144Ce, со време на полураспад од 284.893 дена, 139 Ce, со време на полураспад од 137.640 дена и 141Ce, со време на полураспад од 32.501 дена. Сите преостанати радиоактивни изотопи имаат време на полураспад помало од 4 дена, а повеќето од нив имаат време на полураспад помало од 10 минути. Овој елемент има и 10 мета-состојби.
Изотопите на цериумот се движат по атомска тежина од 119 u (119Ce) до 157 u (157Ce).
Список на изотопи
|-id=Цериум-121 | rowspan=2|121Ce | rowspan=2 style="text-align:right" | 58 | rowspan=2 style="text-align:right" | 63 | rowspan=2|120,94344(43)# | rowspan=2|1,1(1) с | β+ (99%) | 121La | rowspan=2|5/2(+#) | rowspan=2| | rowspan=2| |- | β+, p (1%) | 121La |-id=Цериум-122 | 122Ce | style="text-align:right" | 58 | style="text-align:right" | 64 | 121,93787(43)# | 2# с | β+ | 122La | 0+
|-id=Цериум-123 | rowspan=2|123Ce | rowspan=2 style="text-align:right" | 58 | rowspan=2 style="text-align:right" | 65 | rowspan=2|122,93528(32)# | rowspan=2|3,8(2) с | β+ (?%) | 123La | rowspan=2|(5/2)(+#) | rowspan=2| | rowspan=2| |- | β+, p (?%) | 122Ba |-id=Цериум-124 | 124Ce | style="text-align:right" | 58 | style="text-align:right" | 66 | 123,93031(32)# | 9,1(12) с | β+ | 124La | 0+
|-id=Цериум-125 | rowspan=2|125Ce | rowspan=2 style="text-align:right" | 58 | rowspan=2 style="text-align:right" | 67 | rowspan=2|124,92844(21)# | rowspan=2|9,7(3) с | β+ (?%) | 125La | rowspan=2|(7/2−) | rowspan=2| | rowspan=2| |- | β+, p (?%) | 124Ba |-id=Цериум-125m | style="text-indent:1em" | 125mCe | colspan="3" style="text-indent:2em" | 93,6(4) keV | 13(10) с | IT | 125Ce | (1/2+)
|-id=Цериум-126 | 126Ce | style="text-align:right" | 58 | style="text-align:right" | 68 | 125,923971(30) | 51,0(3) с | β+ | 126La | 0+
|-id=Цериум-127 | 127Ce | style="text-align:right" | 58 | style="text-align:right" | 69 | 126,922727(31) | 34(2) с | β+ | 127La | (1/2+)
|-id=Цериум-127m1 | style="text-indent:1em" | 127m1Ce | colspan="3" style="text-indent:2em" | 7,3(11) keV | 28,6(7) с | β+ | 127La | (5/2+)
|-id=Цериум-127m2 | style="text-indent:1em" | 127m2Ce | colspan="3" style="text-indent:2em" | 36,9(11) keV | >10 μs | IT | 127Ce | (7/2−)
|-id=Цериум-128 | 128Ce | style="text-align:right" | 58 | style="text-align:right" | 70 | 127,918911(30) | 3,93(2) мин | β+ | 128La | 0+
|-id=Цериум-129 | 129Ce | style="text-align:right" | 58 | style="text-align:right" | 71 | 128,918102(30) | 3,5(3) мин | β+ | 129La | (5/2+)
|-id=Цериум-130 | 130Ce | style="text-align:right" | 58 | style="text-align:right" | 72 | 129,914736(30) | 22,9(5) мин | β+ | 130La | 0+
|-id=Цериум-130m | style="text-indent:1em" | 130mCe | colspan="3" style="text-indent:2em" | 2453,6(3) keV | 100(8) нс | IT | 130Ce | 7−
|-id=Цериум-131 | 131Ce | style="text-align:right" | 58 | style="text-align:right" | 73 | 130,914429(35) | 10,3(3) мин | β+ | 131La | 7/2+
|-id=Цериум-131m | style="text-indent:1em" | 131mCe | colspan="3" style="text-indent:2em" | 63,09(9) keV | 5,4(4) мин | β+ | 131La | (1/2+)
|-id=Цериум-132 | 132Ce | style="text-align:right" | 58 | style="text-align:right" | 74 | 131,911466(22) | 3,51(11) ч | β+ | 132La | 0+
|-id=Цериум-132m | style="text-indent:1em" | 132mCe | colspan="3" style="text-indent:2em" | 2341,15(21) keV | 9,4(3) мс | IT | 132Ce | 8−
|-id=Цериум-133 | 133Ce | style="text-align:right" | 58 | style="text-align:right" | 75 | 132,911520(18) | 97(4) мин | β+ | 133La | 1/2+
|-id=Цериум-133m | style="text-indent:1em" | 133mCe | colspan="3" style="text-indent:2em" | 37,2(7) keV | 5,1(3) ч | β+ | 133La | 9/2−
|-id=Цериум-134 | 134Ce | style="text-align:right" | 58 | style="text-align:right" | 76 | 133,908928(22) | 3,16(4) д | EC | 134La | 0+
|-id=Цериум-134m | style="text-indent:1em" | 134mCe | colspan="3" style="text-indent:2em" | 3208,6(4) keV | 308(5) нс | IT | 134Ce | 10+
|-id=Цериум-135 | 135Ce | style="text-align:right" | 58 | style="text-align:right" | 77 | 134,909161(11) | 17,7(3) ч | β+ | 135La | 1/2+
|-id=Цериум-135m | style="text-indent:1em" | 135mCe | colspan="3" style="text-indent:2em" | 445,81(21) keV | 20(1) с | IT | 135Ce | (11/2−)
|-id=Цериум-136 | 136Ce | style="text-align:right" | 58 | style="text-align:right" | 78 | 135,90712926(35) | colspan=3 align=center|Опсервациски стабиленТеоретски подлежи на β+β+ распад до 136Ba со време на полуживот преку 3,2×1016 години | 0+ | 0,00186(2) | |-id=Цериум-136m | style="text-indent:1em" | 136mCe | colspan="3" style="text-indent:2em" | 3095,0(6) keV | 1,96(9) μs | IT | 136Ce | 10+
|-id=Цериум-137 | 137Ce | style="text-align:right" | 58 | style="text-align:right" | 79 | 136,90776242(39) | 9,0(3) ч | β+ | 137La | 3/2+
|-id=Цериум-137m | rowspan=2 style="text-indent:1em" | 137mCe | rowspan=2 colspan="3" style="text-indent:2em" | 254,29(5) keV | rowspan=2|34,4(3) ч | IT (99,21%) | 137Ce | rowspan=2|11/2− | rowspan=2| | rowspan=2| |- | β+ (0,79%) | 137La |-id=Цериум-138 | 138Ce | style="text-align:right" | 58 | style="text-align:right" | 80 | 137,90599418(54) | colspan=3 align=center|Опсервациски стабиленТеоретски подлежи на β+β+ распад до 138Ba со време на полуживот преку 4,4×1016 години | 0+ | 0,00251(2) | |-id=Цериум-138m | style="text-indent:1em" | 138mCe | colspan="3" style="text-indent:2em" | 2129,28(12) keV | 8,73(20) мс | IT | 138Ce | 7-
|-id=Цериум-139 | 139Ce | style="text-align:right" | 58 | style="text-align:right" | 81 | 138,9066470(22) | 137,642(20) д | EC | 139La | 3/2+
|-id=Цериум-139m | style="text-indent:1em" | 139mCe | colspan="3" style="text-indent:2em" | 754,24(8) keV | 57,58(32) с | IT | 139Ce | 11/2−
|-id=Цериум-140 | 140CeФисионен производ | style="text-align:right" | 58 | style="text-align:right" | 82 | 139,9054484(14) | colspan=3 align=center|Стабилен | 0+ | 0,88449(51) | |-id=Цериум-140m | style="text-indent:1em" | 140mCe | colspan="3" style="text-indent:2em" | 2107,854(24) keV | 7,3(15) μs | IT | 140Ce | 6+
|-id=Цериум-141 | 141Ce | style="text-align:right" | 58 | style="text-align:right" | 83 | 140,9082860(14) | 32,505(10) д | β− | 141Pr | 7/2−
|-id=Цериум-142 | 142Ce | style="text-align:right" | 58 | style="text-align:right" | 84 | 141,9092502(26) | colspan=3 align=center|Опсервациски стабиленТеоретски подлежи на β−β− распад до 142Nd или α распад до 138Ba со време на полураспад од 2,9×1018 години | 0+ | 0,11114(51) | |-id=Цериум-143 | 143Ce | style="text-align:right" | 58 | style="text-align:right" | 85 | 142,9123920(26) | 33,039(6) ч | β− | 143Pr | 3/2−
|-id=Цериум-144 | 144Ce | style="text-align:right" | 58 | style="text-align:right" | 86 | 143,9136528(30) | 284,886(25) д | β− | 144Pr | 0+
|-id=Цериум-145 | 145Ce | style="text-align:right" | 58 | style="text-align:right" | 87 | 144,917265(36) | 3,01(6) мин | β− | 145Pr | 5/2−#
|-id=Цериум-146 | 146Ce | style="text-align:right" | 58 | style="text-align:right" | 88 | 145,918812(16) | 13,49(16) мин | β− | 146Pr | 0+
|-id=Цериум-147 | 147Ce | style="text-align:right" | 58 | style="text-align:right" | 89 | 146,9226899(92) | 56,4(10) с | β− | 147Pr | (5/2−)
|-id=Цериум-148 | 148Ce | style="text-align:right" | 58 | style="text-align:right" | 90 | 147,924424(12) | 56,8(3) с | β− | 148Pr | 0+
|-id=Цериум-149 | 149Ce | style="text-align:right" | 58 | style="text-align:right" | 91 | 148,928427(11) | 4,94(4) с | β− | 149Pr | 3/2−#
|-id=Цериум-150 | 150Ce | style="text-align:right" | 58 | style="text-align:right" | 92 | 149,930384(13) | 6,05(7) с | β− | 150Pr | 0+
|-id=Цериум-151 | 151Ce | style="text-align:right" | 58 | style="text-align:right" | 93 | 150,934272(19) | 1,76(6) с | β− | 151Pr | (3/2−)
|-id=Цериум-152 | 152Ce | style="text-align:right" | 58 | style="text-align:right" | 94 | 151,93668(22)# | 1,42(2) с | β− | 152Pr | 0+
|-id=Цериум-153 | 153Ce | style="text-align:right" | 58 | style="text-align:right" | 95 | 152,94105(22)# | 865(25) мс | β− | 153Pr | 3/2−#
|-id=Цериум-154 | 154Ce | style="text-align:right" | 58 | style="text-align:right" | 96 | 153,94394(22)# | 722(14) мс | β− | 154Pr | 0+
|-id=Цериум-155 | 155Ce | style="text-align:right" | 58 | style="text-align:right" | 97 | 154,94871(32)# | 313(7) мс | β− | 155Pr | 5/2−#
|-id=Цериум-156 | 156Ce | style="text-align:right" | 58 | style="text-align:right" | 98 | 155,95188(32)# | 233(9) мс | β− | 156Pr | 0+
|-id=Цериум-157 | 157Ce | style="text-align:right" | 58 | style="text-align:right" | 99 | 156,95713(43)# | 175(41) мс | β− | 157Pr | 7/2+#
|-id=Цериум-158 | 158Ce | style="text-align:right" | 58 | style="text-align:right" | 100 | 157,96077(43)# | 99(93) мс | β− | 158Pr | 0+
Наводи
Isotope masses from:
Isotopic compositions and standard atomic masses from:
Half-life, spin, and isomer data selected from the following sources.
Цериум Категорија:Цериум Категорија:Изотопи на цериумот