Isotopes of cerium

Naturally occurring cerium (₅₈Ce) is composed of 4 stable isotopes: ¹³⁶Ce, ¹³⁸Ce, ¹⁴⁰Ce, and ¹⁴²Ce, with ¹⁴⁰Ce being the most abundant (88.45% natural abundance) and the only one that is theoretically stable. The others, ¹³⁶Ce, ¹³⁸Ce, and ¹⁴²Ce are predicted to undergo double beta decay, which has never been observed. There are 35 radioisotopes that have been characterized, with the most stable being ¹⁴⁴Ce, with a half-life of 284.89 days; ¹³⁹Ce, with a half-life of 137.64 days and ¹⁴¹Ce, with a half-life of 32.505 days. All of the remaining radioactive isotopes have half-lives that are less than 4 days and the majority of these have half-lives that are less than 10 minutes.

The known isotopes of cerium range from ¹²¹Ce to ¹⁵⁷Ce, in addition to 14 meta states.

List of isotopes

|-id=Cerium-119 | ¹¹⁹Ce | style="text-align:right" | 58 | style="text-align:right" | 61 | 118.95296(54)# | 200#&nbsp;ms<br>[>310&nbsp;ns] | | | 5/2+# | | |-id=Cerium-120 | ¹²⁰Ce | style="text-align:right" | 58 | style="text-align:right" | 62 | 119.94661(54)# | 250#&nbsp;ms<br>[>310&nbsp;ns] | | | 0+ | | |-id=Cerium-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)&nbsp;s | β⁺ (99%) | ¹²¹La | rowspan=2|5/2(+#) | rowspan=2| | rowspan=2| |- | β⁺, p (1%) | ¹²⁰Ba |-id=Cerium-122 | ¹²²Ce | style="text-align:right" | 58 | style="text-align:right" | 64 | 121.93787(43)# | 2#&nbsp;s | β⁺ | ¹²²La | 0+ | | |-id=Cerium-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)&nbsp;s | β⁺ (?%) | ¹²³La | rowspan=2|(5/2)(+#) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹²²Ba |-id=Cerium-124 | ¹²⁴Ce | style="text-align:right" | 58 | style="text-align:right" | 66 | 123.93031(32)# | 9.1(12)&nbsp;s | β⁺ | ¹²⁴La | 0+ | | |-id=Cerium-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)&nbsp;s | β⁺ (?%) | ¹²⁵La | rowspan=2|(7/2−) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹²⁴Ba |-id=Cerium-125m | style="text-indent:1em" | ^125mCe | colspan="3" style="text-indent:2em" | 93.6(4)&nbsp;keV | 13(10)&nbsp;s | IT | ¹²⁵Ce | (1/2+) | | |-id=Cerium-126 | ¹²⁶Ce | style="text-align:right" | 58 | style="text-align:right" | 68 | 125.923971(30) | 51.0(3)&nbsp;s | β⁺ | ¹²⁶La | 0+ | | |-id=Cerium-127 | ¹²⁷Ce | style="text-align:right" | 58 | style="text-align:right" | 69 | 126.922727(31) | 34(2)&nbsp;s | β⁺ | ¹²⁷La | (1/2+) | | |-id=Cerium-127m1 | style="text-indent:1em" | ^127m1Ce | colspan="3" style="text-indent:2em" | 7.3(11)&nbsp;keV | 28.6(7)&nbsp;s | β⁺ | ¹²⁷La | (5/2+) | | |-id=Cerium-127m2 | style="text-indent:1em" | ^127m2Ce | colspan="3" style="text-indent:2em" | 36.9(11)&nbsp;keV | >10&nbsp;μs | IT | ¹²⁷Ce | (7/2−) | | |-id=Cerium-128 | ¹²⁸Ce | style="text-align:right" | 58 | style="text-align:right" | 70 | 127.918911(30) | 3.93(2)&nbsp;min | β⁺ | ¹²⁸La | 0+ | | |-id=Cerium-129 | ¹²⁹Ce | style="text-align:right" | 58 | style="text-align:right" | 71 | 128.918102(30) | 3.5(3)&nbsp;min | β⁺ | ¹²⁹La | (5/2+) | | |-id=Cerium-130 | ¹³⁰Ce | style="text-align:right" | 58 | style="text-align:right" | 72 | 129.914736(30) | 22.9(5)&nbsp;min | β⁺ | ¹³⁰La | 0+ | | |-id=Cerium-130m | style="text-indent:1em" | ^130mCe | colspan="3" style="text-indent:2em" | 2453.6(3)&nbsp;keV | 100(8)&nbsp;ns | IT | ¹³⁰Ce | 7− | | |-id=Cerium-131 | ¹³¹Ce | style="text-align:right" | 58 | style="text-align:right" | 73 | 130.914429(35) | 10.3(3)&nbsp;min | β⁺ | ¹³¹La | 7/2+ | | |-id=Cerium-131m | style="text-indent:1em" | ^131mCe | colspan="3" style="text-indent:2em" | 63.09(9)&nbsp;keV | 5.4(4)&nbsp;min | β⁺ | ¹³¹La | (1/2+) | | |-id=Cerium-132 | ¹³²Ce | style="text-align:right" | 58 | style="text-align:right" | 74 | 131.911466(22) | 3.51(11)&nbsp;h | β⁺ | ¹³²La | 0+ | | |-id=Cerium-132m | style="text-indent:1em" | ^132mCe | colspan="3" style="text-indent:2em" | 2341.15(21)&nbsp;keV | 9.4(3)&nbsp;ms | IT | ¹³²Ce | 8− | | |-id=Cerium-133 | ¹³³Ce | style="text-align:right" | 58 | style="text-align:right" | 75 | 132.911520(18) | 97(4)&nbsp;min | β⁺ | ¹³³La | 1/2+ | | |-id=Cerium-133m | style="text-indent:1em" | ^133mCe | colspan="3" style="text-indent:2em" | 37.2(7)&nbsp;keV | 5.1(3)&nbsp;h | β⁺ | ¹³³La | 9/2− | | |-id=Cerium-134 | ¹³⁴Ce | style="text-align:right" | 58 | style="text-align:right" | 76 | 133.908928(22) | 3.16(4)&nbsp;d | EC | ¹³⁴La | 0+ | | |-id=Cerium-134m | style="text-indent:1em" | ^134mCe | colspan="3" style="text-indent:2em" | 3208.6(4)&nbsp;keV | 308(5)&nbsp;ns | IT | ¹³⁴Ce | 10+ | | |-id=Cerium-135 | ¹³⁵Ce | style="text-align:right" | 58 | style="text-align:right" | 77 | 134.909161(11) | 17.7(3)&nbsp;h | β⁺ | ¹³⁵La | 1/2+ | | |-id=Cerium-135m | style="text-indent:1em" | ^135mCe | colspan="3" style="text-indent:2em" | 445.81(21)&nbsp;keV | 20(1)&nbsp;s | IT | ¹³⁵Ce | (11/2−) | | |-id=Cerium-136 | ¹³⁶Ce | style="text-align:right" | 58 | style="text-align:right" | 78 | 135.90712926(35) | colspan=3 align=center|Observationally stable | 0+ | 0.00186(2) | |-id=Cerium-136m | style="text-indent:1em" | ^136mCe | colspan="3" style="text-indent:2em" | 3095.0(6)&nbsp;keV | 1.96(9)&nbsp;μs | IT | ¹³⁶Ce | 10+ | | |-id=Cerium-137 | ¹³⁷Ce | style="text-align:right" | 58 | style="text-align:right" | 79 | 136.90776242(39) | 9.0(3)&nbsp;h | β⁺ | ¹³⁷La | 3/2+ | | |-id=Cerium-137m | rowspan=2 style="text-indent:1em" | ^137mCe | rowspan=2 colspan="3" style="text-indent:2em" | 254.29(5)&nbsp;keV | rowspan=2|34.4(3)&nbsp;h | IT (99.21%) | ¹³⁷Ce | rowspan=2|11/2− | rowspan=2| | rowspan=2| |- | β⁺ (0.79%) | ¹³⁷La |-id=Cerium-138 | ¹³⁸Ce | style="text-align:right" | 58 | style="text-align:right" | 80 | 137.90599418(54) | colspan=3 align=center|Observationally stable | 0+ | 0.00251(2) | |-id=Cerium-138m | style="text-indent:1em" | ^138mCe | colspan="3" style="text-indent:2em" | 2129.28(12)&nbsp;keV | 8.73(20)&nbsp;ms | IT | ¹³⁸Ce | 7- | | |-id=Cerium-139 | ¹³⁹Ce | style="text-align:right" | 58 | style="text-align:right" | 81 | 138.9066470(22) | 137.642(20)&nbsp;d | EC | ¹³⁹La | 3/2+ | | |-id=Cerium-139m | style="text-indent:1em" | ^139mCe | colspan="3" style="text-indent:2em" | 754.24(8)&nbsp;keV | 57.58(32)&nbsp;s | IT | ¹³⁹Ce | 11/2− | | |-id=Cerium-140 | ¹⁴⁰Ce | style="text-align:right" | 58 | style="text-align:right" | 82 | 139.9054484(14) | colspan=3 align=center|Stable | 0+ | 0.88449(51) | |-id=Cerium-140m | style="text-indent:1em" | ^140mCe | colspan="3" style="text-indent:2em" | 2107.854(24)&nbsp;keV | 7.3(15)&nbsp;μs | IT | ¹⁴⁰Ce | 6+ | | |-id=Cerium-141 | ¹⁴¹Ce | style="text-align:right" | 58 | style="text-align:right" | 83 | 140.9082860(14) | 32.505(10)&nbsp;d | β^− | ¹⁴¹Pr | 7/2− | | |-id=Cerium-142 | ¹⁴²Ce | style="text-align:right" | 58 | style="text-align:right" | 84 | 141.9092502(26) | colspan=3 align=center|Observationally stable | 0+ | 0.11114(51) | |-id=Cerium-143 | ¹⁴³Ce | style="text-align:right" | 58 | style="text-align:right" | 85 | 142.9123920(26) | 33.039(6)&nbsp;h | β^− | ¹⁴³Pr | 3/2− | | |-id=Cerium-144 | ¹⁴⁴Ce | style="text-align:right" | 58 | style="text-align:right" | 86 | 143.9136528(30) | 284.886(25)&nbsp;d | β^− | ¹⁴⁴Pr | 0+ | | |-id=Cerium-145 | ¹⁴⁵Ce | style="text-align:right" | 58 | style="text-align:right" | 87 | 144.917265(36) | 3.01(6)&nbsp;min | β^− | ¹⁴⁵Pr | 5/2−# | | |-id=Cerium-146 | ¹⁴⁶Ce | style="text-align:right" | 58 | style="text-align:right" | 88 | 145.918812(16) | 13.49(16)&nbsp;min | β^− | ¹⁴⁶Pr | 0+ | | |-id=Cerium-147 | ¹⁴⁷Ce | style="text-align:right" | 58 | style="text-align:right" | 89 | 146.9226899(92) | 56.4(10)&nbsp;s | β^− | ¹⁴⁷Pr | (5/2−) | | |-id=Cerium-148 | ¹⁴⁸Ce | style="text-align:right" | 58 | style="text-align:right" | 90 | 147.924424(12) | 56.8(3)&nbsp;s | β^− | ¹⁴⁸Pr | 0+ | | |-id=Cerium-149 | ¹⁴⁹Ce | style="text-align:right" | 58 | style="text-align:right" | 91 | 148.928427(11) | 4.94(4)&nbsp;s | β^− | ¹⁴⁹Pr | 3/2−# | | |-id=Cerium-150 | ¹⁵⁰Ce | style="text-align:right" | 58 | style="text-align:right" | 92 | 149.930384(13) | 6.05(7)&nbsp;s | β^− | ¹⁵⁰Pr | 0+ | | |-id=Cerium-151 | ¹⁵¹Ce | style="text-align:right" | 58 | style="text-align:right" | 93 | 150.934272(19) | 1.76(6)&nbsp;s | β^− | ¹⁵¹Pr | (3/2−) | | |-id=Cerium-152 | ¹⁵²Ce | style="text-align:right" | 58 | style="text-align:right" | 94 | 151.93668(22)# | 1.42(2)&nbsp;s | β^− | ¹⁵²Pr | 0+ | | |-id=Cerium-153 | ¹⁵³Ce | style="text-align:right" | 58 | style="text-align:right" | 95 | 152.94105(22)# | 865(25)&nbsp;ms | β^− | ¹⁵³Pr | 3/2−# | | |-id=Cerium-154 | ¹⁵⁴Ce | style="text-align:right" | 58 | style="text-align:right" | 96 | 153.94394(22)# | 722(14)&nbsp;ms | β^− | ¹⁵⁴Pr | 0+ | | |-id=Cerium-155 | ¹⁵⁵Ce | style="text-align:right" | 58 | style="text-align:right" | 97 | 154.94871(32)# | 313(7)&nbsp;ms | β^− | ¹⁵⁵Pr | 5/2−# | | |-id=Cerium-156 | ¹⁵⁶Ce | style="text-align:right" | 58 | style="text-align:right" | 98 | 155.95188(32)# | 233(9)&nbsp;ms | β^− | ¹⁵⁶Pr | 0+ | | |-id=Cerium-157 | ¹⁵⁷Ce | style="text-align:right" | 58 | style="text-align:right" | 99 | 156.95713(43)# | 175(41)&nbsp;ms | β^− | ¹⁵⁷Pr | 7/2+# | | |-id=Cerium-158 | ¹⁵⁸Ce | style="text-align:right" | 58 | style="text-align:right" | 100 | 157.96077(43)# | 99(93)&nbsp;ms | β^− | ¹⁵⁸Pr | 0+ | | |-id=Cerium-159 | ¹⁵⁹Ce | style="text-align:right" | 58 | style="text-align:right" | 101 | 158.96636(54)# | | | | 1/2−# | | |-id=Cerium-160 | ¹⁶⁰Ce | style="text-align:right" | 58 | style="text-align:right" | 102 | | | | | 0+ | |

See also

Daughter products other than cerium

• Isotopes of praseodymium
• Isotopes of lanthanum
• Isotopes of barium

References