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Isotopes of Cerium

List, data and properties of all known isotopes of Cerium.

Content
Atomic properties
Decay properties
NMR active nuclides
Radiation protection
References
Cerium isotopes

All atomic nuclei of the chemical element cerium are summarized under cerium isotopes; these all consist of an atomic nucleus with 58 protons and, in the uncharged state, 58 electrons. The difference between each cerium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Cerium Isotopes

Cerium is a chemical element from the group of rare earth metals (rare earths). The 4 stable isotopes cerium-136, cerium-138, cerium-140 and cerium-142 occur in nature:

Atomic Mass maQuantityHalf-lifeSpin
Cerium
Isotopic mixture		140,116 u100 %
Isotope 136Ce135,907129(3) u0,186(2) %stable0+
Isotope 138Ce137,90599(7) u0,251(2) %stable0+
Isotope 140Ce139,90544(2) u88,449(51) %stable0+
Isotope 142Ce141,90925(2) u11,114(51) %stable0+

 

All other cerium nuclides are unstable and decay, emitting radioactive radiation.

 

Isotope Table: Cerium

The two following tables list the most important data and properties of the Cerium isotopes. Further information on the individual Cerium isotopes is listed on separate pages and can be accessed via the link in column 1.

 

Atomic Properties

Isotope
Nuclide		ENAtomic Mass
[Nuclear Mass]
{Mass Excess}		Spin I
(h/2π)		Parent
123456
Cerium-11911958Ce61118.95276(64) u
[118.9209446 u]
{-44.00378 MeV}		5/2+
Cerium-12012058Ce62119.94664(75) u
[119.9148246 u]
{-49.70452 MeV}		0+
Cerium-12112158Ce63120.94343(43) u
[120.9116146 u]
{-52.69462 MeV}		(5/2)121Pr
Cerium-12212258Ce64121.93787(43) u
[121.9060546 u]
{-57.87372 MeV}		0+122Pr
Cerium-12312358Ce65122.93528(32) u
[122.9034646 u]
{-60.28629 MeV}		(5/2)123Pr
Cerium-12412458Ce66123.93031(32) u
[123.8984946 u]
{-64.91582 MeV}		0+124Pr
Cerium-12512558Ce67124.92844(21) u
[124.8966246 u]
{-66.65771 MeV}		(7/2-)125Pr
Cerium-12612658Ce68125.92397(3) u
[125.8921546 u]
{-70.82149 MeV}		0+126Pr
Cerium-12712758Ce69126.92273(3) u
[126.8909146 u]
{-71.97654 MeV}		1/2+127Pr
Cerium-127m127m58Ce69126.92273(3) u
[126.8909146 u]
{-71.97654 MeV}		(5/2+)
Cerium-12812858Ce70127.91891(3) u
[127.8870946 u]
{-75.53485 MeV}		0+128Pr
Cerium-12912958Ce71128.91810(3) u
[128.8862846 u]
{-76.28936 MeV}		(5/2+)129Pr
Cerium-13013058Ce72129.91474(3) u
[129.8829246 u]
{-79.41918 MeV}		0+130Pr
Cerium-130m130m58Ce72129.91474(3) u
[129.8829246 u]
{-79.41918 MeV}		(7-)
Cerium-13113158Ce73130.91443(4) u
[130.8826146 u]
{-79.70794 MeV}		7/2+131Pr
Cerium-131m131m58Ce73130.91443(4) u
[130.8826146 u]
{-79.70794 MeV}		(1/2+)
Cerium-13213258Ce74131.911464(22) u
[131.8796486 u]
{-82.47075 MeV}		0+132Pr
Cerium-132m132m58Ce74131.911464(22) u
[131.8796486 u]
{-82.47075 MeV}		(8-)
Cerium-13313358Ce75132.911520(18) u
[132.8797046 u]
{-82.41859 MeV}		1/2+133Pr
Cerium-133m133m58Ce75132.911520(18) u
[132.8797046 u]
{-82.41859 MeV}		9/2-
Cerium-13413458Ce76133.908928(22) u
[133.8771126 u]
{-84.83302 MeV}		0+134Pr
Cerium-13513558Ce77134.909161(11) u
[134.8773456 u]
{-84.61598 MeV}		1/2(+)135Pr
Cerium-135m135m58Ce77134.909161(11) u
[134.8773456 u]
{-84.61598 MeV}		(11/2-)
Cerium-13613658Ce78135.907129(3) u
[135.8753136 u]
{-86.50878 MeV}		0+136Pr
Cerium-136m136m58Ce78135.907129(3) u
[135.8753136 u]
{-86.50878 MeV}		10+
Cerium-13713758Ce79136.9077626(5) u
[136.8759472 u]
{-85.91858 MeV}		3/2+137Pr
Cerium-137m137m58Ce79136.9077626(5) u
[136.8759472 u]
{-85.91858 MeV}		11/2-
Cerium-13813858Ce80137.90599(7) u
[137.8741746 u]
{-87.56975 MeV}		0+138Pr
138La
Cerium-138m138m58Ce80137.90599(7) u
[137.8741746 u]
{-87.56975 MeV}		7-
Cerium-13913958Ce81138.906658(8) u
[138.8748426 u]
{-86.94751 MeV}		3/2+139Pr
Cerium-139m139m58Ce81138.906658(8) u
[138.8748426 u]
{-86.94751 MeV}		11/2-
Cerium-14014058Ce82139.90544(2) u
[139.8736246 u]
{-88.08207 MeV}		0+140Pr
140La
144Nd
Cerium-140m140m58Ce82139.90544(2) u
[139.8736246 u]
{-88.08207 MeV}		6+
Cerium-14114158Ce83140.9082840(17) u
[140.8764686 u]
{-85.4329 MeV}		7/2-141La
Cerium-14214258Ce84141.90925(2) u
[141.8774346 u]
{-84.53308 MeV}		0+142La
142Pr
Cerium-14314358Ce85142.9123916(27) u
[142.8805762 u]
{-81.6067 MeV}		3/2-143La
Cerium-14414458Ce86143.913653(3) u
[143.8818376 u]
{-80.43171 MeV}		0+144La
Cerium-14514558Ce87144.91727(4) u
[144.8854546 u]
{-77.0625 MeV}		(5/2-)145La
Cerium-14614658Ce88145.918802(18) u
[145.8869866 u]
{-75.63545 MeV}		0+146La
Cerium-14714758Ce89146.922690(9) u
[146.8908746 u]
{-72.0138 MeV}		(5/2-)147La
Cerium-14814858Ce90147.924424(12) u
[147.8926086 u]
{-70.39859 MeV}		0+148La
Cerium-14914958Ce91148.928427(11) u
[148.8966116 u]
{-66.66982 MeV}		(3/2-)149La
Cerium-15015058Ce92149.930384(13) u
[149.8985686 u]
{-64.84689 MeV}		0+150La
Cerium-15115158Ce93150.934272(19) u
[150.9024566 u]
{-61.22524 MeV}		(5/2+)151La
Cerium-15215258Ce94151.93668(21) u
[151.9048646 u]
{-58.9822 MeV}		0+152La
Cerium-15315358Ce95152.94105(21) u
[152.9092346 u]
{-54.91157 MeV}		(3/2-)153La
Cerium-15415458Ce96153.94394(21) u
[153.9121246 u]
{-52.21955 MeV}		0+154La
Cerium-15515558Ce97154.94871(32) u
[154.9168946 u]
{-47.77633 MeV}		(5/2-)155La
Cerium-15615658Ce98155.95188(32) u
[155.9200646 u]
{-44.82349 MeV}		0+
Cerium-15715758Ce99156.95713(43) u
[156.9253146 u]
{-39.93315 MeV}		(7/2+)

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Ce-119200 msβ+ → 119LaAL
Ce-120250 msβ+ → 120LaAL
Ce-1211.1(1) sEC, β+ → 121La
EC, p → 120Ba		> 99 %
< 1 %		9.5 (5) MeV
AL
Ce-1222 sEC, p → 121Ba
EC, β+ → 122La		?
?		6.67(50) MeV
AL
Ce-1233.8(2) sEC, β+ → 123La
EC, p → 122Ba		ca. 100 %
> 0 %		8.36(26) MeV
AL
Ce-1246(2) sEC/β+ → 124La100 %5.34(30) MeVAL
Ce-1259.7(3) sEC/β+ → 125La
β+, p → 124Ba		< 100 %
?		7.10(20) MeV
AL
Ce-12651.0(3) sEC/β+ → 126La100 %4.15(9) MeVAL
Ce-12734(2) sEC/β+ → 127La100 %5.92(4) MeVAL
Ce-127m128.6(7) sEC/β+ → 127La100 %
Ce-1283.93(2) minEC/β+ → 128La100 %3.09(6) MeVAL
Ce-1293.5(3) minEC/β+ → 129La100 %5.04(4) MeVAL
Ce-13022.9(5) minEC/β+ → 130La100 %2.20(4) MeVAL
Ce-130m100(8) nsAL
Ce-13110.3(3) minEC/β+ → 131La
β+ p → 130Ba		100 %
11(3) %		4.06(4)
AL
Ce-131m5.4(4) minβ+ → 131La
Iso → 131Ce		100 %
?
AL
Ce-1323.51(11) hEC/β+ → 132La100 %1.25(4) MeVAL
Ce-132m9.4(3) msIso → 132Ce100 %2.340 MeVAL
Ce-13397(4) minEC/β+ → 133La100 %2.9 MeVAL
Ce-133m5.1(3) hEC/β+ → 133La
Iso → 133Ce		< 100 %
?
AL
Ce-1343.16(4) dEC → 134La0.386(29) MeVAL
Ce-13517.7(3) hEC/β+ → 135La100 %2.027(14) MeVAL
Ce-135m20(1) sIso → 135Ce100 %0.446 MeVAL
Ce-136stable2 β+ → 136Batheoret.AL
Ce-136m1.9(1) μsIso → 136Ce100 %AL
Ce-1379.0(3) hEC/β+ → 137La100 %1.2221(17) MeVAL
Ce-137m34.4(3) hIso → 137Ce
EC/β+ → 137La		99.21(4) %
0.79(4) %		0.254 MeV
AL
Ce-138stable2 β+ → 138Ba?AL
Ce-138m8.73(20) msIso → 138Ce100 %AL
Ce-139137.63(3) dEC → 139La100 %0.278(7) MeVAL
Ce-139m57.58(32) sIso → 139Ce100 %AL
Ce-140stableAL
Ce-140m7.3(15) μsAL
Ce-14132.511(13) dβ- → 141Pr100 %0.5827(12) MeVAL
Ce-142stable2 β- → 142NdAL
Ce-14333.039(6) hβ- → 143Pr100 %1.4616(19) MeVAL
Ce-144284.91(5) dβ- → 144Pr100 %0.3186(8) MeVAL
Ce-1453.01(6) minβ- → 145Pr100 %2.56(3) MeVAL
Ce-14613.49(16) minβ- → 146Pr100 %1.05(3) MeVAL
Ce-14756.4(10) sβ- → 147Pr100 %3.430(16) MeVAL
Ce-14856.8(3) sβ- → 148Pr100 %2.137(13) MeVAL
Ce-1495.3(2) sβ- → 149Pr100 %4.369(14) MeVAL
Ce-1504.0(6) sβ- → 150Pr100 %3.454(14) MeVAL
Ce-1511.76(6) sβ- → 151Pr100 %5.555(21) MeVAL
Ce-1521.4(2) sβ- → 152Pr100 %4.78(20) MeVAL
Ce-153865(25) msβ- → 153Pr
β-, n → 		ca. 100 %
?		6.66(20) MeV
0.78(20) MeV		AL
Ce-154722(14) msβ- → 154Pr
β-, n → 		100 %
?		5.88(23) MeV
1.28(20) MeV		AL
Ce-155313(7) msβ- → 155Pr
β-, n → 		100 %
?		7.63(30) MeV
2.25(32) MeV		AL
Ce-156233(9) msβ- → 156Pr
β-, n → 		100 %
?		6.75(36) MeV
2.52(30) MeV		AL
Ce-15718(4) msβ- → 157Pr
β-, n → 		100 %
?		8.61(50) MeV
3.57(45) MeV		AL

 

Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Cerium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.

7 - isotope notation in short form.
8 - decay: half-live of the Cerium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Cerium nuclides

Nuclide
quantity 1)
spin		Nuclear
magnetic
moment
μ/μN		Gyromagnetic ratio
{Quadrupole moment}		Resonant
frequency
v0 bei 1 T		Relative
sensitivity
H0 = const.
v0 = const. 3)
137Ce

3/2+		0,96(4)
{}		4,880,00752
0,5729
139Ce

3/2+		1,06(4)
{0,02906}		5,390,01012
0,6326
141Ce

7/2-		1,09(4)
{}		2,370,00364
1,1709

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

3) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Cerium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Ce-134107 Bq1000 Bq/g75.8 h
Ce-135106 Bq10 Bq/g17.7 h
Ce-137107 Bq1000 Bq/g9.0 h
Ce-137m+106 Bq1000 Bq/g34.4 h
Ce-139106 Bq1 Bq/g10 Bq cm-2137.6 d
Ce-141107 Bq100 Bq/g10 Bq cm-232.5 d
Ce-143106 Bq10 Bq/g10 Bq cm-233.0 h
Ce-144+105 Bq10 Bq/g100 Bq cm-2Pr-144, Pr-144m285.0 d

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Cerium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Cerium: NMR properties - 137Ce-NMR, 139Ce-NMR, 141Ce-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

 

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