About   |   More   |   Search

Isotopes of Cerium

List, data and properties of all known isotopes of Cerium as well as radioactive decay products and intermediate products.

 

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

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
119Ce5811961Cerium-119118.95276(64) u
[118.9209446 u]
{-44.00378 MeV}
5/2+
120Ce5812062Cerium-120119.94664(75) u
[119.9148246 u]
{-49.70452 MeV}
0+
121Ce5812163Cerium-121120.94343(43) u
[120.9116146 u]
{-52.69462 MeV}
(5/2)121Pr
122Ce5812264Cerium-122121.93787(43) u
[121.9060546 u]
{-57.87372 MeV}
0+122Pr
123Ce5812365Cerium-123122.93528(32) u
[122.9034646 u]
{-60.28629 MeV}
(5/2)123Pr
124Ce5812466Cerium-124123.93031(32) u
[123.8984946 u]
{-64.91582 MeV}
0+124Pr
125Ce5812567Cerium-125124.92844(21) u
[124.8966246 u]
{-66.65771 MeV}
(7/2-)125Pr
126Ce5812668Cerium-126125.92397(3) u
[125.8921546 u]
{-70.82149 MeV}
0+126Pr
127Ce5812769Cerium-127126.92273(3) u
[126.8909146 u]
{-71.97654 MeV}
1/2+127Pr
127mCe5812769Cerium-127m126.92273(3) u
[126.8909146 u]
{-71.97654 MeV}
(5/2+)
128Ce5812870Cerium-128127.91891(3) u
[127.8870946 u]
{-75.53485 MeV}
0+128Pr
129Ce5812971Cerium-129128.91810(3) u
[128.8862846 u]
{-76.28936 MeV}
(5/2+)129Pr
130Ce5813072Cerium-130129.91474(3) u
[129.8829246 u]
{-79.41918 MeV}
0+130Pr
130mCe5813072Cerium-130m129.91474(3) u
[129.8829246 u]
{-79.41918 MeV}
(7-)
131Ce5813173Cerium-131130.91443(4) u
[130.8826146 u]
{-79.70794 MeV}
7/2+131Pr
131mCe5813173Cerium-131m130.91443(4) u
[130.8826146 u]
{-79.70794 MeV}
(1/2+)
132Ce5813274Cerium-132131.911464(22) u
[131.8796486 u]
{-82.47075 MeV}
0+132Pr
132mCe5813274Cerium-132m131.911464(22) u
[131.8796486 u]
{-82.47075 MeV}
(8-)
133Ce5813375Cerium-133132.911520(18) u
[132.8797046 u]
{-82.41859 MeV}
1/2+133Pr
133mCe5813375Cerium-133m132.911520(18) u
[132.8797046 u]
{-82.41859 MeV}
9/2-
134Ce5813476Cerium-134133.908928(22) u
[133.8771126 u]
{-84.83302 MeV}
0+134Pr
135Ce5813577Cerium-135134.909161(11) u
[134.8773456 u]
{-84.61598 MeV}
1/2(+)135Pr
135mCe5813577Cerium-135m134.909161(11) u
[134.8773456 u]
{-84.61598 MeV}
(11/2-)
136Ce5813678Cerium-136135.907129(3) u
[135.8753136 u]
{-86.50878 MeV}
0+136Pr
136mCe5813678Cerium-136m135.907129(3) u
[135.8753136 u]
{-86.50878 MeV}
10+-1.80(2)
137Ce5813779Cerium-137136.9077626(5) u
[136.8759472 u]
{-85.91858 MeV}
3/2+0.96(4)137Pr
137mCe5813779Cerium-137m136.9077626(5) u
[136.8759472 u]
{-85.91858 MeV}
11/2-1.01(4)
138Ce5813880Cerium-138137.90599(7) u
[137.8741746 u]
{-87.56975 MeV}
0+138Pr
138La
138mCe5813880Cerium-138m137.90599(7) u
[137.8741746 u]
{-87.56975 MeV}
7-
139Ce5813981Cerium-139138.906658(8) u
[138.8748426 u]
{-86.94751 MeV}
3/2+1.06(4)139Pr
139mCe5813981Cerium-139m138.906658(8) u
[138.8748426 u]
{-86.94751 MeV}
11/2-
140Ce5814082Cerium-140139.90544(2) u
[139.8736246 u]
{-88.08207 MeV}
0+140Pr
140La
144Nd
140mCe5814082Cerium-140m139.90544(2) u
[139.8736246 u]
{-88.08207 MeV}
6+
141Ce5814183Cerium-141140.9082840(17) u
[140.8764686 u]
{-85.4329 MeV}
7/2-1.09(4)141La
142Ce5814284Cerium-142141.90925(2) u
[141.8774346 u]
{-84.53308 MeV}
0+142La
142Pr
143Ce5814385Cerium-143142.9123916(27) u
[142.8805762 u]
{-81.6067 MeV}
3/2-0.43(1)143La
144Ce5814486Cerium-144143.913653(3) u
[143.8818376 u]
{-80.43171 MeV}
0+144La
145Ce5814587Cerium-145144.91727(4) u
[144.8854546 u]
{-77.0625 MeV}
(5/2-)145La
146Ce5814688Cerium-146145.918802(18) u
[145.8869866 u]
{-75.63545 MeV}
0+146La
147Ce5814789Cerium-147146.922690(9) u
[146.8908746 u]
{-72.0138 MeV}
(5/2-)147La
148Ce5814890Cerium-148147.924424(12) u
[147.8926086 u]
{-70.39859 MeV}
0+148La
149Ce5814991Cerium-149148.928427(11) u
[148.8966116 u]
{-66.66982 MeV}
(3/2-)149La
150Ce5815092Cerium-150149.930384(13) u
[149.8985686 u]
{-64.84689 MeV}
0+150La
151Ce5815193Cerium-151150.934272(19) u
[150.9024566 u]
{-61.22524 MeV}
(5/2+)151La
152Ce5815294Cerium-152151.93668(21) u
[151.9048646 u]
{-58.9822 MeV}
0+152La
153Ce5815395Cerium-153152.94105(21) u
[152.9092346 u]
{-54.91157 MeV}
(3/2-)153La
154Ce5815496Cerium-154153.94394(21) u
[153.9121246 u]
{-52.21955 MeV}
0+154La
155Ce5815597Cerium-155154.94871(32) u
[154.9168946 u]
{-47.77633 MeV}
(5/2-)155La
156Ce5815698Cerium-156155.95188(32) u
[155.9200646 u]
{-44.82349 MeV}
0+
157Ce5815799Cerium-157156.95713(43) u
[156.9253146 u]
{-39.93315 MeV}
(7/2+)

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
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 %7.3(11) keV
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) ns2453.6(3) keVAL
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 %
?

63.09(9) keVAL
Ce-1323.51(11) hEC/β+132La100 %1.25(4) MeVAL
Ce-132m9.4(3) msIso → 132Ce100 %2.340 MeV2341.15(21) keVAL
Ce-13397(4) minEC/β+133La100 %2.9 MeVAL
Ce-133m5.1(3) hEC/β+133La
Iso → 133Ce
< 100 %
?

37.2(7) keVAL
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 MeV445.81(21) keVAL
Ce-136stable2 β+136Batheoret.AL
Ce-136m1.9(1) μsIso → 136Ce100 %3095.0(6) keVAL
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
254.29(5) keVAL
Ce-138stable2 β+138Ba?AL
Ce-138m8.73(20) msIso → 138Ce100 %2129.17(12) keVAL
Ce-139137.63(3) dEC → 139La100 %0.278(7) MeVAL
Ce-139m57.58(32) sIso → 139Ce100 %754.24(8) keVAL
Ce-140stableAL
Ce-140m7.3(15) μs2107.854(24) keVAL
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 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Cerium isotope.
6 - 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.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - 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.
10 - Decay: Half-live of the Cerium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: 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.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - 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
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
137Ce

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

3/2+
1,06(4)2,9065,390,01012
0,6326
141Ce

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

1) Quantity Percentage of natural occurrence.

2) 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.

 


Category: Isotopes

Last update: 05.07.2020



© 1996 - 2022 Internetchemistry




I agree!

This site uses cookies. By using this website, you agree to the use of cookies! Learn more ...