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Isotopes of Lutetium

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

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

All atomic nuclei of the chemical element lutetium are summarized under lutetium isotopes; these consist of an atomic nucleus with 71 protons and, in the uncharged state, 71 electrons. The difference between the individual lutetium isotopes lies in the number of neutrons in the nucleus.

 

Naturally Occurring Lutetium Isotopes

Natural lutetium deposits are composed of the isotopes Lu-175 (stable) and Lu-176:

Atomic Mass maQuantityHalf-lifeSpin
Lutetium
Isotopic mixture		174,9668 u100 %
Isotope 175Lu174,94078(2) u97,401(13) %stable7/2+
Isotope 176Lu175,94269(2) u2,599(13) %3.76(7) × 1010 a7-

 

All other known and characterized lutetium nuclides are unstable.

 

Isotope Table: Lutetium

The two following tables list the most important data and properties of the Lutetium isotopes. Further information on the individual Lutetium 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
Lutetium-14914971Lu78149 u
[148.9610545 u]
{0 MeV}
Lutetium-15015071Lu79149.97355(32) u
[149.9346045 u]
{-24.63802 MeV}		(2+)
Lutetium-150m150m71Lu79149.97355(32) u
[149.9346045 u]
{-24.63802 MeV}		(1-,2-)
Lutetium-15115171Lu80150.96768(32) u
[150.9287345 u]
{-30.10589 MeV}		11/2-
Lutetium-151m151m71Lu80150.96768(32) u
[150.9287345 u]
{-30.10589 MeV}		3/2+
Lutetium-15215271Lu81151.96412(21) u
[151.9251745 u]
{-33.422 MeV}		(4-,5-,6-)
Lutetium-15315371Lu82152.95881(16) u
[152.9198645 u]
{-38.36824 MeV}		11/2-157Ta
Lutetium-15415471Lu83153.95742(22) u
[153.9184745 u]
{-39.66301 MeV}		(2-)158Ta
Lutetium-154m1154m171Lu83153.95736(21) u
[153.9184145 u]
{-39.7189 MeV}		(9+)
Lutetium-15515571Lu84154.954326(21) u
[154.9153805 u]
{-42.54506 MeV}		11/2-159Ta
Lutetium-155m1155m171Lu84154.954326(21) u
[154.9153805 u]
{-42.54506 MeV}		1/2+
Lutetium-155m2155m271Lu84154.954326(21) u
[154.9153805 u]
{-42.54506 MeV}		(25/2-)
Lutetium-15615671Lu85155.95309(6) u
[155.9141445 u]
{-43.69638 MeV}		(2)-160Ta
Lutetium-156m156m71Lu85155.95309(6) u
[155.9141445 u]
{-43.69638 MeV}		9+
Lutetium-15715771Lu86156.950144(13) u
[156.9111985 u]
{-46.44056 MeV}		(1/2+,3/2+)161Ta
Lutetium-157m157m71Lu86156.950144(13) u
[156.9111985 u]
{-46.44056 MeV}		(11/2-)
Lutetium-15815871Lu87157.949316(16) u
[157.9103705 u]
{-47.21184 MeV}		(2)-
Lutetium-15915971Lu88158.94664(4) u
[158.9076945 u]
{-49.70452 MeV}		163Ta
Lutetium-16016071Lu89159.94603(6) u
[159.9070845 u]
{-50.27273 MeV}		164Ta
160Hf
Lutetium-160m160m71Lu89159.94603(6) u
[159.9070845 u]
{-50.27273 MeV}
Lutetium-16116171Lu90160.94357(3) u
[160.9046245 u]
{-52.56421 MeV}		1/2+161Hf
Lutetium-161m161m71Lu90160.94357(3) u
[160.9046245 u]
{-52.56421 MeV}		(9/2-)
Lutetium-16216271Lu91161.94328(8) u
[161.9043345 u]
{-52.83434 MeV}		1-162Hf
Lutetium-162m1162m171Lu91161.94328(8) u
[161.9043345 u]
{-52.83434 MeV}		(4-)
Lutetium-162m2162m271Lu91161.94328(8) u
[161.9043345 u]
{-52.83434 MeV}
Lutetium-16316371Lu92162.94118(3) u
[162.9022345 u]
{-54.79048 MeV}		1/2(+)163Hf
Lutetium-16416471Lu93163.94134(3) u
[163.9023945 u]
{-54.64144 MeV}		1(-)164Hf
Lutetium-16516571Lu94164.939407(28) u
[164.9004615 u]
{-56.44202 MeV}		1/2+165Hf
Lutetium-16616671Lu95165.93986(3) u
[165.9009145 u]
{-56.02005 MeV}		6-166Hf
Lutetium-166m1166m171Lu95165.93986(3) u
[165.9009145 u]
{-56.02005 MeV}		3(-)
Lutetium-166m2166m271Lu95165.93986(3) u
[165.9009145 u]
{-56.02005 MeV}		0-
Lutetium-16716771Lu96166.93827(3) u
[166.8993245 u]
{-57.50112 MeV}		7/2+167Hf
Lutetium-167m167m71Lu96166.93827(3) u
[166.8993245 u]
{-57.50112 MeV}		1/2+
Lutetium-16816871Lu97167.93874(4) u
[167.8997945 u]
{-57.06332 MeV}		6(-)168Hf
Lutetium-168m168m71Lu97167.93874(4) u
[167.8997945 u]
{-57.06332 MeV}		3+
Lutetium-16916971Lu98168.937644(3) u
[168.8986985 u]
{-58.08424 MeV}		7/2+169Hf
Lutetium-169m169m71Lu98168.937644(3) u
[168.8986985 u]
{-58.08424 MeV}		1/2-
Lutetium-17017071Lu99169.938479(18) u
[169.8995335 u]
{-57.30644 MeV}		0+170Hf
Lutetium-170m170m71Lu99169.938479(18) u
[169.8995335 u]
{-57.30644 MeV}		(4)-
Lutetium-17117171Lu100170.9379187(20) u
[170.8989732 u]
{-57.82836 MeV}		7/2+171Hf
Lutetium-171m171m71Lu100170.9379187(20) u
[170.8989732 u]
{-57.82836 MeV}		1/2-
Lutetium-17217271Lu101171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}		4-172Hf
Lutetium-172m1172m171Lu101171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}		1-
Lutetium-172m2172m271Lu101171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}		(1)+
Lutetium-172m3172m371Lu101171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}		(1)+
Lutetium-172m4172m471Lu101171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}		(6-)
Lutetium-17317371Lu102172.9389358(17) u
[172.8999903 u]
{-56.88094 MeV}		7/2+173Hf
Lutetium-173m173m71Lu102172.9389358(17) u
[172.8999903 u]
{-56.88094 MeV}		5/2-
Lutetium-17417471Lu103173.9403429(17) u
[173.9013974 u]
{-55.57023 MeV}		(1)-
Lutetium-174m1174m171Lu103173.9403429(17) u
[173.9013974 u]
{-55.57023 MeV}		(6)-
Lutetium-174m2174m271Lu103173.9403429(17) u
[173.9013974 u]
{-55.57023 MeV}		(3+)
Lutetium-174m3174m371Lu103173.9403429(17) u
[173.9013974 u]
{-55.57023 MeV}		(4-)
Lutetium-17517571Lu104174.94078(2) u
[174.9018345 u]
{-55.16307 MeV}		7/2+175Hf
175Yb
Lutetium-175m1175m171Lu104174.94078(2) u
[174.9018345 u]
{-55.16307 MeV}		5/2-
Lutetium-175m2175m271Lu104174.94078(2) u
[174.9018345 u]
{-55.16307 MeV}		(19/2+)
Lutetium-17617671Lu105175.94269(2) u
[175.9037445 u]
{-53.38392 MeV}		7-
Lutetium-176m176m71Lu105175.94269(2) u
[175.9037445 u]
{-53.38392 MeV}		1-
Lutetium-17717771Lu106176.9437636(13) u
[176.9048181 u]
{-52.38387 MeV}		7/2+177Yb
Lutetium-177m177m71Lu106176.9437636(13) u
[176.9048181 u]
{-52.38387 MeV}		23/2-
Lutetium-177m1177m171Lu106176.9437636(13) u
[176.9048181 u]
{-52.38387 MeV}		9/2-
Lutetium-177m2177m271Lu106176.9437636(13) u
[176.9048181 u]
{-52.38387 MeV}		1/2+
Lutetium-177m7177m771Lu106176.9437636(13) u
[176.9048181 u]
{-52.38387 MeV}		33/2+
Lutetium-177m8177m871Lu106176.9437636(13) u
[176.9048181 u]
{-52.38387 MeV}		39/2-
Lutetium-17817871Lu107177.9459602(24) u
[177.9070147 u]
{-50.33775 MeV}		1(+)178Yb
Lutetium-178m178m71Lu107177.9459602(24) u
[177.9070147 u]
{-50.33775 MeV}		(9-)
Lutetium-17917971Lu108178.947333(6) u
[178.9083875 u]
{-49.05899 MeV}		7/2+179Yb
Lutetium-179m179m71Lu108178.947333(6) u
[178.9083875 u]
{-49.05899 MeV}		1/2+
Lutetium-18018071Lu109179.94989(8) u
[179.9109445 u]
{-46.67716 MeV}		5+180Yb
Lutetium-18118171Lu110180.95191(13) u
[180.9129645 u]
{-44.79555 MeV}		(7/2+)
Lutetium-18218271Lu111181.95504(21) u
[181.9160945 u]
{-41.87997 MeV}
Lutetium-18318371Lu112182.95736(9) u
[182.9184145 u]
{-39.7189 MeV}		(7/2+)
Lutetium-18418471Lu113183.96091(32) u
[183.9219645 u]
{-36.4121 MeV}		(3+)
Lutetium-18518571Lu114184.96362(32) u
[184.9246745 u]
{-33.88775 MeV}
Lutetium-18618671Lu115185.96757(43) u
[185.9286245 u]
{-30.20835 MeV}
Lutetium-18718771Lu116186.97039(43) u
[186.9314445 u]
{-27.58154 MeV}
Lutetium-18818871Lu117187.97446(54) u
[187.9355145 u]
{-23.79036 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Lu-149450 nsp → 148Yb
Lu-1500.045(3) sp → 149Yb
EC/β+ → 150Yb		70.9(19) %
29.1(19) %
AL
Lu-150m39 μsp → 149Yb100 %
Lu-15180.6(20) msp → 150Yb
EC/β+ → 151Yb		63.4(9) %
36.6(9) %
AL
Lu-151m16(1) μsp → 150Yb100 %
Lu-1520.7(1) sEC/β+ → 152Yb
β+, p → 151Tm
15(7) %		12.85(25) MeV
AL
Lu-1530.9(2) sα → 149Tm
EC/β+ → 153Yb		ca. 70 %
ca. 30 %		3.08(25) MeV
8.84(25) MeV		AL
Lu-154AL
Lu-154m11.12(8) sEC/β+ → 154Yb
EC, p 		100 %
Lu-15568(1) msEC/β+ → 155Yb
α → 151Tm		10(2) %
90(2) %		7.958(25) MeV
5.8028(26) MeV		AL
Lu-155m1138(8) msEC/β+ → 155Yb
α → 151Tm		24(16) %
76(16) %
Lu-155m22.69(3) msα → 151Tmca. 100 %
Lu-156494(12) msα → 152Tm
EC/β+ → 156Yb		ca. 95 %
ca. 5 %		5.596(3) MeV
9.57(5) MeV		AL
Lu-156m198(2) msα → 152Tm100 %
Lu-1576.8(18) sα → 153Tm> 0 %5.1079(28) MeVAL
Lu-157m4.79(12) sα → 153Tm
EC/β+ → 157Yb		6(2) %
94(2) %
Lu-15810.6(3) sα → 154Tm
EC/β+ → 158Yb		0.91(20) %
99.09(10) %
Lu-15912.1(10) sEC/β+ → 159Yb
α → 155Tm		ca. 100 %
~ 0.1 %		6.13(4) MeV
4.49(4) MeV		AL
Lu-16036.1(3) sEC/β+ → 160Yb
α → 156Tm		≥ 99.999 %
≤ 0.0001 %		7.89(6) MeV
4.14(6)		AL
Lu-160m40(1) sEC/β+ → 160Yb
α → 156Tm		≤ 100 %
?
Lu-16177(2) sEC/β+ → 161Yb100 %5.28(3) MeVAL
Lu-161m7.3(4) msIso → 161Luca. 100 %
Lu-1621.37(2) minEC/β+ → 162Yb≤ 100 %6.99(8) MeVAL
Lu-162m11.5 minEC/β+ → 162Yb≤ 100 %
Lu-162m21.9 minEC/β+ → 162Yb≤ 100 %
Lu-1633.97(13) minEC/β+ → 163Yb100 %4.51(3) MeVAL
Lu-1643.14(3) minEC/β+ → 164Yb100 %6.38(3) MeVAL
Lu-16510.74(10) minEC/β+ → 165Yb100 %3.85(4) MeVAL
Lu-1662.65(10) minEC/β+ → 166Yb100 %5.57(3) MeVAL
Lu-166m11.41(10) minEC/β+ → 166Yb
Iso → 166Lu		58(5) %
42(5) %
Lu-166m22.12(10) minEC/β+ → 166Yb
Iso → 166Lu		> 80 %
< 10 %
Lu-16751.5(10) minEC/β+ → 167Yb100 %3.09(3) MeVAL
Lu-167m1 minEC/β+ → 167Yb
Iso → 167Lu		?
?
Lu-1685.5(1) minEC/β+ → 168Yb100 %4.51(4) MeVAL
Lu-168m6.7(4) minEC/β+ → 168Yb
Iso → 168Lu		> 99.6(4) %
< 0.8 %
Lu-16934.06(5) hEC/β+ → 169Yb100 %2.293(3) MeVAL
Lu-169m160(10) sIso → 169Lu100 %
Lu-1702.012(20) dEC/β+ → 170Yb100 %3.458(17) MeVAL
Lu-170m0.67(10) sIso → 170Lu100 %
Lu-1718.247(23) dEC/β+ → 171Yb100 %1.4784(19) MeVAL
Lu-171m79(2) sIso → 171Lu100 %
Lu-1726.70(3) dEC/β+ → 172Yb100 %2.5195(23) MeVAL
Lu-172m13.7(5) minIso → 172Lu100 %
Lu-172m20.332(20) μs
Lu-172m3440(12) μsIso → 172Lu100 %
Lu-172m4150 ns
Lu-1731.37(1) aEC → 173Yb100 %0.6703(16) MeVAL
Lu-173m74.2(10) μs
Lu-1743.31(5) aEC/β+ → 174Yb100 %1.3743(16) MeVAL
Lu-174m1142(2) dIso → 174Lu
EC → 174Yb		99.38(2) %
0.62(2) %
Lu-174m2395(15) nsIso → 174Lu
Lu-174m3145(3) nsIso → 174Lu100 %
Lu-175stableAL
Lu-175m11.49(7) μs
Lu-175m2984(30) μs
Lu-1763.76(7) × 1010 aβ- → 176Hf100 %1.1941(9) MeVAL
Lu-176m3.664(19) hβ- → 176Hf
EC → 176Yb		99.905(16) %
0.095(16) %
Lu-1776.6443(9) dβ- → 177Hf100 %0.4968(8) MeVAL
Lu-177m160.4(3) dβ- → 177Hf
Iso → 177Lu		77.30(8) %
22.70(8) %
Lu-177m1133.1(24) ns
Lu-177m2155(7) μs
Lu-177m7625(62) nsβ- → 177Hf
Iso → 177Lu		≤ 100 %
?
Lu-177m86(2) μsIso → 177Lu100 %
Lu-17828.4(2) minβ- → 178Hf100 %2.0975(21) MeVAL
Lu-178m23.1(3) minβ- → 178Hf100 %
Lu-1794.59(6) hβ- → 179Hf100 %1.404(5) MeVAL
Lu-179m3.1(9) msIso → 179Lu100 %
Lu-1805.7(1) minβ- → 180Hf100 %3.10(7) MeVAL
Lu-1813.5(3) minβ- → 181Hf100 %2.61(13) MeVAL
Lu-1822.0(2) minβ- → 182Hf100 %4.17(20) MeVAL
Lu-18358(4) sβ- → 183Hf100 %3.57(9) MeVAL
Lu-18419(2) sβ- → 184Hf100 %5.09(30) MeVAL
Lu-185160 nsβ- → 185Hf?4.43(30) MeV
Lu-186160 nsβ- → 186Hf?6.21(40) MeV
Lu-187160 nsβ- → 187Hf
β-, n → 186Hf		?
?		5.24(40) MeV
0.77(40) MeV
Lu-188β- → 188Hf?7.09(58) MeV

 

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 Lutetium 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 Lutetium 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 Lutetium 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)
175Lu
97,401(13) %
7/2+		+ 2,2327(11)3,0589
{+ 3,49(2)}		4,86260,03128
2,3984
176Lu
2,599(13) %
7-		+ 3,1692(45)4,7348
{+ 4,97(3)}		3,4510,03975
6,0518

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 Lutetium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Lu-169+106 Bq10 Bq/g1.4 d
Lu-170106 Bq10 Bq/g2.0 d
Lu-171106 Bq10 Bq/g8.3 d
Lu-172106 Bq10 Bq/g0,04 TBq6.7 d
Lu-173107 Bq1 Bq/g0,9 TBq1.3 a
Lu-174107 Bq1 Bq/g0,8 TBq3.6 a
Lu-174m107 Bq10 Bq/g142.0 d
Lu-176106 Bq0,1 Bq/g4.0 × 1010 a
Lu-176m106 Bq1000 Bq/g3.6 h
Lu-177107 Bq100 Bq/g2 TBq100 Bq cm-26.6 d
Lu-177m+106 Bq0,1 Bq/g160.3 d
Lu-178105 Bq100 Bq/g28.4 min
Lu-178m+105 Bq10 Bq/g23.1 min
Lu-179106 Bq1000 Bq/g4.6 h

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

 

Literature Sources and References

Properties of the Lutetium 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.

Lutetium: NMR properties - 175Lu-NMR, 176Lu-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.

[9] - Aleksei B D'yachkov et al.:
Selective photoionisation of lutetium isotopes.
In: Quantum Electronics, (2012), DOI 10.1070/QE2012v042n10ABEH014929.

[10] - J. L. Gross, M. Thoennessen:
Discovery of gallium, germanium, lutetium, and hafnium isotopes.
In: Atomic Data and Nuclear Data Tables, (2012), DOI 10.1016/j.adt.2011.09.004.

 

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