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Isotopes of Lutetium

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

 

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

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
150Lu7115079Lutetium-150149.97355(32) u
[149.9346045 u]
{-24.63802 MeV}
(2+)
150mLu7115079Lutetium-150m149.97355(32) u
[149.9346045 u]
{-24.63802 MeV}
(1-,2-)
151Lu7115180Lutetium-151150.96768(32) u
[150.9287345 u]
{-30.10589 MeV}
11/2-
151mLu7115180Lutetium-151m150.96768(32) u
[150.9287345 u]
{-30.10589 MeV}
3/2+
152Lu7115281Lutetium-152151.96412(21) u
[151.9251745 u]
{-33.422 MeV}
(4-,5-,6-)
153Lu7115382Lutetium-153152.95881(16) u
[152.9198645 u]
{-38.36824 MeV}
11/2-157Ta
154Lu7115483Lutetium-154153.95736(21) u
[153.9184145 u]
{-39.7189 MeV}
(2-)158Ta
154m1Lu7115483Lutetium-154m1153.95736(21) u
[153.9184145 u]
{-39.7189 MeV}
(9+)
155Lu7115584Lutetium-155154.954326(21) u
[154.9153805 u]
{-42.54506 MeV}
11/2-159Ta
155m1Lu7115584Lutetium-155m1154.954326(21) u
[154.9153805 u]
{-42.54506 MeV}
1/2+
155m2Lu7115584Lutetium-155m2154.954326(21) u
[154.9153805 u]
{-42.54506 MeV}
(25/2-)
156Lu7115685Lutetium-156155.95309(6) u
[155.9141445 u]
{-43.69638 MeV}
(2)-160Ta
156mLu7115685Lutetium-156m155.95309(6) u
[155.9141445 u]
{-43.69638 MeV}
9+
157Lu7115786Lutetium-157156.950144(13) u
[156.9111985 u]
{-46.44056 MeV}
(1/2+,3/2+)161Ta
157mLu7115786Lutetium-157m156.950144(13) u
[156.9111985 u]
{-46.44056 MeV}
(11/2-)
158Lu7115887Lutetium-158157.949316(16) u
[157.9103705 u]
{-47.21184 MeV}
(2)-
159Lu7115988Lutetium-159158.94664(4) u
[158.9076945 u]
{-49.70452 MeV}
163Ta
160Lu7116089Lutetium-160159.94603(6) u
[159.9070845 u]
{-50.27273 MeV}
164Ta
160Hf
160mLu7116089Lutetium-160m159.94603(6) u
[159.9070845 u]
{-50.27273 MeV}
161Lu7116190Lutetium-161160.94357(3) u
[160.9046245 u]
{-52.56421 MeV}
1/2++ 0.223(3)161Hf
161mLu7116190Lutetium-161m160.94357(3) u
[160.9046245 u]
{-52.56421 MeV}
(9/2-)
162Lu7116291Lutetium-162161.94328(8) u
[161.9043345 u]
{-52.83434 MeV}
1-+ 0.0553(11)162Hf
162m1Lu7116291Lutetium-162m1161.94328(8) u
[161.9043345 u]
{-52.83434 MeV}
(4-)
162m2Lu7116291Lutetium-162m2161.94328(8) u
[161.9043345 u]
{-52.83434 MeV}
163Lu7116392Lutetium-163162.94118(3) u
[162.9022345 u]
{-54.79048 MeV}
1/2(+)+ 0.0769(10)163Hf
164Lu7116493Lutetium-164163.94134(3) u
[163.9023945 u]
{-54.64144 MeV}
1(-)+ 0.0591(11)164Hf
165Lu7116594Lutetium-165164.939407(28) u
[164.9004615 u]
{-56.44202 MeV}
1/2+- 0.0245(3)165Hf
166Lu7116695Lutetium-166165.93986(3) u
[165.9009145 u]
{-56.02005 MeV}
6-+ 2.912(12)166Hf
166m1Lu7116695Lutetium-166m1165.93986(3) u
[165.9009145 u]
{-56.02005 MeV}
3(-)+ 0.189(5)
166m2Lu7116695Lutetium-166m2165.93986(3) u
[165.9009145 u]
{-56.02005 MeV}
0-
167Lu7116796Lutetium-167166.93827(3) u
[166.8993245 u]
{-57.50112 MeV}
7/2++ 2.325(4)167Hf
167mLu7116796Lutetium-167m166.93827(3) u
[166.8993245 u]
{-57.50112 MeV}
1/2+- 0.0999(13)
168Lu7116897Lutetium-168167.93874(4) u
[167.8997945 u]
{-57.06332 MeV}
6(-)3.016(25)168Hf
168mLu7116897Lutetium-168m167.93874(4) u
[167.8997945 u]
{-57.06332 MeV}
3+1.221(5)
169Lu7116998Lutetium-169168.937644(3) u
[168.8986985 u]
{-58.08424 MeV}
7/2+2.295(4)169Hf
169mLu7116998Lutetium-169m168.937644(3) u
[168.8986985 u]
{-58.08424 MeV}
1/2-0.538(7)
170Lu7117099Lutetium-170169.938479(18) u
[169.8995335 u]
{-57.30644 MeV}
0+170Hf
170mLu7117099Lutetium-170m169.938479(18) u
[169.8995335 u]
{-57.30644 MeV}
(4)-
171Lu71171100Lutetium-171170.9379187(20) u
[170.8989732 u]
{-57.82836 MeV}
7/2+2.293(4)171Hf
171mLu71171100Lutetium-171m170.9379187(20) u
[170.8989732 u]
{-57.82836 MeV}
1/2-0.585(7)
172Lu71172101Lutetium-172171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}
4-2.25(10)172Hf
172m1Lu71172101Lutetium-172m1171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}
1-
172m2Lu71172101Lutetium-172m2171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}
(1)+
172m3Lu71172101Lutetium-172m3171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}
(1)+
172m4Lu71172101Lutetium-172m4171.9390914(25) u
[171.9001459 u]
{-56.736 MeV}
(6-)
173Lu71173102Lutetium-173172.9389358(17) u
[172.8999903 u]
{-56.88094 MeV}
7/2+2.34(9)173Hf
173mLu71173102Lutetium-173m172.9389358(17) u
[172.8999903 u]
{-56.88094 MeV}
5/2-
174Lu71174103Lutetium-174173.9403429(17) u
[173.9013974 u]
{-55.57023 MeV}
(1)-1.94(28)
174m1Lu71174103Lutetium-174m1173.9403429(17) u
[173.9013974 u]
{-55.57023 MeV}
(6)-1.497(10)
174m2Lu71174103Lutetium-174m2173.9403429(17) u
[173.9013974 u]
{-55.57023 MeV}
(3+)
174m3Lu71174103Lutetium-174m3173.9403429(17) u
[173.9013974 u]
{-55.57023 MeV}
(4-)
175Lu71175104Lutetium-175174.94078(2) u
[174.9018345 u]
{-55.16307 MeV}
7/2++ 2.2327(11)175Hf
175Yb
175m1Lu71175104Lutetium-175m1174.94078(2) u
[174.9018345 u]
{-55.16307 MeV}
5/2-
175m2Lu71175104Lutetium-175m2174.94078(2) u
[174.9018345 u]
{-55.16307 MeV}
(19/2+)
176Lu71176105Lutetium-176175.94269(2) u
[175.9037445 u]
{-53.38392 MeV}
7-+ 3.1692(45)
176mLu71176105Lutetium-176m175.94269(2) u
[175.9037445 u]
{-53.38392 MeV}
1-+ 0.318(3)
177Lu71177106Lutetium-177176.9437637(13) u
[176.9048182 u]
{-52.38378 MeV}
7/2++2.2384(14)177Yb
177m1Lu71177106Lutetium-177m1176.9437637(13) u
[176.9048182 u]
{-52.38378 MeV}
9/2-+5.5(3)
177m2Lu71177106Lutetium-177m2176.9437637(13) u
[176.9048182 u]
{-52.38378 MeV}
1/2+
177m4Lu71177106Lutetium-177m4176.9437637(13) u
[176.9048182 u]
{-52.38378 MeV}
23/2-2.320(14)
177m7Lu71177106Lutetium-177m7176.9437637(13) u
[176.9048182 u]
{-52.38378 MeV}
33/2+
177m8Lu71177106Lutetium-177m8176.9437637(13) u
[176.9048182 u]
{-52.38378 MeV}
39/2-
178Lu71178107Lutetium-178177.9459602(24) u
[177.9070147 u]
{-50.33775 MeV}
1(+)178Yb
178mLu71178107Lutetium-178m177.9459602(24) u
[177.9070147 u]
{-50.33775 MeV}
(9-)
179Lu71179108Lutetium-179178.947333(6) u
[178.9083875 u]
{-49.05899 MeV}
7/2+2.375(12)179Yb
179mLu71179108Lutetium-179m178.947333(6) u
[178.9083875 u]
{-49.05899 MeV}
1/2+
180Lu71180109Lutetium-180179.94989(8) u
[179.9109445 u]
{-46.67716 MeV}
5+180Yb
181Lu71181110Lutetium-181180.95191(13) u
[180.9129645 u]
{-44.79555 MeV}
(7/2+)
182Lu71182111Lutetium-182181.95504(21) u
[181.9160945 u]
{-41.87997 MeV}
183Lu71183112Lutetium-183182.95736(9) u
[182.9184145 u]
{-39.7189 MeV}
(7/2+)
184Lu71184113Lutetium-184183.96091(32) u
[183.9219645 u]
{-36.4121 MeV}
(3+)
185Lu71185114Lutetium-185184.96362(32) u
[184.9246745 u]
{-33.88775 MeV}
186Lu71186115Lutetium-186185.96757(43) u
[185.9286245 u]
{-30.20835 MeV}
187Lu71187116Lutetium-187186.97039(43) u
[186.9314445 u]
{-27.58154 MeV}
188Lu71188117Lutetium-188187.97446(54) u
[187.9355145 u]
{-23.79036 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Lu-1500.045(3) sp → 149Yb
EC/β+150Yb
70.9(19) %
29.1(19) %

AL
Lu-150m39 μsp → 149Yb100 %22(6) keV
Lu-15180.6(20) msp → 150Yb
EC/β+151Yb
63.4(9) %
36.6(9) %

AL
Lu-151m16(1) μsp → 150Yb100 %78(10) keV
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 %

+x
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) %

20(6) keV
Lu-155m22.69(3) msα → 151Tmca. 100 %1781(2) keV
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 %+x keV
Lu-1576.8(18) sα → 153Tm> 0 %5.1079(28) MeVAL
Lu-157m4.79(12) sα → 153Tm
EC/β+157Yb
6(2) %
94(2) %

20.9(20) keV
Lu-15810.6(3) sα → 154Tm
EC/β+158Yb
0.91(20) %
99.09(10) %

≥ 0 keV
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 %166+x keV
Lu-1621.37(2) minEC/β+162Yb≤ 100 %6.99(8) MeVAL
Lu-162m11.5 minEC/β+162Yb≤ 100 %X
Lu-162m21.9 minEC/β+162Yb≤ 100 %Y
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) %

34.37(22) keV
Lu-166m22.12(10) minEC/β+166Yb
Iso → 166Lu
> 80 %
< 10 %

43.0(4) keV
Lu-16751.5(10) minEC/β+167Yb100 %3.09(3) MeVAL
Lu-167m1 minEC/β+167Yb
Iso → 167Lu
?
?

X
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 %

202.81(12) keV
Lu-16934.06(5) hEC/β+169Yb100 %2.293(3) MeVAL
Lu-169m160(10) sIso → 169Lu100 %29.0(5) keV
Lu-1702.012(20) dEC/β+170Yb100 %3.458(17) MeVAL
Lu-170m0.67(10) sIso → 170Lu100 %92.91(9) keV
Lu-1718.247(23) dEC/β+171Yb100 %1.4784(19) MeVAL
Lu-171m79(2) sIso → 171Lu100 %71.13(8) keV
Lu-1726.70(3) dEC/β+172Yb100 %2.5195(23) MeVAL
Lu-172m13.7(5) minIso → 172Lu100 %41.86(4) keV
Lu-172m20.332(20) μs65.79(4) keV
Lu-172m3440(12) μsIso → 172Lu100 %109.41(10) keV
Lu-172m4150 ns213.57(17) keV
Lu-1731.37(1) aEC → 173Yb100 %0.6703(16) MeVAL
Lu-173m74.2(10) μs123.672(13) keV
Lu-1743.31(5) aEC/β+174Yb100 %1.3743(16) MeVAL
Lu-174m1142(2) dIso → 174Lu
EC → 174Yb
99.38(2) %
0.62(2) %

170.83(5) keV
Lu-174m2395(15) nsIso → 174Lu240.818(4) keV
Lu-174m3145(3) nsIso → 174Lu100 %365.183(6) keV
Lu-175stableAL
Lu-175m11.49(7) μs353.48(13) keV
Lu-175m2984(30) μs1392.2(6) keV
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) %

122.845(4) keV
Lu-1776.6443(9) dβ-177Hf100 %0.4968(8) MeVAL
Lu-177m1133.1(24) ns150.3984(10) keV
Lu-177m2155(7) μs569.6721(15) keV
Lu-177m4160.4(3) dβ-177Hf
Iso → 177Lu
77.30(8) %
22.70(8) %

970.1757(24) keV
Lu-177m7625(62) nsβ-177Hf
Iso → 177Lu
≤ 100 %
?

2771.7(5) keV
Lu-177m86(2) μsIso → 177Lu100 %3530.4(6) keV
Lu-17828.4(2) minβ-178Hf100 %2.0975(21) MeVAL
Lu-178m23.1(3) minβ-178Hf100 %123.8(26) keV
Lu-1794.59(6) hβ-179Hf100 %1.404(5) MeVAL
Lu-179m3.1(9) msIso → 179Lu100 %592.4(4) keV
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 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Lutetium isotope.
6 - 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.
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 Lutetium 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 Lutetium 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)
175Lu
97,401(13) %
7/2+
+ 2,2327(11)3,0589+ 349,0(20)4,86260,03128
2,3984
176Lu
2,599(13) %
7-
+ 3,1692(45)4,7348+ 497,0(30)3,4510,03975
6,0518

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 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.

 


Category: Isotopes

Last update: 05.07.2020



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