Lutetium-169m

Properties and data of the isotope ¹⁶⁹Lu.

Content

General data

Name of the isotope:Lutetium-169m; Lu-169mSymbol:¹⁶⁹Lu or 16971LuMass number A:169 (= number of nucleons)Atomic number Z:71 (= number of protons)Neutrons N:98Isotopic mass:168.937644(3) u (atomic weight of Lutetium-169m)
Excitation energy: 29.0(5) keVNuclide mass:168.8986985 u (calculated nuclear mass without electrons)Mass excess:-58.08424 MeVMass defect:1.46709504 u (per nucleus)Nuclear binding energy:1366.59022719 MeV (per nucleus)
8.08633271 MeV (average binding energy per nucleon)Half-life:160(10) sDecay constant λ:0.0043321698784997 s^-1Specific activity α:1.552912930803 × 10⁺¹⁹ Bq g^-1
419706197.51449 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = 0.538(7)Nuclear g-factor:g_l = 1.076

Radioactive Decay

Half-life T_½ = 160(10) s respectively 1.60 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁶⁹Lu	100 %

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹⁶⁹Lu		34.06(5) h	7/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 169) with Lutetium-169m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 98	Isobar A = 169
57	¹⁵⁵La
58	¹⁵⁶Ce
59	¹⁵⁷Pr
60	¹⁵⁸Nd
61	¹⁵⁹Pm
62	¹⁶⁰Sm
63	¹⁶¹Eu
64	¹⁶²Gd	¹⁶⁹Gd
65	¹⁶³Tb	¹⁶⁹Tb
66	¹⁶⁴Dy	¹⁶⁹Dy
67	¹⁶⁵Ho	¹⁶⁹Ho
68	¹⁶⁶Er	¹⁶⁹Er
69	¹⁶⁷Tm	¹⁶⁹Tm
70	¹⁶⁸Yb	¹⁶⁹Yb
71	¹⁶⁹Lu	¹⁶⁹Lu
72	¹⁷⁰Hf	¹⁶⁹Hf
73	¹⁷¹Ta	¹⁶⁹Ta
74	¹⁷²W	¹⁶⁹W
75	¹⁷³Re	¹⁶⁹Re
76	¹⁷⁴Os	¹⁶⁹Os
77	¹⁷⁵Ir	¹⁶⁹Ir
78	¹⁷⁶Pt	¹⁶⁹Pt
79	¹⁷⁷Au
80	¹⁷⁸Hg
81	¹⁷⁹Tl
82	¹⁸⁰Pb