Lutetium-172m1

Properties and data of the isotope ¹⁷²Lu.

Content

General data

Name of the isotope:Lutetium-172m1; Lu-172m1Symbol:¹⁷²Lu or 17271LuMass number A:172 (= number of nucleons)Atomic number Z:71 (= number of protons)Neutrons N:101Isotopic mass:171.9390914(25) u (atomic weight of Lutetium-172m1)
Excitation energy: 41.86(4) keVNuclide mass:171.9001459 u (calculated nuclear mass without electrons)Mass excess:-56.736 MeVMass defect:1.491642388 u (per nucleus)Nuclear binding energy:1389.45593457 MeV (per nucleus)
8.07823218 MeV (average binding energy per nucleon)Half-life:3.7(5) minDecay constant λ:0.0031222845971169 s^-1Specific activity α:1.099581149043 × 10⁺¹⁹ Bq g^-1
297184094.33616 Ci g^-1Spin and parity:
(nuclear angular momentum)1-

Radioactive Decay

Half-life T_½ = 3.7(5) min (minutes) respectively 2.22 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁷²Lu	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
¹⁷²Lu		6.70(3) d	4-
^172m2Lu	65.79(4) keV	0.332(20) μs	(1)+
^172m3Lu	109.41(10) keV	440(12) μs	(1)+
^172m4Lu	213.57(17) keV	150 ns	(6-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 101) and isobaric (same nucleon number A = 172) with Lutetium-172m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 101	Isobar A = 172
59	¹⁶⁰Pr
60	¹⁶¹Nd
61	¹⁶²Pm
62	¹⁶³Sm
63	¹⁶⁴Eu
64	¹⁶⁵Gd
65	¹⁶⁶Tb	¹⁷²Tb
66	¹⁶⁷Dy	¹⁷²Dy
67	¹⁶⁸Ho	¹⁷²Ho
68	¹⁶⁹Er	¹⁷²Er
69	¹⁷⁰Tm	¹⁷²Tm
70	¹⁷¹Yb	¹⁷²Yb
71	¹⁷²Lu	¹⁷²Lu
72	¹⁷³Hf	¹⁷²Hf
73	¹⁷⁴Ta	¹⁷²Ta
74	¹⁷⁵W	¹⁷²W
75	¹⁷⁶Re	¹⁷²Re
76	¹⁷⁷Os	¹⁷²Os
77	¹⁷⁸Ir	¹⁷²Ir
78	¹⁷⁹Pt	¹⁷²Pt
79	¹⁸⁰Au	¹⁷²Au
80	¹⁸¹Hg	¹⁷²Hg
81	¹⁸²Tl
82	¹⁸³Pb
83	¹⁸⁴Bi