Thulium-162m

Properties and data of the isotope ¹⁶²Tm.

Content

General data

Name of the isotope:Thulium-162m; Tm-162mSymbol:¹⁶²Tm or 16269TmMass number A:162 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:93Isotopic mass:161.934001(28) u (atomic weight of Thulium-162m)
Excitation energy: +x keVNuclide mass:161.8961524 u (calculated nuclear mass without electrons)Mass excess:-61.47767 MeVMass defect:1.411763396 u (per nucleus)Nuclear binding energy:1315.04913279 MeV (per nucleus)
8.11758724 MeV (average binding energy per nucleon)Half-life:24.3(17) sDecay constant λ:0.028524575331685 s^-1Specific activity α:1.066950376504 × 10⁺²⁰ Bq g^-1
2883649666.2295 Ci g^-1Spin and parity:
(nuclear angular momentum)5+

Radioactive Decay

Half-life T_½ = 24.3(17) s respectively 2.43 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁶²Er	19(4) %
Iso	¹⁶²Tm	81(4) %

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
¹⁶²Tm		21.70(19) min	1-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 162) with Thulium-162m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 93	Isobar A = 162
54	¹⁴⁷Xe
55	¹⁴⁸Cs
56	¹⁴⁹Ba
57	¹⁵⁰La
58	¹⁵¹Ce
59	¹⁵²Pr
60	¹⁵³Nd	¹⁶²Nd
61	¹⁵⁴Pm	¹⁶²Pm
62	¹⁵⁵Sm	¹⁶²Sm
63	¹⁵⁶Eu	¹⁶²Eu
64	¹⁵⁷Gd	¹⁶²Gd
65	¹⁵⁸Tb	¹⁶²Tb
66	¹⁵⁹Dy	¹⁶²Dy
67	¹⁶⁰Ho	¹⁶²Ho
68	¹⁶¹Er	¹⁶²Er
69	¹⁶²Tm	¹⁶²Tm
70	¹⁶³Yb	¹⁶²Yb
71	¹⁶⁴Lu	¹⁶²Lu
72	¹⁶⁵Hf	¹⁶²Hf
73	¹⁶⁶Ta	¹⁶²Ta
74	¹⁶⁷W	¹⁶²W
75	¹⁶⁸Re	¹⁶²Re
76	¹⁶⁹Os	¹⁶²Os
77	¹⁷⁰Ir
78	¹⁷¹Pt
79	¹⁷²Au
80	¹⁷³Hg