Thulium-167

Properties and data of the isotope ¹⁶⁷Tm.

Contents

General data

Name of the isotope:Thulium-167; Tm-167Symbol:¹⁶⁷Tm or 16769TmMass number A:167 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:98Isotopic mass:166.9328566(14) u (atomic weight of Thulium-167)Nuclide mass:166.895008 u (calculated nuclear mass without electrons)Mass excess:-62.54367 MeVMass defect:1.456232376 u (per nucleus)Nuclear binding energy:1356.47172085 MeV (per nucleus)
8.12258515 MeV (average binding energy per nucleon)Separation energy:S_N = 8.727(12) MeV (first neutron)
S_P = 4.9066(15) MeV (first proton)Half-life:9.25(2) dDecay constant λ:8.673012769769 × 10^-7 s^-1Specific activity α:3.146391842143 × 10⁺¹⁵ Bq g^-1
85037.617355224 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Magnetic dipole moment:μ(μ_N) = - 0.197(2)Nuclear g-factor:g_l = -0.394Charge radius:5.2129(36) femtometer fmYear of discovery:1948

Radioactive Decay

Half-life T_½ = 9.25(2) d respectively 7.99200 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	¹⁶⁷Er	100 %	0.7475(17) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶⁷Yb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 167) with Thulium-167. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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