Thulium-160m

Properties and data of the isotope ^160mTm.

Contents

General data

Name of the isotope:Thulium-160m; Tm-160mSymbol:^160mTm or 160m69TmMass number A:160 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:91Isotopic mass:159.93526(4) u (atomic weight of Thulium-160m)
Excitation energy: 70(20) keVNuclide mass:159.8974114 u (calculated nuclear mass without electrons)Mass excess:-60.30492 MeVMass defect:1.393174564 u (per nucleus)Nuclear binding energy:1297.73374732 MeV (per nucleus)
8.11083592 MeV (average binding energy per nucleon)Half-life:74.5(15) sDecay constant λ:0.0093039890008046 s^-1Specific activity α:3.523895114600 × 10⁺¹⁹ Bq g^-1
952404085.02716 Ci g^-1Spin and parity:
(nuclear angular momentum)5

Radioactive Decay

Half-life T_½ = 74.5(15) s respectively 7.45 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁶⁰Er	15(5) %
Iso	¹⁶⁰Tm	85(5) %

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
¹⁶⁰Tm		9.4(3) min	1-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 160) with Thulium-160m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 91	Isobar A = 160
52	¹⁴³Te
53	¹⁴⁴I
54	¹⁴⁵Xe
55	¹⁴⁶Cs
56	¹⁴⁷Ba
57	¹⁴⁸La
58	¹⁴⁹Ce
59	¹⁵⁰Pr	¹⁶⁰Pr
60	¹⁵¹Nd	¹⁶⁰Nd
61	¹⁵²Pm	¹⁶⁰Pm
62	¹⁵³Sm	¹⁶⁰Sm
63	¹⁵⁴Eu	¹⁶⁰Eu
64	¹⁵⁵Gd	¹⁶⁰Gd
65	¹⁵⁶Tb	¹⁶⁰Tb
66	¹⁵⁷Dy	¹⁶⁰Dy
67	¹⁵⁸Ho	¹⁶⁰Ho
68	¹⁵⁹Er	¹⁶⁰Er
69	¹⁶⁰Tm	¹⁶⁰Tm
70	¹⁶¹Yb	¹⁶⁰Yb
71	¹⁶²Lu	¹⁶⁰Lu
72	¹⁶³Hf	¹⁶⁰Hf
73	¹⁶⁴Ta	¹⁶⁰Ta
74	¹⁶⁵W	¹⁶⁰W
75	¹⁶⁶Re	¹⁶⁰Re
76	¹⁶⁷Os	¹⁶⁰Os
77	¹⁶⁸Ir
78	¹⁶⁹Pt
79	¹⁷⁰Au
80	¹⁷¹Hg