Thulium-147

Properties and data of the isotope ¹⁴⁷Tm.

Contents

General data

Name of the isotope:Thulium-147; Tm-147Symbol:¹⁴⁷Tm or 14769TmMass number A:147 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:78Isotopic mass:146.961380(7) u (atomic weight of Thulium-147)Nuclide mass:146.9235314 u (calculated nuclear mass without electrons)Mass excess:-35.9743 MeVMass defect:1.254410656 u (per nucleus)Nuclear binding energy:1168.4759996 MeV (per nucleus)
7.94881632 MeV (average binding energy per nucleon)Separation energy:S_N = 12.99(20) MeV (first neutron)Half-life:0.58(3) sDecay constant λ:1.195081345793 s^-1Specific activity α:4.929416577704 × 10⁺²¹ Bq g^-1
133227475073.09 Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-Year of discovery:1982

Radioactive Decay

Half-life T_½ = 0.58(3) s respectively 5.8 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
p	¹⁴⁶Er	15(5) %
EC/β⁺	¹⁴⁷Er	85(5) %	10.63(4) MeV

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
^147mTm	68(6) keV	0.36(4) ms	3/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 78) and isobaric (same nucleon number A = 147) with Thulium-147. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 78	Isobar A = 147
43	¹²¹Tc
44	¹²²Ru
45	¹²³Rh
46	¹²⁴Pd
47	¹²⁵Ag
48	¹²⁶Cd
49	¹²⁷In
50	¹²⁸Sn
51	¹²⁹Sb
52	¹³⁰Te
53	¹³¹I
54	¹³²Xe	¹⁴⁷Xe
55	¹³³Cs	¹⁴⁷Cs
56	¹³⁴Ba	¹⁴⁷Ba
57	¹³⁵La	¹⁴⁷La
58	¹³⁶Ce	¹⁴⁷Ce
59	¹³⁷Pr	¹⁴⁷Pr
60	¹³⁸Nd	¹⁴⁷Nd
61	¹³⁹Pm	¹⁴⁷Pm
62	¹⁴⁰Sm	¹⁴⁷Sm
63	¹⁴¹Eu	¹⁴⁷Eu
64	¹⁴²Gd	¹⁴⁷Gd
65	¹⁴³Tb	¹⁴⁷Tb
66	¹⁴⁴Dy	¹⁴⁷Dy
67	¹⁴⁵Ho	¹⁴⁷Ho
68	¹⁴⁶Er	¹⁴⁷Er
69	¹⁴⁷Tm	¹⁴⁷Tm
70	¹⁴⁸Yb
71	¹⁴⁹Lu