Thulium-150

Properties and data of the isotope ¹⁵⁰Tm.

Contents

General data

Name of the isotope:Thulium-150; Tm-150Symbol:¹⁵⁰Tm or 15069TmMass number A:150 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:81Isotopic mass:149.95009(21) u (atomic weight of Thulium-150)Nuclide mass:149.9122414 u (calculated nuclear mass without electrons)Mass excess:-46.49087 MeVMass defect:1.291695404 u (per nucleus)Nuclear binding energy:1203.20651865 MeV (per nucleus)
8.02137679 MeV (average binding energy per nucleon)Separation energy:S_N = 10.68(28) MeV (first neutron)
S_P = 0.04 MeV (first proton)Half-life:2.20(6) sDecay constant λ:0.31506690025452 s^-1Specific activity α:1.273407552776 × 10⁺²¹ Bq g^-1
34416420345.3 Ci g^-1Spin and parity:
(nuclear angular momentum)(6-)Year of discovery:1982

Radioactive Decay

Half-life T_½ = 2.20(6) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁵⁰Er	98.8 %	11.34(20) MeV
EC, p	¹⁴⁹Ho	1.2 %

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
^150mTm	671.3(10) keV	5.2(3) ms	(10+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 81) and isobaric (same nucleon number A = 150) with Thulium-150. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 81	Isobar A = 150
45	¹²⁶Rh
46	¹²⁷Pd
47	¹²⁸Ag
48	¹²⁹Cd
49	¹³⁰In
50	¹³¹Sn
51	¹³²Sb
52	¹³³Te
53	¹³⁴I
54	¹³⁵Xe
55	¹³⁶Cs	¹⁵⁰Cs
56	¹³⁷Ba	¹⁵⁰Ba
57	¹³⁸La	¹⁵⁰La
58	¹³⁹Ce	¹⁵⁰Ce
59	¹⁴⁰Pr	¹⁵⁰Pr
60	¹⁴¹Nd	¹⁵⁰Nd
61	¹⁴²Pm	¹⁵⁰Pm
62	¹⁴³Sm	¹⁵⁰Sm
63	¹⁴⁴Eu	¹⁵⁰Eu
64	¹⁴⁵Gd	¹⁵⁰Gd
65	¹⁴⁶Tb	¹⁵⁰Tb
66	¹⁴⁷Dy	¹⁵⁰Dy
67	¹⁴⁸Ho	¹⁵⁰Ho
68	¹⁴⁹Er	¹⁵⁰Er
69	¹⁵⁰Tm	¹⁵⁰Tm
70	¹⁵¹Yb	¹⁵⁰Yb
71	¹⁵²Lu	¹⁵⁰Lu
72	¹⁵³Hf