Thulium-144

Properties and data of the isotope ¹⁴⁴Tm.

Contents

General data

Name of the isotope:Thulium-144; Tm-144Symbol:¹⁴⁴Tm or 14469TmMass number A:144 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:75Isotopic mass:143.97610(43) u (atomic weight of Thulium-144)Nuclide mass:143.9382514 u (calculated nuclear mass without electrons)Mass excess:-22.26271 MeVMass defect:1.213695908 u (per nucleus)Nuclear binding energy:1130.55045613 MeV (per nucleus)
7.85104483 MeV (average binding energy per nucleon)Half-life:1.9 μsDecay constant λ:364814.30555787 s^-1Specific activity α:1.536337857195 × 10⁺²⁷ Bq g^-1
4.152264478906 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)(10+)Year of discovery:2005

Radioactive Decay

Half-life T_½ = 1.9 μs respectively 1.9 × 10^-6 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
p	¹⁴³Er	> 0 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 144) with Thulium-144. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 75	Isobar A = 144
42	¹¹⁷Mo
43	¹¹⁸Tc
44	¹¹⁹Ru
45	¹²⁰Rh
46	¹²¹Pd
47	¹²²Ag
48	¹²³Cd
49	¹²⁴In
50	¹²⁵Sn
51	¹²⁶Sb
52	¹²⁷Te
53	¹²⁸I	¹⁴⁴I
54	¹²⁹Xe	¹⁴⁴Xe
55	¹³⁰Cs	¹⁴⁴Cs
56	¹³¹Ba	¹⁴⁴Ba
57	¹³²La	¹⁴⁴La
58	¹³³Ce	¹⁴⁴Ce
59	¹³⁴Pr	¹⁴⁴Pr
60	¹³⁵Nd	¹⁴⁴Nd
61	¹³⁶Pm	¹⁴⁴Pm
62	¹³⁷Sm	¹⁴⁴Sm
63	¹³⁸Eu	¹⁴⁴Eu
64	¹³⁹Gd	¹⁴⁴Gd
65	¹⁴⁰Tb	¹⁴⁴Tb
66	¹⁴¹Dy	¹⁴⁴Dy
67	¹⁴²Ho	¹⁴⁴Ho
68	¹⁴³Er	¹⁴⁴Er
69	¹⁴⁴Tm	¹⁴⁴Tm