Thulium-153m

Properties and data of the isotope ^153mTm.

Contents

General data

Name of the isotope:Thulium-153m; Tm-153mSymbol:^153mTm or 153m69TmMass number A:153 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:84Isotopic mass:152.942057(13) u (atomic weight of Thulium-153m)
Excitation energy: 43.2(2) keVNuclide mass:152.9042084 u (calculated nuclear mass without electrons)Mass excess:-53.97356 MeVMass defect:1.325723152 u (per nucleus)Nuclear binding energy:1234.90316175 MeV (per nucleus)
8.0712625 MeV (average binding energy per nucleon)Half-life:2.5(2) sDecay constant λ:0.27725887222398 s^-1Specific activity α:1.098481567894 × 10⁺²¹ Bq g^-1
29688691024.181 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)

Radioactive Decay

Half-life T_½ = 2.5(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁵³Er	8(3) %
α	¹⁴⁹Ho	92(3) %

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
¹⁵³Tm		1.48(1) s	(11/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 84) and isobaric (same nucleon number A = 153) with Thulium-153m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 84	Isobar A = 153
47	¹³¹Ag
48	¹³²Cd
49	¹³³In
50	¹³⁴Sn
51	¹³⁵Sb
52	¹³⁶Te
53	¹³⁷I
54	¹³⁸Xe
55	¹³⁹Cs
56	¹⁴⁰Ba	¹⁵³Ba
57	¹⁴¹La	¹⁵³La
58	¹⁴²Ce	¹⁵³Ce
59	¹⁴³Pr	¹⁵³Pr
60	¹⁴⁴Nd	¹⁵³Nd
61	¹⁴⁵Pm	¹⁵³Pm
62	¹⁴⁶Sm	¹⁵³Sm
63	¹⁴⁷Eu	¹⁵³Eu
64	¹⁴⁸Gd	¹⁵³Gd
65	¹⁴⁹Tb	¹⁵³Tb
66	¹⁵⁰Dy	¹⁵³Dy
67	¹⁵¹Ho	¹⁵³Ho
68	¹⁵²Er	¹⁵³Er
69	¹⁵³Tm	¹⁵³Tm
70	¹⁵⁴Yb	¹⁵³Yb
71	¹⁵⁵Lu	¹⁵³Lu
72	¹⁵⁶Hf	¹⁵³Hf
73	¹⁵⁷Ta
74	¹⁵⁸W
75	¹⁵⁹Re
76	¹⁶⁰Os