Thulium-152

Properties and data of the isotope ¹⁵²Tm.

Contents

General data

Name of the isotope:Thulium-152; Tm-152Symbol:¹⁵²Tm or 15269TmMass number A:152 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:83Isotopic mass:151.94448(6) u (atomic weight of Thulium-152)Nuclide mass:151.9066314 u (calculated nuclear mass without electrons)Mass excess:-51.71655 MeVMass defect:1.314635236 u (per nucleus)Nuclear binding energy:1224.57483452 MeV (per nucleus)
8.05641339 MeV (average binding energy per nucleon)Separation energy:S_N = 9.02(6) MeV (first neutron)
S_P = 0.74(6) MeV (first proton)Half-life:8.0(10) sDecay constant λ:0.086643397569993 s^-1Specific activity α:3.455488375827 × 10⁺²⁰ Bq g^-1
9339157772.5076 Ci g^-1Spin and parity:
(nuclear angular momentum)(2)-Year of discovery:1980

Radioactive Decay

Half-life T_½ = 8.0(10) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁵²Er	100 %	8.78(5) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁵²Yb, ¹⁵⁶Lu.

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
^152m1Tm	+x keV	5.2(6) s	(9)+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 152) with Thulium-152. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 83	Isobar A = 152
46	¹²⁹Pd
47	¹³⁰Ag
48	¹³¹Cd
49	¹³²In
50	¹³³Sn
51	¹³⁴Sb
52	¹³⁵Te
53	¹³⁶I
54	¹³⁷Xe
55	¹³⁸Cs
56	¹³⁹Ba	¹⁵²Ba
57	¹⁴⁰La	¹⁵²La
58	¹⁴¹Ce	¹⁵²Ce
59	¹⁴²Pr	¹⁵²Pr
60	¹⁴³Nd	¹⁵²Nd
61	¹⁴⁴Pm	¹⁵²Pm
62	¹⁴⁵Sm	¹⁵²Sm
63	¹⁴⁶Eu	¹⁵²Eu
64	¹⁴⁷Gd	¹⁵²Gd
65	¹⁴⁸Tb	¹⁵²Tb
66	¹⁴⁹Dy	¹⁵²Dy
67	¹⁵⁰Ho	¹⁵²Ho
68	¹⁵¹Er	¹⁵²Er
69	¹⁵²Tm	¹⁵²Tm
70	¹⁵³Yb	¹⁵²Yb
71	¹⁵⁴Lu	¹⁵²Lu
72	¹⁵⁵Hf
73	¹⁵⁶Ta
74	¹⁵⁷W