Thulium-148

Properties and data of the isotope ¹⁴⁸Tm.

Contents

General data

Name of the isotope:Thulium-148; Tm-148Symbol:¹⁴⁸Tm or 14869TmMass number A:148 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:79Isotopic mass:147.958384(11) u (atomic weight of Thulium-148)
Excitation energy: +x keVNuclide mass:147.9205354 u (calculated nuclear mass without electrons)Mass excess:-38.76505 MeVMass defect:1.266071572 u (per nucleus)Nuclear binding energy:1179.33807289 MeV (per nucleus)
7.96850049 MeV (average binding energy per nucleon)Separation energy:S_N = 10.862(12) MeV (first neutron)Half-life:0.7(2) sDecay constant λ:0.99021025794278 s^-1Specific activity α:4.056588880466 × 10⁺²¹ Bq g^-1
109637537309.91 Ci g^-1Spin and parity:
(nuclear angular momentum)(10+)Year of discovery:1982

Radioactive Decay

Half-life T_½ = 0.7(2) s respectively 7 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴⁸Er	100 %	12.714(14) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 148) with Thulium-148. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 79	Isobar A = 148
44	¹²³Ru
45	¹²⁴Rh
46	¹²⁵Pd
47	¹²⁶Ag
48	¹²⁷Cd
49	¹²⁸In
50	¹²⁹Sn
51	¹³⁰Sb
52	¹³¹Te
53	¹³²I
54	¹³³Xe	¹⁴⁸Xe
55	¹³⁴Cs	¹⁴⁸Cs
56	¹³⁵Ba	¹⁴⁸Ba
57	¹³⁶La	¹⁴⁸La
58	¹³⁷Ce	¹⁴⁸Ce
59	¹³⁸Pr	¹⁴⁸Pr
60	¹³⁹Nd	¹⁴⁸Nd
61	¹⁴⁰Pm	¹⁴⁸Pm
62	¹⁴¹Sm	¹⁴⁸Sm
63	¹⁴²Eu	¹⁴⁸Eu
64	¹⁴³Gd	¹⁴⁸Gd
65	¹⁴⁴Tb	¹⁴⁸Tb
66	¹⁴⁵Dy	¹⁴⁸Dy
67	¹⁴⁶Ho	¹⁴⁸Ho
68	¹⁴⁷Er	¹⁴⁸Er
69	¹⁴⁸Tm	¹⁴⁸Tm
70	¹⁴⁹Yb	¹⁴⁸Yb
71	¹⁵⁰Lu