Thulium-151m1

Properties and data of the isotope ^151m1Tm.

Contents

General data

Name of the isotope:Thulium-151m1; Tm-151m1Symbol:^151m1Tm or 151m169TmMass number A:151 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:82Isotopic mass:150.945493(21) u (atomic weight of Thulium-151m1)
Excitation energy: +x keVNuclide mass:150.9076444 u (calculated nuclear mass without electrons)Mass excess:-50.77294 MeVMass defect:1.30495732 u (per nucleus)Nuclear binding energy:1215.55991384 MeV (per nucleus)
8.05006565 MeV (average binding energy per nucleon)Half-life:6.6(20) sDecay constant λ:0.10502230008484 s^-1Specific activity α:4.216393896969 × 10⁺²⁰ Bq g^-1
11395659180.999 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)

Radioactive Decay

Half-life T_½ = 6.6(20) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁵¹Er	100 %

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
¹⁵¹Tm		4.17(11) s	(11/2-)
^151m2Tm	2655.67(22) keV	0.451(34) μs	(27/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 151) with Thulium-151m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 82	Isobar A = 151
45	¹²⁷Rh
46	¹²⁸Pd
47	¹²⁹Ag
48	¹³⁰Cd
49	¹³¹In
50	¹³²Sn
51	¹³³Sb
52	¹³⁴Te
53	¹³⁵I
54	¹³⁶Xe
55	¹³⁷Cs	¹⁵¹Cs
56	¹³⁸Ba	¹⁵¹Ba
57	¹³⁹La	¹⁵¹La
58	¹⁴⁰Ce	¹⁵¹Ce
59	¹⁴¹Pr	¹⁵¹Pr
60	¹⁴²Nd	¹⁵¹Nd
61	¹⁴³Pm	¹⁵¹Pm
62	¹⁴⁴Sm	¹⁵¹Sm
63	¹⁴⁵Eu	¹⁵¹Eu
64	¹⁴⁶Gd	¹⁵¹Gd
65	¹⁴⁷Tb	¹⁵¹Tb
66	¹⁴⁸Dy	¹⁵¹Dy
67	¹⁴⁹Ho	¹⁵¹Ho
68	¹⁵⁰Er	¹⁵¹Er
69	¹⁵¹Tm	¹⁵¹Tm
70	¹⁵²Yb	¹⁵¹Yb
71	¹⁵³Lu	¹⁵¹Lu
72	¹⁵⁴Hf
73	¹⁵⁵Ta
74	¹⁵⁶W