Holmium-170

Properties and data of the isotope ¹⁷⁰Ho.

Content

General data

Name of the isotope:Holmium-170; Ho-170Symbol:¹⁷⁰Ho or 17067HoMass number A:170 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:103Isotopic mass:169.93963(5) u (atomic weight of Holmium-170)Nuclide mass:169.9028783 u (calculated nuclear mass without electrons)Mass excess:-56.23429 MeVMass defect:1.477133492 u (per nucleus)Nuclear binding energy:1375.940985 MeV (per nucleus)
8.0937705 MeV (average binding energy per nucleon)Separation energy:S_N = 5.51(5) MeV (first neutron)
S_P = 7.93(30) MeV (first proton)Half-life:2.76(5) minDecay constant λ:0.0041856713801929 s^-1Specific activity α:1.491520866563 × 10⁺¹⁹ Bq g^-1
403113747.71995 Ci g^-1Spin and parity:
(nuclear angular momentum)(6+)Year of discovery:1960

Radioactive Decay

Half-life T_½ = 2.76(5) min (minutes) respectively 1.656 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁷⁰Er	100 %	3.87(5) MeV

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
^170mHo	120(70) keV	43(2) s	(1+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 103) and isobaric (same nucleon number A = 170) with Holmium-170. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 103	Isobar A = 170
60	¹⁶³Nd
62	¹⁶⁵Sm
63	¹⁶⁶Eu
64	¹⁶⁷Gd	¹⁷⁰Gd
65	¹⁶⁸Tb	¹⁷⁰Tb
66	¹⁶⁹Dy	¹⁷⁰Dy
67	¹⁷⁰Ho	¹⁷⁰Ho
68	¹⁷¹Er	¹⁷⁰Er
69	¹⁷²Tm	¹⁷⁰Tm
70	¹⁷³Yb	¹⁷⁰Yb
71	¹⁷⁴Lu	¹⁷⁰Lu
72	¹⁷⁵Hf	¹⁷⁰Hf
73	¹⁷⁶Ta	¹⁷⁰Ta
74	¹⁷⁷W	¹⁷⁰W
75	¹⁷⁸Re	¹⁷⁰Re
76	¹⁷⁹Os	¹⁷⁰Os
77	¹⁸⁰Ir	¹⁷⁰Ir
78	¹⁸¹Pt	¹⁷⁰Pt
79	¹⁸²Au	¹⁷⁰Au
80	¹⁸³Hg
81	¹⁸⁴Tl
82	¹⁸⁵Pb
83	¹⁸⁶Bi
84	¹⁸⁷Po