Holmium-169

Properties and data of the isotope ¹⁶⁹Ho.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Holmium isotopes (and general data sources).

General data

Name of the isotope:Holmium-169; Ho-169Symbol:¹⁶⁹Ho or 16967HoMass number A:169 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:102Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.5223880597015 (= neutron-proton ratio)Neutron excess (N-Z):35Isotopic mass:168.936879(22) u (atomic weight of Holmium-169)Nuclide mass:168.9001273 u (calculated nuclear mass without electrons)Mass excess:-58.79683 MeVMass defect:1.471219576 u (per nucleus)Nuclear binding energy:1370.43220773 MeV (per nucleus)
8.10906632 MeV (average binding energy per nucleon)Separation energy:S_N = 6.81(4) MeV (first neutron)
S_P = 7.53(14) MeV (first proton)Half-life:4.72(10) minDecay constant λ:0.0024475536036721 s^-1Specific activity α:8.77351938307 × 10⁺¹⁸ Bq g^-1
237122145.48841 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2-Year of discovery:1963

Radioactive Decay

Half-life T_½ = 4.72(10) min (minutes) respectively 2.832 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶⁹Er	100 %	2.126(2) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶⁹Dy.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 102) and isobaric (same nucleon number A = 169) with Holmium-169. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 102	Isobar A = 169
60	¹⁶²Nd
61	¹⁶³Pm
62	¹⁶⁴Sm
63	¹⁶⁵Eu
64	¹⁶⁶Gd	¹⁶⁹Gd
65	¹⁶⁷Tb	¹⁶⁹Tb
66	¹⁶⁸Dy	¹⁶⁹Dy
67	¹⁶⁹Ho	¹⁶⁹Ho
68	¹⁷⁰Er	¹⁶⁹Er
69	¹⁷¹Tm	¹⁶⁹Tm
70	¹⁷²Yb	¹⁶⁹Yb
71	¹⁷³Lu	¹⁶⁹Lu
72	¹⁷⁴Hf	¹⁶⁹Hf
73	¹⁷⁵Ta	¹⁶⁹Ta
74	¹⁷⁶W	¹⁶⁹W
75	¹⁷⁷Re	¹⁶⁹Re
76	¹⁷⁸Os	¹⁶⁹Os
77	¹⁷⁹Ir	¹⁶⁹Ir
78	¹⁸⁰Pt	¹⁶⁹Pt
79	¹⁸¹Au
80	¹⁸²Hg
81	¹⁸³Tl
82	¹⁸⁴Pb
83	¹⁸⁵Bi
84	¹⁸⁶Po