Dysprosium-169

Properties and data of the isotope ¹⁶⁹Dy.

Contents

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

General data

Name of the isotope:Dysprosium-169; Dy-169Symbol:¹⁶⁹Dy or 16966DyMass number A:169 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:103Isotopic mass:168.94031(32) u (atomic weight of Dysprosium-169)Nuclide mass:168.9041068 u (calculated nuclear mass without electrons)Mass excess:-55.60088 MeVMass defect:1.46862846 u (per nucleus)Nuclear binding energy:1368.01859872 MeV (per nucleus)
8.09478461 MeV (average binding energy per nucleon)Separation energy:S_N = 5.11(33) MeV (first neutron)
S_P = 10.16(42) MeV (first proton)Half-life:39(8) sDecay constant λ:0.017773004629742 s^-1Specific activity α:6.370924844322 × 10⁺¹⁹ Bq g^-1
1721871579.5466 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2)-Year of discovery:1990

Radioactive Decay

Half-life T_½ = 39(8) s respectively 3.9 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶⁹Ho	100 %	3.2(3) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 103) and isobaric (same nucleon number A = 169) with Dysprosium-169. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 103	Isobar A = 169
60	¹⁶³Nd
62	¹⁶⁵Sm
63	¹⁶⁶Eu
64	¹⁶⁷Gd	¹⁶⁹Gd
65	¹⁶⁸Tb	¹⁶⁹Tb
66	¹⁶⁹Dy	¹⁶⁹Dy
67	¹⁷⁰Ho	¹⁶⁹Ho
68	¹⁷¹Er	¹⁶⁹Er
69	¹⁷²Tm	¹⁶⁹Tm
70	¹⁷³Yb	¹⁶⁹Yb
71	¹⁷⁴Lu	¹⁶⁹Lu
72	¹⁷⁵Hf	¹⁶⁹Hf
73	¹⁷⁶Ta	¹⁶⁹Ta
74	¹⁷⁷W	¹⁶⁹W
75	¹⁷⁸Re	¹⁶⁹Re
76	¹⁷⁹Os	¹⁶⁹Os
77	¹⁸⁰Ir	¹⁶⁹Ir
78	¹⁸¹Pt	¹⁶⁹Pt
79	¹⁸²Au
80	¹⁸³Hg
81	¹⁸⁴Tl
82	¹⁸⁵Pb
83	¹⁸⁶Bi
84	¹⁸⁷Po
85	¹⁸⁸At