Dysprosium-172

Properties and data of the isotope ¹⁷²Dy.

Content

General data

Name of the isotope:Dysprosium-172; Dy-172Symbol:¹⁷²Dy or 17266DyMass number A:172 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:106Isotopic mass:171.94846(32) u (atomic weight of Dysprosium-172)Nuclide mass:171.9122568 u (calculated nuclear mass without electrons)Mass excess:-48.0092 MeVMass defect:1.486473208 u (per nucleus)Nuclear binding energy:1384.64087441 MeV (per nucleus)
8.05023764 MeV (average binding energy per nucleon)Separation energy:S_N = 5.89(42) MeV (first neutron)
S_P = 11.27(58) MeV (first proton)Half-life:160 nsDecay constant λ:4332169.8784997 s^-1Specific activity α:1.525668844298 × 10⁺²⁸ Bq g^-1
4.123429308914 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2012

Radioactive Decay

Half-life T_½ = 160 ns respectively 1.60 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁷²Ho	100 %	3.47(36) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 172) with Dysprosium-172. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 106	Isobar A = 172
64	¹⁷⁰Gd
65	¹⁷¹Tb	¹⁷²Tb
66	¹⁷²Dy	¹⁷²Dy
67	¹⁷³Ho	¹⁷²Ho
68	¹⁷⁴Er	¹⁷²Er
69	¹⁷⁵Tm	¹⁷²Tm
70	¹⁷⁶Yb	¹⁷²Yb
71	¹⁷⁷Lu	¹⁷²Lu
72	¹⁷⁸Hf	¹⁷²Hf
73	¹⁷⁹Ta	¹⁷²Ta
74	¹⁸⁰W	¹⁷²W
75	¹⁸¹Re	¹⁷²Re
76	¹⁸²Os	¹⁷²Os
77	¹⁸³Ir	¹⁷²Ir
78	¹⁸⁴Pt	¹⁷²Pt
79	¹⁸⁵Au	¹⁷²Au
80	¹⁸⁶Hg	¹⁷²Hg
81	¹⁸⁷Tl
82	¹⁸⁸Pb
83	¹⁸⁹Bi
84	¹⁹⁰Po
85	¹⁹¹At