See also: List of individual Dysprosium isotopes (and general data sources).
General data
Name of the isotope:Dysprosium-166; Dy-166Symbol:166Dy or 16666DyMass number A:166 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:100Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5151515151515 (= neutron-proton ratio)Neutron excess (N-Z):34Isotopic mass:165.9328125(9) u (atomic weight of Dysprosium-166)Nuclide mass:165.8966093 u (calculated nuclear mass without electrons)Mass excess:-62.58475 MeVMass defect:1.450131212 u (per nucleus)Nuclear binding energy:1350.78852319 MeV (per nucleus) 8.13728026 MeV (average binding energy per nucleon)Separation energy:SN = 7.0435(4) MeV (first neutron) SP = 9.31(10) MeV (first proton)Half-life:81.6(1) hDecay constant λ:2.359569650598 × 10-6 s-1Specific activity α:8.563502513362 × 10+15 Bq g-1 231446.01387467 Ci g-1Spin and parity: (nuclear angular momentum)0+Year of discovery:1949
Radioactive Decay
Half-life T½ = 81.6(1) h (hours) respectively 2.93760 × 105 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
β-
166Ho
100 %
0.4865(9) MeV
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 100) and isobaric (same nucleon number A = 166) with Dysprosium-166. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
