See also: List of individual Germanium isotopes (and general data sources).
General data
Name of the isotope:Germanium-85; Ge-85Symbol:85Ge or 8532GeMass number A:85 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:53Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.65625 (= neutron-proton ratio)Neutron excess (N-Z):21Isotopic mass:84.942970(4) u (atomic weight of Germanium-85)Nuclide mass:84.925416 u (calculated nuclear mass without electrons)Mass excess:-53.1231 MeVMass defect:0.76667157200001 u (per nucleus)Nuclear binding energy:714.14996929 MeV (per nucleus) 8.40176434 MeV (average binding energy per nucleon)Separation energy:SN = 3.046(5) MeV (first neutron) SP = 16.32(20) MeV (first proton)Half-life:503(18) msDecay constant λ:1.3780262038965 s-1Specific activity α:9.769693443534 × 10+21 Bq g-1 264045768744.17 Ci g-1Spin and parity: (nuclear angular momentum)(3/2+.5/2+)Year of discovery:1991
Radioactive Decay
Half-life T½ = 503(18) ms respectively 5.03 × 10-1 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
β-
85As
83.5 %
10.066(5) MeV
β-, n
84As
16.5(23) %
4.659(5) MeV
β-, 2n
83As
?
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 53) and isobaric (same nucleon number A = 85) with Germanium-85. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
