Gold-206

Properties and data of the isotope ²⁰⁶Au.

Content

General data

Name of the isotope:Gold-206; Au-206Symbol:²⁰⁶Au or 20679AuMass number A:206 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:127Isotopic mass:205.98474(32) u (atomic weight of Gold-206)Nuclide mass:205.9414069 u (calculated nuclear mass without electrons)Mass excess:-14.2146 MeVMass defect:1.73388186 u (per nucleus)Nuclear binding energy:1615.1005493 MeV (per nucleus)
7.84029393 MeV (average binding energy per nucleon)Separation energy:S_N = 3.52(36) MeV (first neutron)
S_P = 8.54(42) MeV (first proton)Half-life:40(15) sDecay constant λ:0.017328679513999 s^-1Specific activity α:5.090524339024 × 10⁺¹⁹ Bq g^-1
1375817388.9255 Ci g^-1Spin and parity:
(nuclear angular momentum)5+.6+Year of discovery:2009

Radioactive Decay

Half-life T_½ = 40(15) s respectively 4.0 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁰⁶Hg	100 %	6.73(30) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 127) and isobaric (same nucleon number A = 206) with Gold-206. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 127	Isobar A = 206
76	²⁰³Os
77	²⁰⁴Ir
78	²⁰⁵Pt	²⁰⁶Pt
79	²⁰⁶Au	²⁰⁶Au
80	²⁰⁷Hg	²⁰⁶Hg
81	²⁰⁸Tl	²⁰⁶Tl
82	²⁰⁹Pb	²⁰⁶Pb
83	²¹⁰Bi	²⁰⁶Bi
84	²¹¹Po	²⁰⁶Po
85	²¹²At	²⁰⁶At
86	²¹³Rn	²⁰⁶Rn
87	²¹⁴Fr	²⁰⁶Fr
88	²¹⁵Ra	²⁰⁶Ra
89	²¹⁶Ac	²⁰⁶Ac
90	²¹⁷Th
91	²¹⁸Pa
92	²¹⁹U