Gold-170m

Properties and data of the isotope ¹⁷⁰Au.

Content

General data

Name of the isotope:Gold-170m; Au-170mSymbol:¹⁷⁰Au or 17079AuMass number A:170 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:91Isotopic mass:169.99597(21) u (atomic weight of Gold-170m)
Excitation energy: 285(13) keVNuclide mass:169.9526369 u (calculated nuclear mass without electrons)Mass excess:-3.75392 MeVMass defect:1.410714884 u (per nucleus)Nuclear binding energy:1314.07245016 MeV (per nucleus)
7.72983794 MeV (average binding energy per nucleon)Half-life:0.62 msDecay constant λ:1.1179793234838 s^-1Specific activity α:3.983804121015 × 10⁺²¹ Bq g^-1
107670381649.07 Ci g^-1Spin and parity:
(nuclear angular momentum)(9+)

Radioactive Decay

Half-life T_½ = 0.62 ms respectively 6.2 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁶Ir	42(5) %
p	¹⁶⁹Pt	58(5) %

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹⁷⁰Au		0.29 ms	(2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 170) with Gold-170m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 91	Isobar A = 170
52	¹⁴³Te
53	¹⁴⁴I
54	¹⁴⁵Xe
55	¹⁴⁶Cs
56	¹⁴⁷Ba
57	¹⁴⁸La
58	¹⁴⁹Ce
59	¹⁵⁰Pr
60	¹⁵¹Nd
61	¹⁵²Pm
62	¹⁵³Sm
63	¹⁵⁴Eu
64	¹⁵⁵Gd	¹⁷⁰Gd
65	¹⁵⁶Tb	¹⁷⁰Tb
66	¹⁵⁷Dy	¹⁷⁰Dy
67	¹⁵⁸Ho	¹⁷⁰Ho
68	¹⁵⁹Er	¹⁷⁰Er
69	¹⁶⁰Tm	¹⁷⁰Tm
70	¹⁶¹Yb	¹⁷⁰Yb
71	¹⁶²Lu	¹⁷⁰Lu
72	¹⁶³Hf	¹⁷⁰Hf
73	¹⁶⁴Ta	¹⁷⁰Ta
74	¹⁶⁵W	¹⁷⁰W
75	¹⁶⁶Re	¹⁷⁰Re
76	¹⁶⁷Os	¹⁷⁰Os
77	¹⁶⁸Ir	¹⁷⁰Ir
78	¹⁶⁹Pt	¹⁷⁰Pt
79	¹⁷⁰Au	¹⁷⁰Au
80	¹⁷¹Hg