Osmium-170

Properties and data of the isotope ¹⁷⁰Os.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Osmium isotopes (and general data sources).

General data

Name of the isotope:Osmium-170; Os-170Symbol:¹⁷⁰Os or 17076OsMass number A:170 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:94Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2368421052632 (= neutron-proton ratio)Neutron excess (N-Z):18Isotopic mass:169.963579(10) u (atomic weight of Osmium-170)Nuclide mass:169.9218912 u (calculated nuclear mass without electrons)Mass excess:-33.92594 MeVMass defect:1.445625536 u (per nucleus)Nuclear binding energy:1346.59151303 MeV (per nucleus)
7.92112655 MeV (average binding energy per nucleon)Separation energy:S_N = 11.275(27) MeV (first neutron)
S_P = 2.806(15) MeV (first proton)Half-life:7.37(18) sDecay constant λ:0.094049820971499 s^-1Specific activity α:3.35136846001 × 10⁺²⁰ Bq g^-1
9057752594.6297 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1972

Radioactive Decay

Half-life T_½ = 7.37(18) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁶W	9.5(10) %	5.5369(27) MeV
EC/β⁺	¹⁷⁰Re	90.5(10) %	4.987(25) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁷⁴Pt, ¹⁷⁰Ir.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 94) and isobaric (same nucleon number A = 170) with Osmium-170. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 94	Isobar A = 170
54	¹⁴⁸Xe
55	¹⁴⁹Cs
56	¹⁵⁰Ba
57	¹⁵¹La
58	¹⁵²Ce
59	¹⁵³Pr
60	¹⁵⁴Nd
61	¹⁵⁵Pm
62	¹⁵⁶Sm
63	¹⁵⁷Eu
64	¹⁵⁸Gd	¹⁷⁰Gd
65	¹⁵⁹Tb	¹⁷⁰Tb
66	¹⁶⁰Dy	¹⁷⁰Dy
67	¹⁶¹Ho	¹⁷⁰Ho
68	¹⁶²Er	¹⁷⁰Er
69	¹⁶³Tm	¹⁷⁰Tm
70	¹⁶⁴Yb	¹⁷⁰Yb
71	¹⁶⁵Lu	¹⁷⁰Lu
72	¹⁶⁶Hf	¹⁷⁰Hf
73	¹⁶⁷Ta	¹⁷⁰Ta
74	¹⁶⁸W	¹⁷⁰W
75	¹⁶⁹Re	¹⁷⁰Re
76	¹⁷⁰Os	¹⁷⁰Os
77	¹⁷¹Ir	¹⁷⁰Ir
78	¹⁷²Pt	¹⁷⁰Pt
79	¹⁷³Au	¹⁷⁰Au
80	¹⁷⁴Hg	¹⁷⁰Hg