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Platinum-177

Properties and data of the isotope 177Pt.

Contents
General Data
Radioactive Decay
Parent Nuclides
Isotones und Isobares

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

 

General data

Name of the isotope:Platinum-177; Pt-177Symbol:177Pt or 17778PtMass number A:177 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:99Isotopic mass:176.968470(16) u (atomic weight of Platinum-177)Nuclide mass:176.9256853 u (calculated nuclear mass without electrons)Mass excess:-29.37001 MeVMass defect:1.49970918 u (per nucleus)Nuclear binding energy:1396.97010291 MeV (per nucleus)
7.89248646 MeV (average binding energy per nucleon)Separation energy:SN = 8.508(20) MeV (first neutron)
SP = 2.781(22) MeV (first proton)Half-life:10.0(4) sDecay constant λ:0.069314718055995 s-1Specific activity α:2.371721567045 × 10+20 Bq g-1
6410058289.3122 Ci g-1Spin and parity:
(nuclear angular momentum)5/2-Year of discovery:1966

 

Radioactive Decay

Half-life T½ = 10.0(4) s respectively 1.0 × 101 seconds s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
α173Os5.7(5) %5.6429(27) MeV
EC/β+177Ir94.3(5) %6.677(25) MeV

 

Parent Nuclides

Direct parent isotope is: 181Hg.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
177mPt147.5(4) keV2.2(3) μs1/2-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 177) with Platinum-177. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 99Isobar A = 177
57156La
58157Ce
59158Pr
60159Nd
61160Pm
62161Sm
63162Eu
64163Gd
65164Tb
66165Dy
67166Ho
68167Er177Er
69168Tm177Tm
70169Yb177Yb
71170Lu177Lu
72171Hf177Hf
73172Ta177Ta
74173W177W
75174Re177Re
76175Os177Os
77176Ir177Ir
78177Pt177Pt
79178Au177Au
80179Hg177Hg
81180Tl177Tl
82181Pb

 

External data and identifiers

Adopted Levels, Gammas:NuDat 177Pt

 

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Last update: 2020-10-21

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