Platinum-173

Properties and data of the isotope ¹⁷³Pt.

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-173; Pt-173Symbol:¹⁷³Pt or 17378PtMass number A:173 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:95Isotopic mass:172.97644(6) u (atomic weight of Platinum-173)Nuclide mass:172.9336553 u (calculated nuclear mass without electrons)Mass excess:-21.946 MeVMass defect:1.457079516 u (per nucleus)Nuclear binding energy:1357.26082668 MeV (per nucleus)
7.8454383 MeV (average binding energy per nucleon)Separation energy:S_N = 8.91(6) MeV (first neutron)
S_P = 1.85(6) MeV (first proton)Half-life:382(2) msDecay constant λ:1.8145214150784 s^-1Specific activity α:6.353083462194 × 10⁺²¹ Bq g^-1
171704958437.68 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Year of discovery:1966

Radioactive Decay

Half-life T_½ = 382(2) ms respectively 3.82 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁹Os	86(4) %	6.35(5) MeV
EC/β⁺	¹⁷³Ir	16(6) %	8.33(6) MeV

Parent Nuclides

Direct parent isotope is: ¹⁷⁷Hg.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 95) and isobaric (same nucleon number A = 173) with Platinum-173. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 95	Isobar A = 173
55	¹⁵⁰Cs
56	¹⁵¹Ba
57	¹⁵²La
58	¹⁵³Ce
59	¹⁵⁴Pr
60	¹⁵⁵Nd
61	¹⁵⁶Pm
62	¹⁵⁷Sm
63	¹⁵⁸Eu
64	¹⁵⁹Gd
65	¹⁶⁰Tb
66	¹⁶¹Dy	¹⁷³Dy
67	¹⁶²Ho	¹⁷³Ho
68	¹⁶³Er	¹⁷³Er
69	¹⁶⁴Tm	¹⁷³Tm
70	¹⁶⁵Yb	¹⁷³Yb
71	¹⁶⁶Lu	¹⁷³Lu
72	¹⁶⁷Hf	¹⁷³Hf
73	¹⁶⁸Ta	¹⁷³Ta
74	¹⁶⁹W	¹⁷³W
75	¹⁷⁰Re	¹⁷³Re
76	¹⁷¹Os	¹⁷³Os
77	¹⁷²Ir	¹⁷³Ir
78	¹⁷³Pt	¹⁷³Pt
79	¹⁷⁴Au	¹⁷³Au
80	¹⁷⁵Hg	¹⁷³Hg
81	¹⁷⁶Tl