Platinum-186

Properties and data of the isotope ¹⁸⁶Pt.

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-186; Pt-186Symbol:¹⁸⁶Pt or 18678PtMass number A:186 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:108Isotopic mass:185.959351(23) u (atomic weight of Platinum-186)Nuclide mass:185.9165663 u (calculated nuclear mass without electrons)Mass excess:-37.8643 MeVMass defect:1.586812424 u (per nucleus)Nuclear binding energy:1478.10625208 MeV (per nucleus)
7.94680781 MeV (average binding energy per nucleon)Separation energy:S_N = 9.25(3) MeV (first neutron)
S_P = 4.82(4) MeV (first proton)Half-life:2.08(5) hDecay constant λ:9.256773244657 × 10^-5 s^-1Specific activity α:3.013275264206 × 10⁺¹⁷ Bq g^-1
8143987.2005581 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4037(36) femtometer fmYear of discovery:1961

Radioactive Decay

Half-life T_½ = 2.08(5) h (hours) respectively 7.488 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁸⁶Ir	99.99986 %	1.308(27) MeV
α	¹⁸²Os	0.00014 %	4.320(18) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸⁶Au.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 186) with Platinum-186. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 108	Isobar A = 186
66	¹⁷⁴Dy
67	¹⁷⁵Ho
68	¹⁷⁶Er
69	¹⁷⁷Tm
70	¹⁷⁸Yb
71	¹⁷⁹Lu	¹⁸⁶Lu
72	¹⁸⁰Hf	¹⁸⁶Hf
73	¹⁸¹Ta	¹⁸⁶Ta
74	¹⁸²W	¹⁸⁶W
75	¹⁸³Re	¹⁸⁶Re
76	¹⁸⁴Os	¹⁸⁶Os
77	¹⁸⁵Ir	¹⁸⁶Ir
78	¹⁸⁶Pt	¹⁸⁶Pt
79	¹⁸⁷Au	¹⁸⁶Au
80	¹⁸⁸Hg	¹⁸⁶Hg
81	¹⁸⁹Tl	¹⁸⁶Tl
82	¹⁹⁰Pb	¹⁸⁶Pb
83	¹⁹¹Bi	¹⁸⁶Bi
84	¹⁹²Po	¹⁸⁶Po
85	¹⁹³At
86	¹⁹⁴Rn