Platinum-184

Properties and data of the isotope ¹⁸⁴Pt.

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-184; Pt-184Symbol:¹⁸⁴Pt or 18478PtMass number A:184 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:106Isotopic mass:183.959920(17) u (atomic weight of Platinum-184)Nuclide mass:183.9171353 u (calculated nuclear mass without electrons)Mass excess:-37.33428 MeVMass defect:1.568913592 u (per nucleus)Nuclear binding energy:1461.43359747 MeV (per nucleus)
7.9425739 MeV (average binding energy per nucleon)Separation energy:S_N = 9.633(22) MeV (first neutron)
S_P = 4.420(29) MeV (first proton)Half-life:17.3(2) minDecay constant λ:0.00066777185025043 s^-1Specific activity α:2.197495160933 × 10⁺¹⁸ Bq g^-1
59391761.106316 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4015(36) femtometer fmYear of discovery:1963

Radioactive Decay

Half-life T_½ = 17.3(2) min (minutes) respectively 1.038 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸⁰Os	ca. 0.001 %	4.599(8) MeV
EC/β⁺	¹⁸⁴Ir	99.999 %	2.28(3) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁸⁸Hg, ¹⁸⁴Au.

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
^184mPt	1840.3(8) keV	1.01(5) ms	8-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 184) with Platinum-184. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 106	Isobar A = 184
64	¹⁷⁰Gd
65	¹⁷¹Tb
66	¹⁷²Dy
67	¹⁷³Ho
68	¹⁷⁴Er
69	¹⁷⁵Tm
70	¹⁷⁶Yb	¹⁸⁴Yb
71	¹⁷⁷Lu	¹⁸⁴Lu
72	¹⁷⁸Hf	¹⁸⁴Hf
73	¹⁷⁹Ta	¹⁸⁴Ta
74	¹⁸⁰W	¹⁸⁴W
75	¹⁸¹Re	¹⁸⁴Re
76	¹⁸²Os	¹⁸⁴Os
77	¹⁸³Ir	¹⁸⁴Ir
78	¹⁸⁴Pt	¹⁸⁴Pt
79	¹⁸⁵Au	¹⁸⁴Au
80	¹⁸⁶Hg	¹⁸⁴Hg
81	¹⁸⁷Tl	¹⁸⁴Tl
82	¹⁸⁸Pb	¹⁸⁴Pb
83	¹⁸⁹Bi	¹⁸⁴Bi
84	¹⁹⁰Po
85	¹⁹¹At