Platinum-184m

Properties and data of the isotope ^184mPt.

Contents

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

General data

Name of the isotope:Platinum-184m; Pt-184mSymbol:^184mPt or 184m78PtMass number A:184 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:106Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3589743589744 (= neutron-proton ratio)Neutron excess (N-Z):28Excitation energy:1840.3(8) keVIsotopic mass:183.959920(17) u (atomic weight of Platinum-184m)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)Half-life:1.01(5) msDecay constant λ:686.28433718806 s^-1Specific activity α:2.258415818860 × 10⁺²⁴ Bq g^-1
61038265374611 Ci g^-1Spin and parity:
(nuclear angular momentum)8-

Radioactive Decay

Half-life T_½ = 1.01(5) ms respectively 1.01 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁸⁴Pt	100 %

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
¹⁸⁴Pt		17.3(2) min	0+

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-184m. 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