Lead-192

Properties and data of the isotope ¹⁹²Pb.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Lead-192; Pb-192Symbol:¹⁹²Pb or 19282PbMass number A:192 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:110Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3414634146341 (= neutron-proton ratio)Neutron excess (N-Z):28Isotopic mass:191.975785(14) u (atomic weight of Lead-192)Nuclide mass:191.9308066 u (calculated nuclear mass without electrons)Mass excess:-22.55613 MeVMass defect:1.619008384 u (per nucleus)Nuclear binding energy:1508.09659565 MeV (per nucleus)
7.85466977 MeV (average binding energy per nucleon)Separation energy:S_N = 10.40(40) MeV (first neutron)
S_P = 3.562(15) MeV (first proton)Half-life:3.5(1) minDecay constant λ:0.0033007008598093 s^-1Specific activity α:1.040695576664 × 10⁺¹⁹ Bq g^-1
281269074.77411 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4300(25) femtometer fmYear of discovery:1975

Radioactive Decay

Half-life T_½ = 3.5(1) min (minutes) respectively 2.10 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹⁹²Tl	99.9941(7) %	3.32(3) MeV
α	¹⁸⁸Hg	0.0059(7) %	5.221(5) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁹²Bi, ¹⁹⁶Po.

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
^192m1Pb	2581.1(4) keV	166(6) ns	(10)+
^192m2Pb	2624.0(8) keV	1.09(4) μs	(12+)
^192m3Pb	2743.5(4) keV	0.756(14) μs	(11)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 192) with Lead-192. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 110	Isobar A = 192
69	¹⁷⁹Tm
70	¹⁸⁰Yb
71	¹⁸¹Lu
72	¹⁸²Hf
73	¹⁸³Ta	¹⁹²Ta
74	¹⁸⁴W	¹⁹²W
75	¹⁸⁵Re	¹⁹²Re
76	¹⁸⁶Os	¹⁹²Os
77	¹⁸⁷Ir	¹⁹²Ir
78	¹⁸⁸Pt	¹⁹²Pt
79	¹⁸⁹Au	¹⁹²Au
80	¹⁹⁰Hg	¹⁹²Hg
81	¹⁹¹Tl	¹⁹²Tl
82	¹⁹²Pb	¹⁹²Pb
83	¹⁹³Bi	¹⁹²Bi
84	¹⁹⁴Po	¹⁹²Po
85	¹⁹⁵At	¹⁹²At
86	¹⁹⁶Rn