Lead-182

Properties and data of the isotope ¹⁸²Pb.

Contents

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

General data

Name of the isotope:Lead-182; Pb-182Symbol:¹⁸²Pb or 18282PbMass number A:182 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:100Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.219512195122 (= neutron-proton ratio)Neutron excess (N-Z):18Isotopic mass:181.992673(13) u (atomic weight of Lead-182)Nuclide mass:181.9476946 u (calculated nuclear mass without electrons)Mass excess:-6.82506 MeVMass defect:1.515471224 u (per nucleus)Nuclear binding energy:1411.65235233 MeV (per nucleus)
7.75633161 MeV (average binding energy per nucleon)Separation energy:S_N = 11.78(8) MeV (first neutron)
S_P = 1.315(15) MeV (first proton)Half-life:55(5) msDecay constant λ:12.602676010181 s^-1Specific activity α:4.193098903063 × 10⁺²² Bq g^-1
1133269973801 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.3788(35) femtometer fmYear of discovery:1986

Radioactive Decay

Half-life T_½ = 55(5) ms respectively 5.5 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁷⁸Hg	98 %	7.066(6) MeV
β⁺	¹⁸²Tl	2 %	6.503(17) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 100) and isobaric (same nucleon number A = 182) with Lead-182. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 100	Isobar A = 182
58	¹⁵⁸Ce
59	¹⁵⁹Pr
60	¹⁶⁰Nd
61	¹⁶¹Pm
62	¹⁶²Sm
63	¹⁶³Eu
64	¹⁶⁴Gd
65	¹⁶⁵Tb
66	¹⁶⁶Dy
67	¹⁶⁷Ho
68	¹⁶⁸Er
69	¹⁶⁹Tm
70	¹⁷⁰Yb	¹⁸²Yb
71	¹⁷¹Lu	¹⁸²Lu
72	¹⁷²Hf	¹⁸²Hf
73	¹⁷³Ta	¹⁸²Ta
74	¹⁷⁴W	¹⁸²W
75	¹⁷⁵Re	¹⁸²Re
76	¹⁷⁶Os	¹⁸²Os
77	¹⁷⁷Ir	¹⁸²Ir
78	¹⁷⁸Pt	¹⁸²Pt
79	¹⁷⁹Au	¹⁸²Au
80	¹⁸⁰Hg	¹⁸²Hg
81	¹⁸¹Tl	¹⁸²Tl
82	¹⁸²Pb	¹⁸²Pb