Lead-190

Properties and data of the isotope ¹⁹⁰Pb.

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-190; Pb-190Symbol:¹⁹⁰Pb or 19082PbMass number A:190 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:108Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3170731707317 (= neutron-proton ratio)Neutron excess (N-Z):26Isotopic mass:189.978082(13) u (atomic weight of Lead-190)Nuclide mass:189.9331036 u (calculated nuclear mass without electrons)Mass excess:-20.41649 MeVMass defect:1.599381552 u (per nucleus)Nuclear binding energy:1489.8143194 MeV (per nucleus)
7.841128 MeV (average binding energy per nucleon)Separation energy:S_N = 10.644(19) MeV (first neutron)
S_P = 3.090(15) MeV (first proton)Half-life:71(1) sDecay constant λ:0.0097626363459147 s^-1Specific activity α:3.110686308964 × 10⁺¹⁹ Bq g^-1
840726029.44997 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4222(23) femtometer fmYear of discovery:1972

Radioactive Decay

Half-life T_½ = 71(1) s respectively 7.1 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹⁹⁰Tl	99.60(4) %	3.955(15) MeV
α	¹⁸⁶Hg	0.40(4) %	5.698(5) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁹⁰Bi, ¹⁹⁴Po.

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
^190m1Pb	2614.8(8) keV	150 ns	(10)+
^190m2Pb	2616+x keV	25 μs	(12+)
^190m3Pb	2658.2(8) keV	7.2(6) μs	(11)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 190) with Lead-190. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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