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Lead-204

Properties and data of the isotope 204Pb.

Contents
General Data
Radioactive Decay
Parent Nuclides
Isotones und Isobares

See also: list of Lead isotopes.

 

General data

Name of the isotope:Lead-204; Pb-204Symbol:204Pb or 20482PbMass number A:204 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:122Isotopic mass:203.973044(8) u (atomic weight of Lead-204)Nuclide mass:203.9280656 u (calculated nuclear mass without electrons)Mass excess:-25.10935 MeVMass defect:1.725728376 u (per nucleus)Nuclear binding energy:1607.50562787 MeV (per nucleus)
7.87992955 MeV (average binding energy per nucleon)Separation energy:SN = 8.395(6) MeV (first neutron)
SP = 6.6375(3) MeV (first proton)Half-life:1.4 × 1017 aDecay constant λ:1.569968064977 × 10-25 s-1Specific activity α:0.00046574230703933 Bq g-1
1.258762991998 × 10-14 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4803(14) femtometer fmYear of discovery:1932

 

Radioactive Decay

Half-life T½ = 1.4 × 1017 a respectively 4.41504 × 1024 seconds s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
α200Hg?1.9685(11) MeV

 

Parent Nuclides

Direct parent isotopes are: 204Bi, 208Po, 204Tl.

 

Occurrence

Comparison of the natural Lead isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Lead
Isotopic mixture		207.2 u100 %
Isotope 204Pb203.973044(8) u1.4(6) %1.4 × 1017 a0+
Isotope 206Pb205.974466(8) u24.1(30) %stable0+
Isotope 207Pb206.975897(8) u22.1(50) %stable1/2-
Isotope 208Pb207.976653(8) u52.4(70) %stable0+

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
204m1Pb1274.13(5) keV265(6) ns4+
204m2Pb2185.88(8) keV66.93(10) min9-
204m3Pb2264.42(6) keV0.45(+10-3) μs7-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 122) and isobaric (same nucleon number A = 204) with Lead-204. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 122Isobar A = 204
74196W
75197Re
76198Os
77199Ir204Ir
78200Pt204Pt
79201Au204Au
80202Hg204Hg
81203Tl204Tl
82204Pb204Pb
83205Bi204Bi
84206Po204Po
85207At204At
86208Rn204Rn
87209Fr204Fr
88210Ra204Ra
89211Ac204Ac
90212Th
91213Pa
92214U

 

External data and identifiers

Adopted Levels, Gammas:NuDat 204Pb

 

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Last update: 2020-10-22

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