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Bismuth-211

Properties and data of the isotope 211Bi.

 

Bismuth-211 is the radioisotope of the element bismuth, whose atomic nucleus has 128 neutrons in addition to the element-specific 83 protons, resulting in a mass number of 211: 211 Bi.

See also: list of Bismuth isotopes.

 

General data

Name of the isotope:Bismuth-211; Bi-211Namen:Actinium CSymbol:211BiMass number A:211Atomic number Z:83 (= number of protons)Neutrons N:128Isotopic mass:210.987269(6) u (atomic weight of Bismuth-211)Nuclide mass:210.9417421 u (calculated nuclear mass without electrons)Mass excess:-11.85885 MeVMass defect:1.771317904 u (per nucleus)Nuclear binding energy:1649.97199967 MeV (per nucleus)
7.81977251 MeV (average binding energy per nucleon)
Separation energy:SN = 5.138(5) MeV (first neutron)
SP = 4.420(5) MeV (first proton)
Half-life:2.14(2) minDecay constant λ:0.0053983425277254 s-1Spin and parity:9/2-Year of discovery:1905

 

Radioactive Decay

Half-life T½ = 2.14(2) min (minutes) respectively 1.284 × 102 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-211Po0,276(4) %0,573(5) MeV
α207Tl99,724(4) %6,7504(5) MeV

 

Bismut-211 Gamma-Emissionen

EγIγDose (MeV/Bq-s)
351.07(5) keV13.02(12) %0.0457(4)

 

Bismuth-211 decay chain

 

Parent Nuclides

Direct parent isotopes are: 215At, 211Pb.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
211mBi1257(10) keV1,4(3) μs(25/2-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 128) and isobaric (same nucleon number A = 211) with Bismuth-211. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 128Isobar A = 211
77205Ir
78206Pt
79207Au
80208Hg211Hg
81209Tl211Tl
82210Pb211Pb
83211Bi211Bi
84212Po211Po
85213At211At
86214Rn211Rn
87215Fr211Fr
88216Ra211Ra
89217Ac211Ac
90218Th211Th
91219Pa
92220U
95223Am

 

External data and identifiers

CAS:15229-37-5InChI Key:JCXGWMGPZLAOME-NJFSPNSNSA-NSMILES:[211Bi]PubChem:ID 6337577Adopted Levels, Gammas:NuDat 211Bi

 


Category: Isotopes

Last update: 26.11.2022



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