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Properties and data of the isotope 213Bi.


Bismuth-213 is the radioisotope of the element Bismuth, whose atomic nucleus has 130 neutrons in addition to the element-specific 83 protons, resulting in a mass number of 213.

The α-emitting radionuclide bismuth-213 has interesting properties as an isotope for radionuclide therapy (TRNT). Corresponding preclinical and clinical studies have already been published. The article by Stefan Ahenkorah et. al. gives an up-to-date overview [1].

See also: list of Bismuth isotopes.


General data

Name of the isotope:Bismuth-213; Bi-213Symbol:213BiMass number A:213Atomic number Z:83 (= number of protons)Neutrons N:130Isotopic mass:212.994384(5) u (atomic weight of Bismuth-213)Nuclide mass:212.9488571 u (calculated nuclear mass without electrons)Mass excess:-5.23127 MeVMass defect:1.781532736 u (per nucleus)Nuclear binding energy:1659.48705439 MeV (per nucleus)
7.79101903 MeV (average binding energy per nucleon)
Separation energy:SN = 5.185(5) MeV (first neutron)
SP = 4.972(5) MeV (first proton)
Half-life:45.59(6) minDecay constant λ:0.00025339883766906 s-1Spin and parity:9/2-Charge radius:5.5586(900) femtometer fmYear of discovery:1947


Radioactive Decay

Half-life T½ = 45.59(6) min (minutes) respectively 2.7354 × 103 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
β-213Po97,80(10) %1,422(5) MeV
α209Tl2,20(10) %5,988(3) MeV


The figure shows the radioactive decay cascade of the Bi-213 nuclide. The isotope is an unstable intermediate in the so-called neptunium series, which starts from Neptunium-237 (complete decay series: see there).


Bismuth-213 radioactive decay


Parent Nuclides

Direct parent isotope is: 217At.


Radiation Protection

The German Radiation Protection Ordinance, for example, specifies the following limit values for the isotope Bismuth-213 (exemption limits, clearance values and other values as a radioactive or highly radioactive source of radiation (HASS)):

Isotope:Bi-213+Exemption level:106 BqExemption level per gram:100 Bq/g
Unrestricted handling of solids and liquids.
Half-life:45.6 min


Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 130) and isobaric (same nucleon number A = 213) with Bismuth-213. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.


OZIsotone N = 130Isobar A = 213


External data and identifiers

Adopted Levels, Gammas:NuDat 213Bi


Literature and References

[1] - Stephen Ahenkorah, Irwin Cassells, Christophe M. Deroose et al.:
Bismuth-213 for Targeted Radionuclide Therapy: From Atom to Bedside.
In: Pharmaceutics, (2021), DOI 10.3390/pharmaceutics13050599.


Category: Isotopes

Last update: 26.11.2022

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