Bismuth-213

Properties and data of the isotope ²¹³Bi.

Content

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].

General data

Name of the isotope:Bismuth-213; Bi-213Symbol:²¹³Bi or 21383BiMass number A:213 (= number of nucleons)Atomic 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:S_N = 5.185(5) MeV (first neutron)
S_P = 4.972(5) MeV (first proton)Half-life:45.59(6) minDecay constant λ:0.00025339883766906 s^-1Specific activity α:7.198129689562 × 10⁺¹⁷ Bq g^-1
19454404.566386 Ci g^-1Spin and parity:
(nuclear angular momentum)9/2-Magnetic dipole moment:μ(μ_N) = + 3.717(13)Quadrupole moment Q:0.60(5) barn (100 fm²)Nuclear g-factor:g_l = 0.826Charge radius:5.5586(900) femtometer fmYear of discovery:1947

Radioactive Decay

Half-life T_½ = 45.59(6) min (minutes) respectively 2.7354 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²¹³Po	97.80(10) %	1.422(5) MeV
α	²⁰⁹Tl	2.20(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).

Parent Nuclides

Direct parent isotope is: ²¹⁷At.

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.

OZ	Isotone N = 130	Isobar A = 213
78	²⁰⁸Pt
79	²⁰⁹Au
80	²¹⁰Hg	²¹³Hg
81	²¹¹Tl	²¹³Tl
82	²¹²Pb	²¹³Pb
83	²¹³Bi	²¹³Bi
84	²¹⁴Po	²¹³Po
85	²¹⁵At	²¹³At
86	²¹⁶Rn	²¹³Rn
87	²¹⁷Fr	²¹³Fr
88	²¹⁸Ra	²¹³Ra
89	²¹⁹Ac	²¹³Ac
90	²²⁰Th	²¹³Th
91	²²¹Pa	²¹³Pa
92	²²²U

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.