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Actinium-223

Properties and data of the isotope 223Ac.

 

Actinium-223 is the short-lived and only artificially accessible radioisotope of the element Actinium, whose atomic nucleus has 134 neutrons in addition to the element-specific 89 protons, resulting in a mass number of 223: 223Ac.

See also: list of Actinium isotopes.

 

General data

Name of the isotope:Actinium-223; Ac-223Symbol:223AcMass number A:223Atomic number Z:89 (= number of protons)Neutrons N:134Isotopic mass:223.019137(8) u (atomic weight of Actinium-223)Nuclide mass:222.9703196 u (calculated nuclear mass without electrons)Mass excess:17.826 MeVMass defect:1.838389592 u (per nucleus)Nuclear binding energy:1712.44887461 MeV (per nucleus)
7.67914294 MeV (average binding energy per nucleon)
Separation energy:SN = 6.867(9) MeV (first neutron)
SP = 3.783(8) MeV (first proton)
Half-life:2.10(5) minDecay constant λ:0.0055011680996821 s-1Spin and parity:(5/2-)Year of discovery:1948

 

Radioactive Decay

Half-life T½ = 2.10(5) min (minutes) respectively 1.26 × 102 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α219Fr99 %6,7832(10) MeV
EE223Ra1 %0,593(7) MeV

 

Actinium-223 radioactive decay chain

 

Parent Nuclides

Direct parent isotope is: 227Pa.

 

Occurrence

Comparison of the natural Actinium isotopes including isotopic abundance (proportion of the isotope mixture):

 

Atomic Mass maQuantityHalf-lifeSpin
Actinium
Isotopic mixture
227,027752408 u100 %
Isotope 223Ac223,019137(8) utrace2.10(5) min(5/2-)
Isotope 224Ac224,021722(4) utrace2.78(16) h(0-)
Isotope 227Ac227,0277507(21) u100 %21.772(3) a3/2-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 134) and isobaric (same nucleon number A = 223) with Actinium-223. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 134Isobar A = 223
80214Hg
81215Tl
82216Pb
83217Bi223Bi
84218Po223Po
85219At223At
86220Rn223Rn
87221Fr223Fr
88222Ra223Ra
89223Ac223Ac
90224Th223Th
91225Pa223Pa
92226U223U
93227Np
94228Pu
95229Am223Am

 

External data and identifiers

InChI Key:QQINRWTZWGJFDB-AHCXROLUSA-NSMILES:[223Ac]PubChem:ID 44154934Adopted Levels, Gammas:NuDat 223Ac

 


Category: Isotopes

Last update: 26.11.2022



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