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Isotopes of Arsenic

List, data and properties of all known isotopes of Arsenic.

Content
Atomic properties
Decay properties
NMR active nuclides
Radiation protection
References
Arsenic isotopes

All atomic nuclei of the chemical element arsenic are summarized under arsenic isotopes; these consist of an atomic nucleus with 33 protons and, in the uncharged state, 33 electrons. The difference between the individual arsenic isotopes is due to the number of neutrons in the nucleus.

The arsenic is mononuclide element or pure element; it only occurs in nature in the form of a single nuclide: arsenic-75.

The standard atomic mass of arsenic is 74.921595(6) u.

In addition to the natural and only stable arsenic isotope, 29 other unstable nuclides are known and have been characterized accordingly.

 

Isotope Table: Arsenic

The two following tables list the most important data and properties of the Arsenic isotopes. Further information on the individual Arsenic isotopes is listed on separate pages and can be accessed via the link in column 1.

 

Atomic Properties

Isotope
Nuclide		ENAtomic Mass
[Nuclear Mass]
{Mass Excess}		Spin I
(h/2π)		Parent
123456
Arsenic-626233As2961.97320(32) u
[61.9550975 u]
{-24.96404 MeV}		1+
Arsenic-636333As3062.96404(21) u
[62.9459375 u]
{-33.49652 MeV}		3/2-
Arsenic-646433As3163.95756(22) u
[63.9394575 u]
{-39.53261 MeV}		0+
Arsenic-656533As3264.94961(9) u
[64.9315075 u]
{-46.93798 MeV}		3/2-
Arsenic-666633As3365.944149(6) u
[65.9260465 u]
{-52.02487 MeV}		(0+)
Arsenic-66m166m133As3365.944149(6) u
[65.9260465 u]
{-52.02487 MeV}		(5+)
Arsenic-66m266m233As3365.944149(6) u
[65.9260465 u]
{-52.02487 MeV}		(9+)
Arsenic-676733As3466.9392511(5) u
[66.9211486 u]
{-56.58724 MeV}		(5/2-)67Se
Arsenic-686833As3567.936774(20) u
[67.9186715 u]
{-58.89464 MeV}		3+68Se
Arsenic-68m68m33As3567.936774(20) u
[67.9186715 u]
{-58.89464 MeV}		1+
Arsenic-696933As3668.93225(3) u
[68.9141475 u]
{-63.10872 MeV}		5/2-69Se
Arsenic-707033As3769.93093(5) u
[69.9128275 u]
{-64.33829 MeV}		4+70Se
Arsenic-70m70m33As3769.93093(5) u
[69.9128275 u]
{-64.33829 MeV}		2+
Arsenic-717133As3870.927114(4) u
[70.9090115 u]
{-67.89287 MeV}		5/2-71Se
Arsenic-727233As3971.926752(4) u
[71.9086495 u]
{-68.23007 MeV}		2-72Se
Arsenic-737333As4072.923829(4) u
[72.9057265 u]
{-70.95283 MeV}		3/2-73Se
Arsenic-73m73m33As4072.923829(4) u
[72.9057265 u]
{-70.95283 MeV}		9/2+
Arsenic-747433As4173.9239286(18) u
[73.9058261 u]
{-70.86005 MeV}		2-
Arsenic-757533As4274.921595(6) u
[74.9034925 u]
{-73.03379 MeV}		3/2-75Se
75Ge
Arsenic-75m75m33As4274.921595(6) u
[74.9034925 u]
{-73.03379 MeV}		9/2+
Arsenic-767633As4375.922392(1) u
[75.9042895 u]
{-72.29139 MeV}		2-
Arsenic-76m76m33As4375.922392(1) u
[75.9042895 u]
{-72.29139 MeV}		(1)+
Arsenic-777733As4476.9206476(18) u
[76.9025451 u]
{-73.91628 MeV}		3/2-77Ge
Arsenic-77m77m33As4476.9206476(18) u
[76.9025451 u]
{-73.91628 MeV}		9/2+
Arsenic-787833As4577.921828(10) u
[77.9037255 u]
{-72.81675 MeV}		2-78Ge
Arsenic-797933As4678.920948(6) u
[78.9028455 u]
{-73.63646 MeV}		3/2-79Ge
Arsenic-79m79m33As4678.920948(6) u
[78.9028455 u]
{-73.63646 MeV}		(9/2)+
Arsenic-808033As4779.922475(4) u
[79.9043725 u]
{-72.21407 MeV}		1+80Ge
Arsenic-818133As4880.9221323(28) u
[80.9040298 u]
{-72.5333 MeV}		3/2-81Ge
Arsenic-828233As4981.924739(4) u
[81.9066365 u]
{-70.10517 MeV}		(2-)82Ge
Arsenic-82m82m33As4981.924739(4) u
[81.9066365 u]
{-70.10517 MeV}		(5-)
Arsenic-838333As5082.925207(3) u
[82.9071045 u]
{-69.66923 MeV}		(5/2-)83Ge
Arsenic-848433As5183.929303(3) u
[83.9112005 u]
{-65.85383 MeV}		(3-)84Ge
Arsenic-858533As5284.932164(3) u
[84.9140615 u]
{-63.18883 MeV}		(3/2-)85Ge
Arsenic-868633As5385.936702(4) u
[85.9185995 u]
{-58.96171 MeV}
Arsenic-878733As5486.940292(3) u
[86.9221895 u]
{-55.61764 MeV}		(3/2-)
Arsenic-888833As5587.94555(21) u
[87.9274475 u]
{-50.71985 MeV}
Arsenic-898933As5688.94976(32) u
[88.9316575 u]
{-46.79826 MeV}
Arsenic-909033As5789.95563(43) u
[89.9375275 u]
{-41.33039 MeV}
Arsenic-919133As5890.96039(43) u
[90.9422875 u]
{-36.89648 MeV}
Arsenic-929233As5991.96674(54) u
[91.9486375 u]
{-30.98149 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
As-62p → 61GeAL
As-6343 nsp → 62Ge?AL
As-6418 msEC/β+ → 64Ge100 %14.78(20) MeVAL
As-65128(16) msEC/β+ → 65Ge100 %9.54(8) MeVAL
As-6695.77(23) msEC/β+ → 66Ge100 %9.582(6) MeVAL
As-66m11.1(1) μs
As-66m28.2
As-6742.5(12) sEC/β+ → 67Ge100 %6.071(5) MeVAL
As-68151.6(8) sEC/β+ → 68Ge100 %8.0843(26) MeVAL
As-68m107(+23-16) ns
As-6915.2(2) minEC/β+ → 69Ge100 %3.99(3) MeVAL
As-7052.6(3) minEC/β+ → 70Ge100 %6.22(5) MeVAL
As-70m96(3) μs
As-7165.30(7) hEC/β+ → 71Ge100 %2.013(4) MeVAL
As-7226.0(1) hEC/β+ → 72Ge100 %4.356(4) MeVAL
As-7380.30(6) dEC → 73Ge100 %0.345(4) MeVAL
As-73m5.7(2) μsIso → 73As
As-7417.77(2) dEC/β+ → 74Ge
β- → 74Se		66(2) %
34(2) %		2.5624(17) MeV
1.3531(17) MeV		AL
As-75stableAL
As-75m17.62(23) msIso → 75As100 %AL
As-7626.24(9) hβ- → 76Se100 %2.9606(9) MeVAL
As-76m1.84(6) μs
As-7738.79(5) hβ- → 77Se100 %0.6832(17) MeVAL
As-77m114.0(25) μsIso → 77As100 %AL
As-7890.7(2) minβ- → 78Se100 %4.209(10) MeVAL
As-799.01(15) minβ- → 79Se100 %2.281(5) MeVAL
As-79m1.21(1) μsIso → 79As100 %AL
As-8015.2(2) sβ- → 80Se100 %5.545(3) MeVAL
As-8133.3(8) sβ- → 81Se100 %3.8557(28) MeVAL
As-8219.1(5) sβ- → 82Se100 %7.488(4) MeVAL
As-82m13.6(4) sβ- → 82Se100 %AL
As-8313.4(3) sβ- → 83Se100 %5.671(4) MeVAL
As-844.2(5) sβ- → 84Se
β-, n → 83Se		99.82 %
0.18 %		10.094(4) MeV
1.416(4) MeV		AL
As-852.021(12) sβ- → 85Se
β-, n → 84Se		37.1 %
62.9(20) %		9.224(4) MeV
4.687(4) MeV		AL
As-86945(8) msβ- → 86Se
β-, n → 85Se
β-, 2n → 84Se
35.5(6) %
?		11.541(4) MeV
5.380(4) MeV
AL
As-87484(40) msβ- → 87Se
β-, n → 86Se		84.6 %
15.4(22) %		10.808(4) MeV
6.814(4) MeV		AL
As-880.20(+20-9) sβ- → 88Se
β-, n → 87Se
?		13.16(20) MeV
7.63(20) MeV		AL
As-89300 nsβ- → 89Se
β-, n → 88Se
β-, 2n → 87Se		?
?
?		12.19(30) MeV
9.01(30) MeV
AL
As-90300 nsβ- → 90Se
β-, n → 89Se
β-, 2n → 88Se

14.47(52) MeV
9.59(40) MeV
AL
As-91β- → 91Se
β-, n → 90Se
16.68(59) MeV
10.83(52) MeV		AL
As-92β- → 92Se?1.574(64) MeVAL

 

Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Arsenic isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.

7 - isotope notation in short form.
8 - decay: half-live of the Arsenic isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Arsenic nuclides

Nuclide
quantity 1)
spin		Nuclear
magnetic
moment
μ/μN		Gyromagnetic ratio
{Quadrupole moment}		Resonant
frequency
v0 bei 1 T		Relative
sensitivity
H0 = const.
v0 = const. 3)
75As
100 %
3/2-		+1,4383(3)4,5961
{+ 0,311(2)}		7,31500,02536
0,8590

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

3) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Arsenic radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
As-69105 Bq10 Bq/g15.2 min
As-70105 Bq10 Bq/g52.6 min
As-71106 Bq10 Bq/g65.3 h
As-72105 Bq10 Bq/g0,04 TBq26.0 h
As-73+107 Bq1000 Bq/g40 TBq100 Bq cm-280.3 d
As-74106 Bq10 Bq/g0,09 TBq1 Bq cm-217.8 d
As-76105 Bq10 Bq/g0,2 TBq10 Bq cm-226.4 h
As-77106 Bq1000 Bq/g8 TBq100 Bq cm-238.8 h
As-78105 Bq10 Bq/g1.5 h

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Arsenic nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Arsenic: NMR properties - 75As-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - Marc Jennewein:
Production, radiochemical separation and chemical coupling of radioactive arsenic isotopes to synthesize radiopharmaceuticals for molecular imaging.
In: Dissertation Chemie, Universität Mainz, (2005).

[10] - Markus Jahn:
Nicht geträgerte Radioarsenisotope: ihre Herstellung, Abtrennung und Markierung von Proteinen.
In: Dissertation Chemie, Universität Mainz, (2009).

[11] - A. Shore, A. Fritsch, M. Heim, A. Schuh, M. Thoennessen:
Discovery of the arsenic isotopes.
In: Atomic Data and Nuclear Data Tables, (2010), DOI 10.1016/j.adt.2009.11.001.

 

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