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Isotopes of Arsenic

List, data and properties of all known isotopes of Arsenic as well as radioactive decay products and intermediate products.

 

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

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
62As336229Arsenic-6261.97320(32) u
[61.9550975 u]
{-24.96404 MeV}
1+
63As336330Arsenic-6362.96404(21) u
[62.9459375 u]
{-33.49652 MeV}
3/2-
64As336431Arsenic-6463.95756(22) u
[63.9394575 u]
{-39.53261 MeV}
0+
65As336532Arsenic-6564.94961(9) u
[64.9315075 u]
{-46.93798 MeV}
3/2-
66As336633Arsenic-6665.944149(6) u
[65.9260465 u]
{-52.02487 MeV}
(0+)
66m1As336633Arsenic-66m165.944149(6) u
[65.9260465 u]
{-52.02487 MeV}
(5+)
66m2As336633Arsenic-66m265.944149(6) u
[65.9260465 u]
{-52.02487 MeV}
(9+)
67As336734Arsenic-6766.9392511(5) u
[66.9211486 u]
{-56.58724 MeV}
(5/2-)67Se
68As336835Arsenic-6867.936774(20) u
[67.9186715 u]
{-58.89464 MeV}
3+68Se
68mAs336835Arsenic-68m67.936774(20) u
[67.9186715 u]
{-58.89464 MeV}
1+
69As336936Arsenic-6968.93225(3) u
[68.9141475 u]
{-63.10872 MeV}
5/2-+1.622(2)69Se
70As337037Arsenic-7069.93093(5) u
[69.9128275 u]
{-64.33829 MeV}
4++2.1104(5)70Se
70mAs337037Arsenic-70m69.93093(5) u
[69.9128275 u]
{-64.33829 MeV}
2+
71As337138Arsenic-7170.927114(4) u
[70.9090115 u]
{-67.89287 MeV}
5/2-+1.673(2)71Se
72As337239Arsenic-7271.926752(4) u
[71.9086495 u]
{-68.23007 MeV}
2--2.1610(6)72Se
73As337340Arsenic-7372.923829(4) u
[72.9057265 u]
{-70.95283 MeV}
3/2-73Se
73mAs337340Arsenic-73m72.923829(4) u
[72.9057265 u]
{-70.95283 MeV}
9/2++ 5.234(14)
74As337441Arsenic-7473.9239286(18) u
[73.9058261 u]
{-70.86005 MeV}
2-- 1.596(3)
75As337542Arsenic-7574.921595(6) u
[74.9034925 u]
{-73.03379 MeV}
3/2-+1.4383(3)75Se
75Ge
75mAs337542Arsenic-75m74.921595(6) u
[74.9034925 u]
{-73.03379 MeV}
9/2+
76As337643Arsenic-7675.922392(1) u
[75.9042895 u]
{-72.29139 MeV}
2-(-)0.9023(10)
76mAs337643Arsenic-76m75.922392(1) u
[75.9042895 u]
{-72.29139 MeV}
(1)++ 0.559(5)
77As337744Arsenic-7776.9206476(18) u
[76.9025451 u]
{-73.91628 MeV}
3/2-+1.2940(13)77Ge
77mAs337744Arsenic-77m76.9206476(18) u
[76.9025451 u]
{-73.91628 MeV}
9/2++ 5.525(9)
78As337845Arsenic-7877.921828(10) u
[77.9037255 u]
{-72.81675 MeV}
2-78Ge
79As337946Arsenic-7978.920948(6) u
[78.9028455 u]
{-73.63646 MeV}
3/2-79Ge
79mAs337946Arsenic-79m78.920948(6) u
[78.9028455 u]
{-73.63646 MeV}
(9/2)+
80As338047Arsenic-8079.922475(4) u
[79.9043725 u]
{-72.21407 MeV}
1+80Ge
81As338148Arsenic-8180.9221323(28) u
[80.9040298 u]
{-72.5333 MeV}
3/2-81Ge
82As338249Arsenic-8281.924739(4) u
[81.9066365 u]
{-70.10517 MeV}
(2-)82Ge
82mAs338249Arsenic-82m81.924739(4) u
[81.9066365 u]
{-70.10517 MeV}
(5-)
83As338350Arsenic-8382.925207(3) u
[82.9071045 u]
{-69.66923 MeV}
(5/2-)83Ge
84As338451Arsenic-8483.929303(3) u
[83.9112005 u]
{-65.85383 MeV}
(3-)84Ge
85As338552Arsenic-8584.932164(3) u
[84.9140615 u]
{-63.18883 MeV}
(3/2-)85Ge
86As338653Arsenic-8685.936702(4) u
[85.9185995 u]
{-58.96171 MeV}
87As338754Arsenic-8786.940292(3) u
[86.9221895 u]
{-55.61764 MeV}
(3/2-)
88As338855Arsenic-8887.94555(21) u
[87.9274475 u]
{-50.71985 MeV}
89As338956Arsenic-8988.94976(32) u
[88.9316575 u]
{-46.79826 MeV}
90As339057Arsenic-9089.95563(43) u
[89.9375275 u]
{-41.33039 MeV}
91As339158Arsenic-9190.96039(43) u
[90.9422875 u]
{-36.89648 MeV}
92As339259Arsenic-9291.96674(54) u
[91.9486375 u]
{-30.98149 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
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) μs1356.63(17) keV
As-66m28.23023.8(3) keV
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) ns425.1(2) keV
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) μs32.046(23) keV
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 → 73As427.902(21) keV
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 %303.9243(8) keVAL
As-7626.24(9) hβ-76Se100 %2.9606(9) MeVAL
As-76m1.84(6) μs44.425(1) keV
As-7738.79(5) hβ-77Se100 %0.6832(17) MeVAL
As-77m114.0(25) μsIso → 77As100 %475.48(4) keVAL
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 %772.81(6) keVAL
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 %131.6(5) keVAL
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 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Arsenic isotope.
6 - 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.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - 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.
10 - Decay: Half-live of the Arsenic isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: 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.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - 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
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
75As
100 %
3/2-
+1,4383(3)4,5961+ 31,1(2)7,31500,02536
0,8590

1) Quantity Percentage of natural occurrence.

2) 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), DOI https://nbn-resolving.de/urn:nbn:de:hebis:77-7727.

[10] - Markus Jahn:
Nicht geträgerte Radioarsenisotope: ihre Herstellung, Abtrennung und Markierung von Proteinen.
In: Dissertation Chemie, Universität Mainz, (2009), DOI https://nbn-resolving.de/urn:nbn:de:hebis:77-20075.

[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.

 


Category: Isotopes

Last update: 05.07.2020



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