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Isotopes of Antimony

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

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

All atomic nuclei of the chemical element antimony are summarized under antimony isotopes; these all consist of an atomic nucleus with 51 protons and, in the uncharged state, 51 electrons. The difference between each antimony isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Antimony Isotopes

The terrestrial antimony deposits are composed of the two stable isotopes antimony-121 and antimony-123 in a ratio of about 3:2.

Atomic Mass maQuantityHalf-lifeSpin
Antimony
Isotopic mixture		121,760 u100 %
Isotope 121Sb120,90381(2) u57,21(5) %stable5/2+
Isotope 123Sb122,90421(2) u42,79(5) %stable7/2+

 

In addition to the natural nuclides of antimony, about 35 other radionuclides and a large number of nuclear isomers are known. Radioisotopes of antimony are sometimes also referred to as radioantimony.

There are no technical applications for individual, pure antimony isotopes.

 

Isotope Table: Antimony

The two following tables list the most important data and properties of the Antimony isotopes. Further information on the individual Antimony 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
Antimony-10310351Sb52102.93969(32) u
[102.9117141 u]
{-56.1784 MeV}		5/2+
Antimony-10410451Sb53103.93647(13) u
[103.9084941 u]
{-59.17781 MeV}
Antimony-10510551Sb54104.931277(23) u
[104.9033011 u]
{-64.01506 MeV}		(5/2+)
Antimony-10610651Sb55105.928638(8) u
[105.9006621 u]
{-66.47327 MeV}		(2+)110I
Antimony-10710751Sb56106.924151(4) u
[106.8961751 u]
{-70.65289 MeV}		(5/2+)111I
Antimony-10810851Sb57107.922227(6) u
[107.8942511 u]
{-72.44508 MeV}		(4+)112I
Antimony-10910951Sb58108.918141(6) u
[108.8901651 u]
{-76.25117 MeV}		(5/2+)113I
109Te
Antimony-11011051Sb59109.916854(6) u
[109.8888781 u]
{-77.45 MeV}		(3+)110Te
Antimony-11111151Sb60110.913218(9) u
[110.8852421 u]
{-80.83691 MeV}		(5/2+)
Antimony-11211251Sb61111.912400(19) u
[111.8844241 u]
{-81.59887 MeV}		(3+)112Te
Antimony-11311351Sb62112.909375(18) u
[112.8813991 u]
{-84.41664 MeV}		5/2+113Te
Antimony-11411451Sb63113.909289(23) u
[113.8813131 u]
{-84.49675 MeV}		3+114Te
Antimony-11511551Sb64114.906598(17) u
[114.8786221 u]
{-87.0034 MeV}		5/2+115Te
Antimony-11611651Sb65115.906793(6) u
[115.8788171 u]
{-86.82176 MeV}		3+116Te
Antimony-116m1116m151Sb65115.906793(6) u
[115.8788171 u]
{-86.82176 MeV}		1+
Antimony-116m2116m251Sb65115.906793(6) u
[115.8788171 u]
{-86.82176 MeV}		8-
Antimony-11711751Sb66116.904842(9) u
[116.8768661 u]
{-88.63911 MeV}		5/2+117Te
Antimony-11811851Sb67117.905532(3) u
[117.8775561 u]
{-87.99638 MeV}		1+118Te
Antimony-118m1118m151Sb67117.905532(3) u
[117.8775561 u]
{-87.99638 MeV}		(3)+
Antimony-118m2118m251Sb67117.905532(3) u
[117.8775561 u]
{-87.99638 MeV}		8-
Antimony-11911951Sb68118.903946(8) u
[118.8759701 u]
{-89.47372 MeV}		5/2+119Te
Antimony-119m1119m151Sb68118.903946(8) u
[118.8759701 u]
{-89.47372 MeV}		(19/2-)
Antimony-119m2119m251Sb68118.903946(8) u
[118.8759701 u]
{-89.47372 MeV}		(27/2+)
Antimony-12012051Sb69119.905080(8) u
[119.8771041 u]
{-88.41741 MeV}		1+
Antimony-120m1120m151Sb69119.905080(8) u
[119.8771041 u]
{-88.41741 MeV}		8-
Antimony-120m2120m251Sb69119.905080(8) u
[119.8771041 u]
{-88.41741 MeV}		3+
Antimony-120m3120m351Sb69119.905080(8) u
[119.8771041 u]
{-88.41741 MeV}		(6)
Antimony-12112151Sb70120.90381(2) u
[120.8758341 u]
{-89.60041 MeV}		5/2+121Te
121Sn
Antimony-121m121m51Sb70120.90381(2) u
[120.8758341 u]
{-89.60041 MeV}		(25/2)
Antimony-12212251Sb71121.9051681(28) u
[121.8771922 u]
{-88.33535 MeV}		2-
Antimony-122m1122m151Sb71121.9051681(28) u
[121.8771922 u]
{-88.33535 MeV}		3+
Antimony-122m2122m251Sb71121.9051681(28) u
[121.8771922 u]
{-88.33535 MeV}		(5)+
Antimony-122m3122m351Sb71121.9051681(28) u
[121.8771922 u]
{-88.33535 MeV}		(8)-
Antimony-12312351Sb72122.90421(2) u
[122.8762341 u]
{-89.22781 MeV}		7/2+123Sn
123Te
Antimony-12412451Sb73123.9059358(16) u
[123.8779599 u]
{-87.62024 MeV}		3-
Antimony-124m1124m151Sb73123.9059358(16) u
[123.8779599 u]
{-87.62024 MeV}		5+
Antimony-124m2124m251Sb73123.9059358(16) u
[123.8779599 u]
{-87.62024 MeV}		(8)-
Antimony-124m3124m351Sb73123.9059358(16) u
[123.8779599 u]
{-87.62024 MeV}		3+,4+
Antimony-12512551Sb74124.9052530(28) u
[124.8772771 u]
{-88.25626 MeV}		7/2+125Sn
Antimony-12612651Sb75125.90725(3) u
[125.8792741 u]
{-86.39607 MeV}		(8-)126Sn
Antimony-126m1126m151Sb75125.90725(3) u
[125.8792741 u]
{-86.39607 MeV}		(5+)
Antimony-126m2126m251Sb75125.90725(3) u
[125.8792741 u]
{-86.39607 MeV}		(3-)
Antimony-126m3126m351Sb75125.90725(3) u
[125.8792741 u]
{-86.39607 MeV}		(3+)
Antimony-12712751Sb76126.906924(6) u
[126.8789481 u]
{-86.69974 MeV}		7/2+127Sn
Antimony-127m1127m151Sb76126.906924(6) u
[126.8789481 u]
{-86.69974 MeV}		(15/2-)
Antimony-127m2127m251Sb76126.906924(6) u
[126.8789481 u]
{-86.69974 MeV}
Antimony-12812851Sb77127.909146(21) u
[127.8811701 u]
{-84.62996 MeV}		8-128Sn
Antimony-128m128m51Sb77127.909146(21) u
[127.8811701 u]
{-84.62996 MeV}		5+
Antimony-12912951Sb78128.909147(23) u
[128.8811711 u]
{-84.62902 MeV}		7/2+129Sn
Antimony-129m1129m151Sb78128.909147(23) u
[128.8811711 u]
{-84.62902 MeV}		(19/2-)
Antimony-129m2129m251Sb78128.909147(23) u
[128.8811711 u]
{-84.62902 MeV}		(15/2-)
Antimony-13013051Sb79129.911663(15) u
[129.8836871 u]
{-82.28539 MeV}		(8-)130Sn
Antimony-130m130m51Sb79129.911663(15) u
[129.8836871 u]
{-82.28539 MeV}		(4,5)+
Antimony-13113151Sb80130.9119893(22) u
[130.8840134 u]
{-81.98144 MeV}		(7/2+)131Sn
Antimony-131m1131m151Sb80130.9119893(22) u
[130.8840134 u]
{-81.98144 MeV}		(15/2-)
Antimony-131m2131m251Sb80130.9119893(22) u
[130.8840134 u]
{-81.98144 MeV}		(19/2-)
Antimony-131m3131m351Sb80130.9119893(22) u
[130.8840134 u]
{-81.98144 MeV}		(23/2+)
Antimony-13213251Sb81131.9145080(26) u
[131.8865321 u]
{-79.63529 MeV}		(4)+132Sn
133Sn
248Cm
Antimony-132m1132m151Sb81131.9145080(26) u
[131.8865321 u]
{-79.63529 MeV}		(8-)
Antimony-13313351Sb82132.915272(3) u
[132.8872961 u]
{-78.92362 MeV}		(7/2+)133Sn
Antimony-13413451Sb83133.9205357(18) u
[133.8925598 u]
{-74.02052 MeV}		(0-)134Sn
135Sn
248Cm
Antimony-134m134m51Sb83133.9205357(18) u
[133.8925598 u]
{-74.02052 MeV}		(7-)
Antimony-13513551Sb84134.9251844(28) u
[134.8972085 u]
{-69.69028 MeV}		(7/2+)135Sn
136Sn
248Cm
Antimony-13613651Sb85135.930749(6) u
[135.9027731 u]
{-64.50689 MeV}		(1-)
Antimony-13713751Sb86136.93552(6) u
[136.9075441 u]
{-60.06273 MeV}		(7/2+)
Antimony-13813851Sb87137.94179(114) u
[137.9138141 u]
{-54.22227 MeV}		(3-)
Antimony-13913951Sb88138.94655(43) u
[138.9185741 u]
{-49.78835 MeV}		(7/2+)
Antimony-14014051Sb89139.95283(64) u
[139.9248541 u]
{-43.93857 MeV}		(3-,4-)
Antimony-14114151Sb90140.95801(54) u
[140.9300341 u]
{-39.11343 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Sb-10349 nsp → 102SnAL
Sb-1040.44 sEC/β+ → 104Sn
ε, p → 103In
p → 103Sn		> 92 %
< 7 %
< 1 %

AL
Sb-1051.22(11) sEC β+ → 105Sn
p → 104Sn		99 %
1 %		9.323(22) MeV
2.34 MeV		AL
Sb-1060.6(2) sEC β+ ? → 106Sn?10.880(9) MeVAL
Sb-1074.0(2) sEC/β+ → 107Sn100 %7.859(7) MeVAL
Sb-1087.4(3) sEC/β+ → 108Sn100 %9.625(8) MeVAL
Sb-10917.2(5) sEC/β+ → 109Sn100 %6.379(10) MeVAL
Sb-11023.6(3) sEC/β+ → 110Sn100 %8.392(15) MeVAL
Sb-11175(1) sEC/β+ → 111Sn100 %5.102(10) MeVAL
Sb-11253.5(6) sEC/β+ → 112Sn100 %7.056(18) MeVAL
Sb-1136.67(7) minEC/β+ → 113Sn100 %3.911(17) MeVAL
Sb-1143.49(3) minEC/β+ → 114Sn100 %6.063(22) MeVAL
Sb-11532.1(3) minEC/β+ → 115Sn100 %3.030(16) MeVAL
Sb-11615.8(8) minEC/β+ → 116Sn100 %4.704(5) MeVAL
Sb-116m1194(4) ns
Sb-116m260.3(6) minEC/β+ → 116Sn100 %
Sb-1172.80(1) hEC β+ → 117Sn
β+ 		83 %
1.7(3) %		1.758(8) MeV
AL
Sb-1183.6(1) minEC/β+ → 118Sn100 %3.6557(3) MeVAL
Sb-118m120.6(6) μs
Sb-118m25.00(2) hEC/β+ → 118Sn100 %
Sb-11938.19(22) hEC → 119Sn100 %0.591(8) MeVAL
Sb-119m1130(3) ns
Sb-119m20.85(9) sIso → 119Sb100 %
Sb-12015.89(4) minEC/β+ → 120Sn100 %2.681(7) MeVAL
Sb-120m15.76(2) dEC/β+ → 120Sn100 %
Sb-120m2246(2) ns
Sb-120m3400(8) ns
Sb-121stableAL
Sb-121m179(6) μsIso → 121Sb100 %
Sb-1222.7238(2) dEC/β+ → 122Sn
β- → 122Te		2.41(12) %
97.59(12) %		1.606(4) MeV
1.9791(21) MeV		AL
Sb-122m11.86(8) μs
Sb-122m20.53(3) msIso → 122Sb100 %
Sb-122m34.191(3) minIso → 122Sb100 %
Sb-123stableAL
Sb-12460.20(3) dβ- → 124Te100 %2.90507(13) MeVAL
Sb-124m193(5) sβ- → 124Te
Iso → 124Sb		25(5) %
75(5) %
Sb-124m220.2(2) minIso → 124Sb100 %
Sb-124m33.2(3) μs
Sb-1252.75856(25) aβ- → 125Te100 %0.7666(21) MeVAL
Sb-12612.35(6) dβ- → 126Te100 %3.67(3) MeVAL
Sb-126m119.15(8) minβ- → 126Te
Iso → 126Sb		86(4) %
14(4) %
Sb-126m211 sIso → 126Sb100 %
Sb-126m3553(5) ns
Sb-1273.85(5) dβ- → 127Te100 %1.582(5) MeVAL
Sb-127m111(7) μs
Sb-127m20.165(20) μs
Sb-1289.05(4) hβ- → 128Te100 %4.363(19) MeVAL
Sb-128m10.41(18) minβ- → 128Te
Iso → 128Sb		96.4 %
3.6 %
Sb-1294.366(26) hβ- → 129Te100 %2.375(21) MeVAL
Sb-129m117.7(1) minβ- → 129Te
Iso → 129Sb		85 %
15 %
Sb-129m22.2(2) μsIso → 129Sb
Sb-13039.5(8) minβ- → 130Te100 %5.067(14) MeVAL
Sb-130m6.3(2) minβ- → 130Te100 %
Sb-13123.03(4) minβ- → 131Te100 %3.2296(21) MeVAL
Sb-131m191(4) μs
Sb-131m24.3(8) μs
Sb-131m31.1(2) μs
Sb-1322.79(7) minβ- → 132Te100 %5.553(4) MeVAL
Sb-132m14.10(5) minβ- → 132Te100 %
Sb-1332.34(5) minβ- → 133Te100 %4.014(4) MeVAL
Sb-1340.78(6) sβ- → 134Te100 %8.513(3) MeVAL
Sb-134m10.07(5) sβ- → 134Te
β-, n → 133Te		99.922 %
0.088(4) %
Sb-1351.679(15) sβ- → 135Te
β-, n → 134Te		88(3) %
22(3) %		8.038(3) MeV
4.772(4) MeV		AL
Sb-136923(14) msβ- → 136Te
β-, n → 135Te
β-, 2n → 134Te		81.5 %
18.5(18) %
< 1 %		9.95 MeV
5.31 MeV
AL
Sb-137450(50) msβ- → 137Te
β-, n → 136Te		51 %
49(10) %		9.24(5) MeV
6.29(5) MeV		AL
Sb-138348(15) msβ-, n 137Te
β-, 2n → 138Te
β- → 136Te		72(8) %
?
?		7.01 MeV

AL
Sb-13993(13) msβ- → 139Te
β-, n → 138Te
β-, 2n → 137Te
β-, 3n → 138Te		100 %
90(10) %
?
?		10.4 MeV


AL
Sb-140173(12) msβ- → 140Te
β-, n → 139Te
β-, 2n → 138Te		69.4 %
23(4) %
7.6(25) %		12.64(60) MeV

AL
Sb-141β- → 141Te
β-, n → 140Te
β-, 2n → 139Te		100 %
?
?		11.38(64) MeV
9.39(50) MeV

 

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 Antimony 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 Antimony 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 Antimony 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)
121Sb
57,21(5) %
5/2+		+ 3,3580(16)6,4442
{-0,543(11)}		10,25510,16302
2,8101
123Sb
42,79(5) %
7/2+		+ 2,5457(12)3,4904
{- 0,692(14)}		5,55320,04659
2,7390

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 Antimony radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Sb-115106 Bq10 Bq/g32.1 min
Sb-116106 Bq10 Bq/g15.8 min
Sb-116m105 Bq10 Bq/g60.3 min
Sb-117107 Bq100 Bq/g2.8 h
Sb-118m106 Bq10 Bq/g5.0 h
Sb-119107 Bq1000 Bq/g38.3 h
Sb-120m106 Bq10 Bq/g5.8 d
Sb-122104 Bq10 Bq/g0,1 TBq10 Bq cm-22.7 d
Sb-124106 Bq1 Bq/g0,04 TBq1 Bq cm-260.2 d
Sb-125+106 Bq0,1 Bq/g0,2 TBq10 Bq cm-2Te-125m2.8 a
Sb-126105 Bq10 Bq/g0,02 TBq12.4 d
Sb-126m105 Bq10 Bq/g19.1 min
Sb-127+106 Bq10 Bq/g3.9 d
Sb-128m105 Bq10 Bq/g9.0 h
Sb-129+106 Bq10 Bq/g4.4 h
Sb-130105 Bq10 Bq/g39.5 min
Sb-131106 Bq10 Bq/g23.0 min

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

 

Literature Sources and References

Properties of the Antimony 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.

Antimony: NMR properties - 121Sb-NMR, 123Sb-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] - Olivier Rouxel, John Ludden, Yves Fouquet:
Antimony isotope variations in natural systems and implications for their use as geochemical tracers.
In: Chemical Geology, (2003), DOI 10.1016/S0009-2541(03)00121-9.

[10] - J. Kathawa, C. Fry, M. Thoennessen:
Discovery of palladium, antimony, tellurium, iodine, and xenon isotopes.
In: Atomic Data and Nuclear Data Tables, (2013), DOI 10.1016/j.adt.2012.01.004.

 

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