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Isotopes of Antimony

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

 

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

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
103Sb5110352Antimony-103102.93969(32) u
[102.9117141 u]
{-56.1784 MeV}
5/2+
104Sb5110453Antimony-104103.93647(13) u
[103.9084941 u]
{-59.17781 MeV}
105Sb5110554Antimony-105104.931277(23) u
[104.9033011 u]
{-64.01506 MeV}
(5/2+)
106Sb5110655Antimony-106105.928638(8) u
[105.9006621 u]
{-66.47327 MeV}
(2+)110I
107Sb5110756Antimony-107106.924151(4) u
[106.8961751 u]
{-70.65289 MeV}
(5/2+)111I
108Sb5110857Antimony-108107.922227(6) u
[107.8942511 u]
{-72.44508 MeV}
(4+)112I
109Sb5110958Antimony-109108.918141(6) u
[108.8901651 u]
{-76.25117 MeV}
(5/2+)113I
109Te
110Sb5111059Antimony-110109.916854(6) u
[109.8888781 u]
{-77.45 MeV}
(3+)110Te
111Sb5111160Antimony-111110.913218(9) u
[110.8852421 u]
{-80.83691 MeV}
(5/2+)
112Sb5111261Antimony-112111.912400(19) u
[111.8844241 u]
{-81.59887 MeV}
(3+)112Te
113Sb5111362Antimony-113112.909375(18) u
[112.8813991 u]
{-84.41664 MeV}
5/2+113Te
114Sb5111463Antimony-114113.909289(23) u
[113.8813131 u]
{-84.49675 MeV}
3++ 1.72(8)114Te
115Sb5111564Antimony-115114.906598(17) u
[114.8786221 u]
{-87.0034 MeV}
5/2++ 3.46(1)115Te
116Sb5111665Antimony-116115.906793(6) u
[115.8788171 u]
{-86.82176 MeV}
3+2.715(9)116Te
116m1Sb5111665Antimony-116m1115.906793(6) u
[115.8788171 u]
{-86.82176 MeV}
1++2.47(9)
116m2Sb5111665Antimony-116m2115.906793(6) u
[115.8788171 u]
{-86.82176 MeV}
8-2.59(22)
117Sb5111766Antimony-117116.904842(9) u
[116.8768661 u]
{-88.63911 MeV}
5/2++ 3.43(6)117Te
118Sb5111867Antimony-118117.905532(3) u
[117.8775561 u]
{-87.99638 MeV}
1+2.46(7)118Te
118m1Sb5111867Antimony-118m1117.905532(3) u
[117.8775561 u]
{-87.99638 MeV}
(3)++2.63(5)
118m2Sb5111867Antimony-118m2117.905532(3) u
[117.8775561 u]
{-87.99638 MeV}
8-2.32(4)
119Sb5111968Antimony-119118.903946(8) u
[118.8759701 u]
{-89.47372 MeV}
5/2++ 3.45(1)119Te
119m1Sb5111968Antimony-119m1118.903946(8) u
[118.8759701 u]
{-89.47372 MeV}
(19/2-)+3.14(6)
119m2Sb5111968Antimony-119m2118.903946(8) u
[118.8759701 u]
{-89.47372 MeV}
(27/2+)
120Sb5112069Antimony-120119.905080(8) u
[119.8771041 u]
{-88.41741 MeV}
1+2.3(2)
120m1Sb5112069Antimony-120m1119.905080(8) u
[119.8771041 u]
{-88.41741 MeV}
8-2.34(3)
120m2Sb5112069Antimony-120m2119.905080(8) u
[119.8771041 u]
{-88.41741 MeV}
3++2.584(6)
120m3Sb5112069Antimony-120m3119.905080(8) u
[119.8771041 u]
{-88.41741 MeV}
(6)
121Sb5112170Antimony-121120.90381(2) u
[120.8758341 u]
{-89.60041 MeV}
5/2++ 3.3580(16)121Te
121Sn
121mSb5112170Antimony-121m120.90381(2) u
[120.8758341 u]
{-89.60041 MeV}
(25/2)
122Sb5112271Antimony-122121.9051681(28) u
[121.8771922 u]
{-88.33535 MeV}
2-- 1.90(2)
122m1Sb5112271Antimony-122m1121.9051681(28) u
[121.8771922 u]
{-88.33535 MeV}
3++2.983(12)
122m2Sb5112271Antimony-122m2121.9051681(28) u
[121.8771922 u]
{-88.33535 MeV}
(5)++ 3.05(10)
122m3Sb5112271Antimony-122m3121.9051681(28) u
[121.8771922 u]
{-88.33535 MeV}
(8)-
123Sb5112372Antimony-123122.90421(2) u
[122.8762341 u]
{-89.22781 MeV}
7/2++ 2.5457(12)123Sn
123Te
124Sb5112473Antimony-124123.9059358(16) u
[123.8779599 u]
{-87.62024 MeV}
3-1.20(2)
124m1Sb5112473Antimony-124m1123.9059358(16) u
[123.8779599 u]
{-87.62024 MeV}
5+
124m2Sb5112473Antimony-124m2123.9059358(16) u
[123.8779599 u]
{-87.62024 MeV}
(8)-
124m3Sb5112473Antimony-124m3123.9059358(16) u
[123.8779599 u]
{-87.62024 MeV}
3+,4++2.970(33)
125Sb5112574Antimony-125124.9052530(28) u
[124.8772771 u]
{-88.25626 MeV}
7/2++ 2.63(4)125Sn
126Sb5112675Antimony-126125.90725(3) u
[125.8792741 u]
{-86.39607 MeV}
(8-)1.28(7)126Sn
126m1Sb5112675Antimony-126m1125.90725(3) u
[125.8792741 u]
{-86.39607 MeV}
(5+)
126m2Sb5112675Antimony-126m2125.90725(3) u
[125.8792741 u]
{-86.39607 MeV}
(3-)
126m3Sb5112675Antimony-126m3125.90725(3) u
[125.8792741 u]
{-86.39607 MeV}
(3+)
127Sb5112776Antimony-127126.906924(6) u
[126.8789481 u]
{-86.69974 MeV}
7/2+2.70(4)127Sn
127m1Sb5112776Antimony-127m1126.906924(6) u
[126.8789481 u]
{-86.69974 MeV}
(15/2-)
127m2Sb5112776Antimony-127m2126.906924(6) u
[126.8789481 u]
{-86.69974 MeV}
128Sb5112877Antimony-128127.909146(21) u
[127.8811701 u]
{-84.62996 MeV}
8-1.31(2)128Sn
128mSb5112877Antimony-128m127.909146(21) u
[127.8811701 u]
{-84.62996 MeV}
5+
129Sb5112978Antimony-129128.909147(23) u
[128.8811711 u]
{-84.62902 MeV}
7/2+2.79(4)129Sn
129m1Sb5112978Antimony-129m1128.909147(23) u
[128.8811711 u]
{-84.62902 MeV}
(19/2-)
129m2Sb5112978Antimony-129m2128.909147(23) u
[128.8811711 u]
{-84.62902 MeV}
(15/2-)
130Sb5113079Antimony-130129.911663(15) u
[129.8836871 u]
{-82.28539 MeV}
(8-)130Sn
130mSb5113079Antimony-130m129.911663(15) u
[129.8836871 u]
{-82.28539 MeV}
(4,5)+
131Sb5113180Antimony-131130.9119893(22) u
[130.8840134 u]
{-81.98144 MeV}
(7/2+)2.89(4)131Sn
131m1Sb5113180Antimony-131m1130.9119893(22) u
[130.8840134 u]
{-81.98144 MeV}
(15/2-)
131m2Sb5113180Antimony-131m2130.9119893(22) u
[130.8840134 u]
{-81.98144 MeV}
(19/2-)
131m3Sb5113180Antimony-131m3130.9119893(22) u
[130.8840134 u]
{-81.98144 MeV}
(23/2+)
132Sb5113281Antimony-132131.9145080(26) u
[131.8865321 u]
{-79.63529 MeV}
(4)+132Sn
133Sn
248Cm
132m1Sb5113281Antimony-132m1131.9145080(26) u
[131.8865321 u]
{-79.63529 MeV}
(8-)
133Sb5113382Antimony-133132.915272(3) u
[132.8872961 u]
{-78.92362 MeV}
(7/2+)3.00(4)133Sn
134Sb5113483Antimony-134133.9205357(18) u
[133.8925598 u]
{-74.02052 MeV}
(0-)134Sn
135Sn
248Cm
134mSb5113483Antimony-134m133.9205357(18) u
[133.8925598 u]
{-74.02052 MeV}
(7-)
135Sb5113584Antimony-135134.9251844(28) u
[134.8972085 u]
{-69.69028 MeV}
(7/2+)135Sn
136Sn
248Cm
136Sb5113685Antimony-136135.930749(6) u
[135.9027731 u]
{-64.50689 MeV}
(1-)
137Sb5113786Antimony-137136.93552(6) u
[136.9075441 u]
{-60.06273 MeV}
(7/2+)
138Sb5113887Antimony-138137.94179(114) u
[137.9138141 u]
{-54.22227 MeV}
(3-)
139Sb5113988Antimony-139138.94655(43) u
[138.9185741 u]
{-49.78835 MeV}
(7/2+)
140Sb5114089Antimony-140139.95283(64) u
[139.9248541 u]
{-43.93857 MeV}
(3-,4-)
141Sb5114190Antimony-141140.95801(54) u
[140.9300341 u]
{-39.11343 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
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) ns93.99(5) keV
Sb-116m260.3(6) minEC/β+116Sn100 %383(40) keV
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) μs50.814(21) s
Sb-118m25.00(2) hEC/β+118Sn100 %250(6) keV
Sb-11938.19(22) hEC → 119Sn100 %0.591(8) MeVAL
Sb-119m1130(3) ns2553.6(3) keV
Sb-119m20.85(9) sIso → 119Sb100 %2841.7+x keV
Sb-12015.89(4) minEC/β+120Sn100 %2.681(7) MeVAL
Sb-120m15.76(2) dEC/β+120Sn100 %+x keV
Sb-120m2246(2) ns78.16(5) keV
Sb-120m3400(8) ns2328.3+x keV
Sb-121stableAL
Sb-121m179(6) μsIso → 121Sb100 %2721.5+x keV
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) μs61.4131(5) keV
Sb-122m20.53(3) msIso → 122Sb100 %137.4726(8) keV
Sb-122m34.191(3) minIso → 122Sb100 %163.5591(17) keV
Sb-123stableAL
Sb-12460.20(3) dβ-124Te100 %2.90507(13) MeVAL
Sb-124m193(5) sβ-124Te
Iso → 124Sb
25(5) %
75(5) %

10.8627(8) keV
Sb-124m220.2(2) minIso → 124Sb100 %36.8440(14) keV
Sb-124m33.2(3) μs40.8038(7) keV
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) %

17.7(3) keV
Sb-126m211 sIso → 126Sb100 %40.4(3) keV
Sb-126m3553(5) ns104.6(3) keV
Sb-1273.85(5) dβ-127Te100 %1.582(5) MeVAL
Sb-127m111(7) μs1920.19(21) keV
Sb-127m20.165(20) μs2324.7(4) keV
Sb-1289.05(4) hβ-128Te100 %4.363(19) MeVAL
Sb-128m10.41(18) minβ-128Te
Iso → 128Sb
96.4 %
3.6 %

+x keV
Sb-1294.366(26) hβ-129Te100 %2.375(21) MeVAL
Sb-129m117.7(1) minβ-129Te
Iso → 129Sb
85 %
15 %

1851.31(6) keV
Sb-129m22.2(2) μsIso → 129Sb1861.06(5) keV
Sb-13039.5(8) minβ-130Te100 %5.067(14) MeVAL
Sb-130m6.3(2) minβ-130Te100 %4.8(2) keV
Sb-13123.03(4) minβ-131Te100 %3.2296(21) MeVAL
Sb-131m191(4) μs1676.06(6) keV
Sb-131m24.3(8) μs1687.2(9) keV
Sb-131m31.1(2) μs2165.6(15) keV
Sb-1322.79(7) minβ-132Te100 %5.553(4) MeVAL
Sb-132m14.10(5) minβ-132Te100 %+x keV
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) %

279(1) keV
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 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Antimony isotope.
6 - 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.
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 Antimony 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 Antimony 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)
121Sb
57,21(5) %
5/2+
+ 3,3580(16)6,4442-54,3(11)10,25510,16302
2,8101
123Sb
42,79(5) %
7/2+
+ 2,5457(12)3,4904- 69,2(14)5,55320,04659
2,7390

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 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.

 


Category: Isotopes

Last update: 05.07.2020



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