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Isotopes of Tellurium

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

 

Tellurium isotopes

All atomic nuclei of the chemical element tellurium are summarized under tellurium isotopes; these all consist of an atomic nucleus with 52 protons and, in the uncharged state, 52 electrons. The difference between each tellurium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Tellurium Isotopes

Natural terrestrial deposits of tellurium are composed of eight isotopes, five of which are considered to be stable and three of which decay with very long half-lives, releasing mild radioactive radiation. The two tellurium isotopes Te-128 and Te-130, which decay under double electron capture, provide the largest proportion at 32 and 34% above that of the heavier element iodine (126.90 u).

There are no technical applications for the individual telluride isotopes.

Atomic Mass maQuantityHalf-lifeSpin
Tellurium
Isotopic mixture
127,60 u100 %
Isotope 120Te119,90406(2) u0,09(1) %stable0+
Isotope 122Te121,90304(1) u2,55(12) %stable0+
Isotope 123Te122,90427(1) u0,89(3) %9.2 × 1016 a1/2+
Isotope 124Te123,90282(1) u4,74(14) %stable0+
Isotope 125Te124,90443(1) u7,07(15) %stable1/2+
Isotope 126Te125,90331(1) u18,84(25) %stable0+
Isotope 128Te127,904461(6) u31,74(8) %7.7(4) × 1024 a0+
Isotope 130Te129,90622275(8) u34,08(62) %0.79 × 1021 a0+

 

In addition to the natural Te isotopes, about 30 other unstable radionuclides of tellurium and several nuclear isomers are known.

 

Isotope Table: Tellurium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
105Te5210553Tellurium-105104.94330(32) u
[104.9147756 u]
{-52.81571 MeV}
(5/2+)
106Te5210654Tellurium-106105.93750(11) u
[105.9089756 u]
{-58.21838 MeV}
0+110Xe
107Te5210755Tellurium-107106.93501(8) u
[106.9064856 u]
{-60.5378 MeV}
111Xe
108Te5210856Tellurium-108107.92938(6) u
[107.9008556 u]
{-65.78211 MeV}
0+112Xe
109Te5210957Tellurium-109108.927305(5) u
[108.8987806 u]
{-67.71496 MeV}
(5/2+)113Xe
110Te5211058Tellurium-110109.922458(7) u
[109.8939336 u]
{-72.22991 MeV}
0+
111Te5211159Tellurium-111110.921001(7) u
[110.8924766 u]
{-73.58709 MeV}
(5/2)+
112Te5211260Tellurium-112111.916728(9) u
[111.8882036 u]
{-77.56737 MeV}
0+112I
113Te5211361Tellurium-113112.91589(3) u
[112.8873656 u]
{-78.34796 MeV}
(7/2+)113I
114Te5211462Tellurium-114113.91209(3) u
[113.8835656 u]
{-81.88764 MeV}
0+114I
115Te5211563Tellurium-115114.91190(3) u
[114.8833756 u]
{-82.06462 MeV}
7/2+115I
115mTe5211563Tellurium-115m114.91190(3) u
[114.8833756 u]
{-82.06462 MeV}
(1/2)+
116Te5211664Tellurium-116115.90846(3) u
[115.8799356 u]
{-85.26896 MeV}
0+116I
117Te5211765Tellurium-117116.908646(14) u
[116.8801216 u]
{-85.0957 MeV}
1/2+117I
117mTe5211765Tellurium-117m116.908646(14) u
[116.8801216 u]
{-85.0957 MeV}
(11/2-)
118Te5211866Tellurium-118117.905854(20) u
[117.8773296 u]
{-87.69643 MeV}
0+118I
119Te5211967Tellurium-119118.906407(9) u
[118.8778826 u]
{-87.18132 MeV}
1/2+0.25(5)
119mTe5211967Tellurium-119m118.906407(9) u
[118.8778826 u]
{-87.18132 MeV}
11/2-0.894(6)
120Te5212068Tellurium-120119.90406(2) u
[119.8755356 u]
{-89.36753 MeV}
0+120I
121Te5212169Tellurium-121120.904942(28) u
[120.8764176 u]
{-88.54596 MeV}
1/2+121I
121mTe5212169Tellurium-121m120.904942(28) u
[120.8764176 u]
{-88.54596 MeV}
11/2-0.895(10)
122Te5212270Tellurium-122121.90304(1) u
[121.8745156 u]
{-90.31766 MeV}
0+
123Te5212371Tellurium-123122.90427(1) u
[122.8757456 u]
{-89.17192 MeV}
1/2+-0.7358(3)123I
123mTe5212371Tellurium-123m122.90427(1) u
[122.8757456 u]
{-89.17192 MeV}
11/2-- 0.927(8)
124Te5212472Tellurium-124123.90282(1) u
[123.8742956 u]
{-90.52259 MeV}
0+124I
124Sb
125Te5212573Tellurium-125124.90443(1) u
[124.8759056 u]
{-89.02288 MeV}
1/2+-0.8870(5)125I
125Sb
125mTe5212573Tellurium-125m124.90443(1) u
[124.8759056 u]
{-89.02288 MeV}
11/2-- 0.985(6)
126Te5212674Tellurium-126125.90331(1) u
[125.8747856 u]
{-90.06615 MeV}
0+126I
126Sb
127Te5212775Tellurium-127126.9052257(16) u
[126.8767013 u]
{-88.28169 MeV}
3/2+0.635(4)127Sb
127mTe5212775Tellurium-127m126.9052257(16) u
[126.8767013 u]
{-88.28169 MeV}
11/2-- 1.041(6)
128Te5212876Tellurium-128127.904461(6) u
[127.8759366 u]
{-88.99401 MeV}
0+128Sb
128I
129Te5212977Tellurium-129128.9065965(9) u
[128.8780721 u]
{-87.0048 MeV}
3/2+0.702(4)129Sb
129mTe5212977Tellurium-129m128.9065965(9) u
[128.8780721 u]
{-87.0048 MeV}
11/2-- 1.091(7)
130Te5213078Tellurium-130129.90622275(8) u
[129.8776984 u]
{-87.35295 MeV}
0+130Sb
131Te5213179Tellurium-131130.90852221(6) u
[130.8799978 u]
{-85.21101 MeV}
3/2+0.696(9)131Sb
131mTe5213179Tellurium-131m130.90852221(6) u
[130.8799978 u]
{-85.21101 MeV}
11/2--1.123(7)
131m2Te5213179Tellurium-131m2130.90852221(6) u
[130.8799978 u]
{-85.21101 MeV}
(23/2+)
131m+Te5213179Tellurium-131m+
132Te5213280Tellurium-132131.908547(4) u
[131.8800226 u]
{-85.18792 MeV}
0+132Sb
252Cf
133Te5213381Tellurium-133132.9109633(22) u
[132.8824389 u]
{-82.93715 MeV}
(3/2+)0.85(2)133Sb
133mTe5213381Tellurium-133m132.9109633(22) u
[132.8824389 u]
{-82.93715 MeV}
(11/2-)(-) 1.129(7)
133m+Te5213381Tellurium-133m+
134Te5213482Tellurium-134133.9113964(29) u
[133.882872 u]
{-82.53372 MeV}
0+134Sb
235Sb
248Cm
135Te5213583Tellurium-135134.9165547(18) u
[134.8880303 u]
{-77.7288 MeV}
(7/2-)- 0.69(5)135Sb
136Sb
248Cm
252Cf
136Te5213684Tellurium-136135.9201012(24) u
[135.8915768 u]
{-74.42525 MeV}
0+136Sb
248Cm
252Cf
137Te5213785Tellurium-137136.9255994(23) u
[136.897075 u]
{-69.30371 MeV}
(7/2-)248Cm
138Te5213886Tellurium-138137.929472(4) u
[137.9009476 u]
{-65.69641 MeV}
0+248Cm
139Te5213987Tellurium-139138.935367(4) u
[138.9068426 u]
{-60.20525 MeV}
(7/2-)248Cm
140Te5214088Tellurium-140139.93926(7) u
[139.9107356 u]
{-56.57895 MeV}
0+
141Te5214189Tellurium-141
142Te5214290Tellurium-142141.95022(54) u
[141.9216956 u]
{-46.36977 MeV}
0+
143Te5214391Tellurium-143142.95676(54) u
[142.9282356 u]
{-40.2778 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Te-1050.62(7) μsα → 101Snca. 100 %5.069(3) MeVAL
Te-10670(17) μsα → 102Sn100 %4.290(9) MeVAL
Te-1073.1(1) msα → 103Sn
EC/β+107Sb
70(30) %
30(30) %
4.008(5) MeV
10.11(7) MeV
AL
Te-1082.1(1) sα → 104Sn
EC/β+108Sb
β+, p → 107Sb
49(9) %
51(4) %
2.4(10) %
3.420(8) MeV
6.664(8)
AL
Te-1094.4(2) sα → 105Sn
EC/β+109Sb
β+, p → 108Sb
β+, α → 105In
3.9(13) %
96.1(13) %
9.4(31) %
< 0.005 %
3.198(6) MeV
8.536(7) MeV

AL
Te-11018.6(8) sEC/β+110Sb
α → 106Sn
ca. 100 %
0.00067 %
5.220(9) MeV
2.699(8) MeV
AL
Te-11119.3(4) sEC/β+111Sb
β+, p → 110Sb
100 %
?
7.249(11) MeV
AL
Te-1122.0(2) minEC/β+112Sb100 %4.031(20) MeVAL
Te-1131.7(2) minEC/β+113Sb100 %6.07(3) MeVAL
Te-11415.2(7) minEC/β+114Sb100 %2.61(4) MeVAL
Te-1155.8(2) minEC/β+115Sb100 %4.94(3) MeVAL
Te-115m6.7(4) minEC/β+115Sb
Iso → 115Te
< 100 %
?

Te-1162.49(4) hEC/β+116Sb100 %1.553(28) MeVAL
Te-11762(2) minEC/β+117Sb
β+117Sb
75 %
25(1) %
3.544(16) MeV
?
AL
Te-117m103(3) msIso → 117Te100 %296.1 keV
Te-1186.00(2) dEC → 118Sb100 %0.300(19) MeVAL
Te-11916.05(5) hEC/β+119Sb
β+119Sb
97.04 %
2.06 %
2.293(11) MeV
?
AL
Te-119m4.70(4) dEC/β+119Sb
β+119Sb
Iso → 119Te
> 99 %
0.41(4) %
< 0.008 %


260.96(5) keV
Te-120stableAL
Te-12119.17(4) dEC/β+121Sb100 %1.055(26) MeVAL
Te-121m164.2(8) dEC/β+121Sb
Iso → 121Te
11.4(11) %
88.6(11) %

293.974(22) keV
Te-122stableAL
Te-1239.2 × 1016 aEC → 123Sb100 %0.0519(21) MeVAL
Te-123m119.2(1) dIso → 123Te100 %247.47(4) keV
Te-124stableAL
Te-125stableAL
Te-125m57.40(15) dIso → 125Te100 %144.775(8) keV
Te-126stableAL
Te-1279.35(7) hβ-127I100 %0.702(4) MeVAL
Te-127m106.1(7) dβ-127I
Iso → 127Te
2.4(2) %
97.6(2) %

88.23(7) keV
Te-1287.7(4) × 1024 a2 β-128Xe100 %AL
Te-12969.6(3) minβ-129I100 %1.502(3) MeVAL
Te-129m33.6(1) dβ-129I
Iso → 129Te
36(7) %
64(7) %

105.51(3) keV
Te-1300.79 × 1021 a2 β-130Xe100 %AL
Te-13125.0(1) minβ-131I100 %22.317(6) MeVAL
Te-131m33.25(25) hβ-131I
Iso → 131Te
74.1(5) %
25.9(5) %

182.258(18) keV
Te-131m293(12) msIso → 131Te100 %1940.0(4) keV
Te-131m+
Te-1323.204(13) dβ-132I100 %0.515(3) MeVAL
Te-13312.5(3) minβ-133I100 %2.921(7) MeVAL
Te-133m55.4(4) minβ-133I
Iso → 133Te
83.5(20) %
16.5(20) %

334.26(4) keV
Te-133m+
Te-13441.8(8) minβ-134I100 %1.510(5) MeVAL
Te-13519.0(2) sβ-135I100 %6.0504(27) MeVAL
Te-13617.63(8) sβ-136I
β-, n → 135I
98.69 %
1.31 %
5.120(14) MeV
1.283(3) MeV
AL
Te-1372.49(5) sβ-137I
β-, n → 136I
97.01 %
2.99 %
7.053(9) MeV
2.170(4) MeV
AL
Te-1381.4(4) sβ-138I
β-, n → 137I
93.7 %
6.3 %
6.284(7) MeV
2.589(9) MeV
AL
Te-1391.6(3) sβ-129I
β-, n → 128I
100 %
?
8.266(5) MeV
3.704(7) MeV
AL
Te-140β-140I
β-, n → 139I
100 %
?
7.03(6) MeV
3.82(6) MeV
AL
Te-141- ungelistet -AL
Te-142AL
Te-143408 nsβ-143I
β-, n → 142I
β-, 2n → 141I
?
?
?
10.35(54) MeV
6.42(63) MeV
AL

 

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 Tellurium isotope.
6 - Relative atomic mass of the Tellurium 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 Tellurium 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 Tellurium 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)
123Te
0,89(3) %
1/2+
-0,7358(3)7,057611,23490,01837
0,2639
125Te
7,07(15) %
1/2+
-0,8870(5)8,508713,54460,03219
0,3181

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 Tellurium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Te-116+107 Bq100 Bq/g2.5 h
Te-121106 Bq10 Bq/g0,1 TBq19.2 d
Te-121m106 Bq1 Bq/g0,1 TBq154.0 d
Te-123106 Bq0,1 Bq/g> 9.2 × 1016 a
Te-123m107 Bq100 Bq/g8 × 1010 Bq10 Bq/cm2119.7 d
Te-125m107 Bq1000 Bq/g10 TBq100 Bq cm-257.4 d
Te-127106 Bq1000 Bq/g10 TBq100 Bq cm-29.4 h
Te-127m+107 Bq10 Bq/g3 TBq100 Bq cm-2Te-127109.0 d
Te-129106 Bq100 Bq/g1 TBq10 Bq cm-269.6 min
Te-129m+106 Bq10 Bq/g1 TBq10 Bq cm-2Te-12933.6 d
Te-131105 Bq100 Bq/g10 Bq cm-225.0 min
Te-131m+106 Bq10 Bq/g0,04 TBq1 Bq cm-230.0 h
Te-132107 Bq100 Bq/g5 × 109 Bq1 Bq/cm276.3 h
Te-133105 Bq10 Bq/g1 Bq cm-212.5 min
Te-133m+105 Bq10 Bq/g1 Bq cm-255.4 min
Te-134106 Bq10 Bq/g1 Bq cm-241.8 min

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

 

Literature Sources and References

Properties of the Tellurium 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.

Tellurium: NMR properties - 123Te-NMR, 125Te-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] - A. Alessandrello et al.:
New limits on naturally occurring electron capture of 123Te.
In: Physical Review C, (2003), DOI 10.1103/PhysRevC.67.014323.

[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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