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Isotopes of Iodine

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

 

Iodine isotopes

Of the 37 known isotopes, the chemical element iodine occurs in nature only in the form of the stable isotope iodine-127 - there are also small traces of iodine-129 from cosmogenic and anthropogenic sources.

The standard atomic mass of iodine is 126.90447(3) u.

 

Isotope Table: Iodine

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
108I5310855Iodine-108107.94348(14) u
[107.9144071 u]
{-52.64804 MeV}
(1)
109I5310956Iodine-109108.938086(7) u
[108.9090131 u]
{-57.67252 MeV}
(1/2+,3/2+)
110I5311057Iodine-110109.93509(5) u
[109.9060171 u]
{-60.46328 MeV}
(1+)110Xe
114Cs
111I5311158Iodine-111110.930269(5) u
[110.9011961 u]
{-64.95401 MeV}
(5/2+)
112I5311259Iodine-112111.928005(11) u
[111.8989321 u]
{-67.06291 MeV}
(1+)112Xe
113I5311360Iodine-113112.923650(9) u
[112.8945771 u]
{-71.11957 MeV}
5/2+114Cs
114I5311461Iodine-114113.92185(16) u
[113.8927771 u]
{-72.79626 MeV}
1+114Xe
114mI5311461Iodine-114m113.92185(16) u
[113.8927771 u]
{-72.79626 MeV}
(7)
115I5311562Iodine-115114.91805(3) u
[114.8889771 u]
{-76.33593 MeV}
(5/2+)115Xe
116I5311663Iodine-116115.91681(10) u
[115.8877371 u]
{-77.49099 MeV}
1+116Xe
116mI5311663Iodine-116m115.91681(10) u
[115.8877371 u]
{-77.49099 MeV}
(7-)
117I5311764Iodine-117116.913648(28) u
[116.8845751 u]
{-80.43637 MeV}
(5/2)+3.1(2)117Xe
118I5311865Iodine-118117.913074(21) u
[117.8840011 u]
{-80.97105 MeV}
2-2.0(2)118Xe
118mI5311865Iodine-118m117.913074(21) u
[117.8840011 u]
{-80.97105 MeV}
(7-)4.2(2)
119I5311966Iodine-119118.91007(3) u
[118.8809971 u]
{-83.76926 MeV}
5/2++ 2.9(1)119Xe
120I5312067Iodine-120119.910087(16) u
[119.8810141 u]
{-83.75342 MeV}
2-1.23120Xe
120m1I5312067Iodine-120m1119.910087(16) u
[119.8810141 u]
{-83.75342 MeV}
1+,2+,3+
120m2I5312067Iodine-120m2119.910087(16) u
[119.8810141 u]
{-83.75342 MeV}
(7-)4.2(2)
121I5312168Iodine-121120.907405(6) u
[120.8783321 u]
{-86.25169 MeV}
5/2+2.3(1)121Xe
121mI5312168Iodine-121m120.907405(6) u
[120.8783321 u]
{-86.25169 MeV}
122I5312269Iodine-122121.907589(6) u
[121.8785161 u]
{-86.08029 MeV}
1++ 0.94(3)122Xe
123I5312370Iodine-123122.905589(4) u
[122.8765161 u]
{-87.94328 MeV}
5/2+2.818(7)123Xe
124I5312471Iodine-124123.9062090(26) u
[123.8771361 u]
{-87.36575 MeV}
2-1.446(4)
125I5312572Iodine-125124.9046293(16) u
[124.8755564 u]
{-88.83723 MeV}
5/2+2.821(5)125Xe
126I5312673Iodine-126125.905623(4) u
[125.8765501 u]
{-87.91161 MeV}
2-1.438(4)
127I5312774Iodine-127126.90447(3) u
[126.8753971 u]
{-88.98562 MeV}
5/2++2.8087(14)127Xe
127Te
128I5312875Iodine-128127.905809(4) u
[127.8767361 u]
{-87.73835 MeV}
1+
128m1I5312875Iodine-128m1127.905809(4) u
[127.8767361 u]
{-87.73835 MeV}
4--0.72(3)
128m2I5312875Iodine-128m2127.905809(4) u
[127.8767361 u]
{-87.73835 MeV}
(6)-
129I5312976Iodine-129128.904984(3) u
[128.8759111 u]
{-88.50683 MeV}
7/2++2.6165(14)129Te
130I5313077Iodine-130129.906670(3) u
[129.8775971 u]
{-86.93634 MeV}
5+3.349(7)
130m1I5313077Iodine-130m1129.906670(3) u
[129.8775971 u]
{-86.93634 MeV}
2+
130m2I5313077Iodine-130m2129.906670(3) u
[129.8775971 u]
{-86.93634 MeV}
(6)-
130m3I5313077Iodine-130m3129.906670(3) u
[129.8775971 u]
{-86.93634 MeV}
?
130m4I5313077Iodine-130m4129.906670(3) u
[129.8775971 u]
{-86.93634 MeV}
(6)--0.29(3)
131I5313178Iodine-131130.9061264(6) u
[130.8770535 u]
{-87.4427 MeV}
7/2++ 2.738(1)131Te
132I5313279Iodine-132131.907994(4) u
[131.8789211 u]
{-85.70304 MeV}
4+3.088(7)132Te
132mI5313279Iodine-132m131.907994(4) u
[131.8789211 u]
{-85.70304 MeV}
(8-)
133I5313380Iodine-133132.907827(7) u
[132.8787541 u]
{-85.8586 MeV}
7/2++ 2.856(5)133Te
133m1I5313380Iodine-133m1132.907827(7) u
[132.8787541 u]
{-85.8586 MeV}
(19/2-)
133m2I5313380Iodine-133m2132.907827(7) u
[132.8787541 u]
{-85.8586 MeV}
(15/2-)
133m3I5313380Iodine-133m3132.907827(7) u
[132.8787541 u]
{-85.8586 MeV}
(19/2+)
133m4I5313380Iodine-133m4132.907827(7) u
[132.8787541 u]
{-85.8586 MeV}
(23/2+)
134I5313481Iodine-134133.909776(5) u
[133.8807031 u]
{-84.04311 MeV}
(4)+134Te
134mI5313481Iodine-134m133.909776(5) u
[133.8807031 u]
{-84.04311 MeV}
(8)-
135I5313582Iodine-135134.9100594(22) u
[134.8809865 u]
{-83.77913 MeV}
7/2++2.940(2)135Te
136Te
248Cm
136I5313683Iodine-136135.914605(15) u
[135.8855321 u]
{-79.54493 MeV}
(1-)136Te
137Te
248Cm
252Cf
136mI5313683Iodine-136m135.914605(15) u
[135.8855321 u]
{-79.54493 MeV}
(6-)
137I5313784Iodine-137136.918028(9) u
[136.8889551 u]
{-76.35643 MeV}
(7/2+)137Te
248Cm
138I5313885Iodine-138137.922726(6) u
[137.8936531 u]
{-71.98027 MeV}
(1-)138Te
138mI5313885Iodine-138m137.922726(6) u
[137.8936531 u]
{-71.98027 MeV}
(3-)
139I5313986Iodine-139138.926493(4) u
[138.8974201 u]
{-68.47133 MeV}
(7/2+)139Te
140I5314087Iodine-140139.931716(13) u
[139.9026431 u]
{-63.60614 MeV}
(4-)140Te
141I5314188Iodine-141140.935666(17) u
[140.9065931 u]
{-59.92673 MeV}
141Te
142I5314289Iodine-142141.9412(4) u
[141.9121271 u]
{-54.77185 MeV}
142Te
143I5314390Iodine-143142.94565(21) u
[142.9165771 u]
{-50.6267 MeV}
144I5314491Iodine-144143.95139(43) u
[143.9223171 u]
{-45.27992 MeV}
145I5314592Iodine-145144.95605(54) u
[144.9269771 u]
{-40.93916 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
I-10836(6) msα → 104Sb
EC/β+108Te
p → 107Te
91(15) %
9 %
< 1 %
4.10(5) MeV
13.13(13) MeV
AL
I-10992.8(8) μsp → 108Te
α → 105Sb
99.986(4) %
0.014(4) %

3.918(21) MeV
AL
I-110664(24) msEC/β+110Te
α → 106Sb
EC, p → 109Sb
EC, α → 106Sn
83(4) %
17(4) %
11(3) %
1.09 %
11.77(5) MeV
3.58(5) MeV

AL
I-1112.5(2) sEC/β+111Te
α → 107Sb
99.9 %
0.1 %
8.634(8) MeV
3.275(5) MeV
AL
I-1123.34(8) sEC/β+112Te
EC, p → 111Sb
EC, α → 109Sn
α → 108Sb
99.01 %
0.88 %
0.104 %
0.0012 %
10.504(13) MeV


2.957(12) MeV
AL
I-1136.6(2) sα → 109Sb
EC/β+109Sn
selten
~100 %
2.707(10) MeV
7.228(29) MeV
AL
I-1142.1(2) sEC/β+114Te
β+, p → 113Sb
100 %
?
9.09(15) MeV
AL
I-114m6.2(5) sEC/β+114Te
Iso 114I
91(2) %
9(2) %

265.9 keV
I-1151.3(2) minEC/β+115Te100 %5.72(5) MeVAL
I-1162.91(15) sEC/β+116Te7.78(10) MeVAL
I-116m3.27 μsIso → 116I100 %430.4(5) keV
I-1172.22(4) minEC/β+117Te100 %4.659(29) MeVAL
I-11813.7(5) minEC/β+118Te6.726(27) MeVAL
I-118m8.5(5) minEC/β+118Te
Iso → 118I
< 100 %
> 100 %

190.1(10) keV
I-11919.1(4) minβ+119Te
EC → 119Te
51(4) %
49(4) %
3.416(29) MeV
AL
I-12081.6(2) minEC/β+120Te100 %5.615(16) MeVAL
I-120m1228(15) ns72.61(9) keV
I-120m253(4) minEC/β+120Te100 %320 keV
I-1212.12(1) hEC/β+121Te100 %2.294(26) MeVAL
I-121m9.0(14) μs2376.9(4) keV
I-1223.63(6) minEC/β+122Te100 %4.234(5) MeVAL
I-12313.2235(19) hEC/β+123Te100 %1.228(4) MeVAL
I-1244.1760(3) dEC/β+124Te100 %3.1596(28) MeVAL
I-12559.407(10) dEC → 125Te100 %0.1858(21) MeVAL
I-12612.93(5) dEC/β+126Te
β-126Xe
52.7(5) %
44.3(5) %
2.154(4) MeV
1.236(5) MeV
AL
I-127stableAL
I-12824.99(2) minβ-128Xe
EC/β+128Te
93.1(8) %
6.9(8) %
2.122(4) MeV
1.255(4) MeV
AL
I-128m10.845(20) μs137.851(3) keV
I-128m2175(15) ns167.368(4) keV
I-1291.57(4) × 107 aβ-129Xe100 %0.189(3) MeVAL
I-13012.36(1) hβ-130Xe100 %2.944(3) MeVAL
I-130m18.84(6) minβ-130Xe
Iso → 130I
16(2) %
84(2) %
~ 3 MeV
39.9525(13) keV
I-130m2133(7) ns69.5865(7) keV
I-130m3315(15) ns82.3960(19) keV
I-130m4254(4) ns85.1099(10) keV
I-1318.0252(6) dβ-131Xe100 %0.9708(6) MeVAL
I-1322.295(13) hβ-132Xe100 %3.575(4) MeVAL
I-132m1.387(15) hβ-132Xe
Iso 132I
14(2) %
86(2) %

120(20) keV
I-13320.83(8) hβ-133Xe100 %1.785(7) MeVAL
I-133m19(2) sIso 133I100 %1634.148(10) keV
I-133m2170 ns1729.137(10) keV
I-133m30.78(16) μs2435.00(23) keV
I-133m4469(15) ns2493.7(4) keV
I-13452.5(2) minβ-134Xe100 %4.082(5) MeVAL
I-134m3.52(4) minβ-134Xe
Iso 134I
2.3 %
97.7 %
~ 4 MeV
0.316 MeV
316.49(22) keV
I-1356.58(3) hβ-135Xe100 %2.634(4) MeVAL
I-13683.4(10) sβ-136Xe100 %6.884(14) MeVAL
I-136m46.6(11) sβ-136Xe100 %201(26) keV
I-13724.5(2) sβ-137Xe
β- →, n 136Xe
92.86 %
7.14 %
6.027(8) MeV
2.002(8) MeV
AL
I-1386.26(3) sβ-138Xe
β- →, n 137Xe
94.54 %
5.46 %
7.992(7) MeV
2.332(6) MeV
AL
I-138m1.26(16) μsIso → 138I100 %67.9(3) keV
I-1392.280(11) sβ-139Xe
β- →, n 138Xe
90 %
10.0(3) %
7.174(5) MeV
3.430(5) MeV
AL
I-1400.86(4) sβ-140Xe
β-, n → 139Xe
92.40 %
7.60(28) %
9.380(12) MeV
3.967(13) MeV
AL
I-1410.43(2) sβ-141Xe
β- →, n 140Xe
78.8 %
21.2 %
8.271(16) MeV
4.988(16) MeV
AL
I-142222(12) msβ-142Xe
β- →, n 141Xe
75 %
25 %
10.46(37) MeV
5.36(37) MeV
AL
I-143130(45) msβ-143Xe?AL
I-144300 nsβ-144Xe?11.59(40) MeVAL
I-145407 nsβ-145Xe
β-, n → 144Xe
?
?
10.55(50) MeV
7.86(50) 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 Iodine isotope.
6 - Relative atomic mass of the Iodine 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 Iodine 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 Iodine 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)
127I
100 %
5/2+
+2,8087(14)5,3817- 68,8228,57780,09540
2,3504

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 Iodine radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
I-120105 Bq10 Bq/g1.4 h
I-120m105 Bq10 Bq/g53.0 min
I-121106 Bq100 Bq/g2.1 h
I-123107 Bq100 Bq/g0,5 TBq10 Bq cm-213.2 h
I-124106 Bq10 Bq/g0,06 TBq4.2 d
I-125106 Bq100 Bq/g0,2 TBq10 Bq cm-259.4 d
I-126106 Bq10 Bq/g0,1 TBq10 Bq cm-213.0 d
I-128105 Bq100 Bq/g25.0 min
I-129105 Bq100 Bq/gUnbegrenzt (UL)0,06 Bq/cm21.6 × 107 a
I-130106 Bq10 Bq/g1 Bq cm-212.4 h
I-131106 Bq10 Bq/g0,2 TBq10 Bq cm-28.0 d
I-132105 Bq10 Bq/g0,03 TBq1 Bq cm-22.3 h
I-132m106 Bq100 Bq/g83.0 min
I-133106 Bq10 Bq/g0,1 TBq10 Bq cm-2Xe133/133m20.8 h
I-134105 Bq10 Bq/g0,03 TBq1 Bq cm-252.5 min
I-135+106 Bq10 Bq/g0,04 TBq1 Bq cm-2Xe135/135m6.6 h

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

 

Literature Sources and References

Properties of the Iodine 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.

Iodine: NMR properties - 127I-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] - 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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