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Isotopes of Xenon

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

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

All atomic nuclei of the chemical element xenon are summarized under xenon isotopes; these consist of an atomic nucleus with 54 protons and in the uncharged state of 54 electrons. The difference between the individual xenon isotopes lies in the number of neutrons in the nucleus.

A total of 39 isotopes are known from the noble gas xenon, nine of which are part of the natural xenon isotope mixture.

 

Naturally Occurring Xenon Isotopes

The following table provides information about the natural isotope composition of xenon:

Atomic Mass maQuantityHalf-lifeSpin
Xenon
Isotopic mixture		131,293 u100 %
Isotope 124Xe123,90589(2) u0,095(5) %> 1.8 × 1022 a0+
Isotope 126Xe125,90430(3) u0,089(3) %stable0+
Isotope 128Xe127,903531(7) u1,910(13) %stable0+
Isotope 129Xe128,90478086(4) u26,401(138) %stable1/2+
Isotope 130Xe129,9035094(1) u4,071(22) %stable0+
Isotope 131Xe130,905084(2) u21,232(51) %stable3/2+
Isotope 132Xe131,90415509(4) u26,909(55) %stable0+
Isotope 134Xe133,905393033(10) u10,436(35) %5.8 × 1022 a0+
Isotope 136Xe135,90721448(7) u8,857(72) %2.165(61) × 1021 a0+

 

In addition, 26 other, but unstable, radioactive xenon isotopes are known.

 

Isotope Table: Xenon

The two following tables list the most important data and properties of the Xenon isotopes. Further information on the individual Xenon 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
Xenon-10910954Xe55108.95043(32) u
[108.9208086 u]
{-46.17416 MeV}		(7/2+)
Xenon-11011054Xe56109.94426(11) u
[109.9146386 u]
{-51.92148 MeV}		0+114Ba
Xenon-11111154Xe57110.94160(9) u
[110.9119786 u]
{-54.39925 MeV}
Xenon-11211254Xe58111.935559(9) u
[111.9059376 u]
{-60.0264 MeV}		0+
Xenon-11311354Xe59112.933222(7) u
[112.9036006 u]
{-62.20331 MeV}		(5/2+)
Xenon-11411454Xe60113.927980(12) u
[113.8983586 u]
{-67.0862 MeV}		0+114Cs
Xenon-11511554Xe61114.926294(13) u
[114.8966726 u]
{-68.6567 MeV}		(5/2+)
Xenon-11611654Xe62115.921581(14) u
[115.8919596 u]
{-73.04683 MeV}		0+116Cs
Xenon-11711754Xe63116.920359(11) u
[116.8907376 u]
{-74.18511 MeV}		5/2(+)117Cs
Xenon-11811854Xe64117.916179(11) u
[117.8865576 u]
{-78.07876 MeV}		0+118Cs
Xenon-11911954Xe65118.915411(11) u
[118.8857896 u]
{-78.79415 MeV}		(5/2+)119Cs
Xenon-12012054Xe66119.911784(13) u
[119.8821626 u]
{-82.17267 MeV}		0+120Cs
Xenon-12112154Xe67120.911453(11) u
[120.8818316 u]
{-82.481 MeV}		5/2(+)121Cs
Xenon-12212254Xe68121.908368(12) u
[121.8787466 u]
{-85.35466 MeV}		0+122Cs
Xenon-12312354Xe69122.908482(10) u
[122.8788606 u]
{-85.24847 MeV}		(1/2)+123Cs
Xenon-12412454Xe70123.90589(2) u
[123.8762686 u]
{-87.6629 MeV}		0+124Cs
Xenon-12512554Xe71124.906394(2) u
[124.8767726 u]
{-87.19343 MeV}		1/2(+)125Cs
Xenon-125m1125m154Xe71124.906394(2) u
[124.8767726 u]
{-87.19343 MeV}		9/2(-)
Xenon-125m2125m254Xe71124.906394(2) u
[124.8767726 u]
{-87.19343 MeV}		7/2(+)
Xenon-12612654Xe72125.90430(3) u
[125.8746786 u]
{-89.14398 MeV}		0+126Cs
126I
Xenon-12712754Xe73126.905184(4) u
[126.8755626 u]
{-88.32054 MeV}		1/2+127Cs
Xenon-127m127m54Xe73126.905184(4) u
[126.8755626 u]
{-88.32054 MeV}		9/2-
Xenon-12812854Xe74127.903531(7) u
[127.8739096 u]
{-89.86029 MeV}		0+128Cs
128I
Xenon-12912954Xe75128.90478086(4) u
[128.8751595 u]
{-88.69606 MeV}		1/2+129Cs
129I
Xenon-129m129m54Xe75128.90478086(4) u
[128.8751595 u]
{-88.69606 MeV}		11/2-
Xenon-13013054Xe76129.9035094(1) u
[129.873888 u]
{-89.88041 MeV}		0+130Cs
130I
Xenon-13113154Xe77130.905084(2) u
[130.8754626 u]
{-88.41368 MeV}		3/2+131Cs
131I
Xenon-131m131m54Xe77130.905084(2) u
[130.8754626 u]
{-88.41368 MeV}		11/2-
Xenon-13213254Xe78131.90415509(4) u
[131.8745337 u]
{-89.27896 MeV}		0+132Cs
132I
Xenon-132m132m54Xe78131.90415509(4) u
[131.8745337 u]
{-89.27896 MeV}		(10+)
Xenon-13313354Xe79132.9059107(26) u
[132.8762893 u]
{-87.64362 MeV}		3/2+133I
Xenon-133m133m54Xe79132.9059107(26) u
[132.8762893 u]
{-87.64362 MeV}		11/2-
Xenon-13413454Xe80133.905393033(10) u
[133.8757716 u]
{-88.12582 MeV}		0+134Cs
134I
Xenon-134m134m54Xe80133.905393033(10) u
[133.8757716 u]
{-88.12582 MeV}		7-
Xenon-13513554Xe81134.907232(4) u
[134.8776106 u]
{-86.41284 MeV}		3/2+135I
Xenon-135m135m54Xe81134.907232(4) u
[134.8776106 u]
{-86.41284 MeV}		11/2-
Xenon-13613654Xe82135.90721448(7) u
[135.8775931 u]
{-86.42916 MeV}		0+136I
137I
248Cm
252Cf
Xenon-136m136m54Xe82135.90721448(7) u
[135.8775931 u]
{-86.42916 MeV}		6+
Xenon-13713754Xe83136.91155777(11) u
[136.8819364 u]
{-82.38341 MeV}		7/2-137I
138I
248Cm
Xenon-13813854Xe84137.914146(3) u
[137.8845246 u]
{-79.97249 MeV}		0+138I
139I
248Cm
252Cf
Xenon-13913954Xe85138.9187922(23) u
[138.8891708 u]
{-75.64458 MeV}		3/2-139I
248Cm
252Cf
Xenon-14014054Xe86139.9216458(25) u
[139.8920244 u]
{-72.98647 MeV}		0+140I
252Cf
Xenon-14114154Xe87140.926787(4) u
[140.8971656 u]
{-68.19747 MeV}		5/2(-)141I
248Cm
Xenon-14214254Xe88141.9299731(29) u
[141.9003517 u]
{-65.22964 MeV}		0+248Cm
Xenon-14314354Xe89142.935370(5) u
[142.9057486 u]
{-60.20246 MeV}		5/2-248Cm
Xenon-14414454Xe90143.938945(6) u
[143.9093236 u]
{-56.87237 MeV}		0+248Cm
144I
Xenon-14514554Xe91144.944720(12) u
[144.9150986 u]
{-51.49299 MeV}
Xenon-14614654Xe92145.948518(26) u
[145.9188966 u]
{-47.95517 MeV}		0+
Xenon-14714754Xe93146.95452(21) u
[146.9248986 u]
{-42.36435 MeV}		(3/2-)
Xenon-14814854Xe94147.95856(32) u
[147.9289386 u]
{-38.60111 MeV}		0+

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Xe-10913(2) msα → 105Te100 %4.217(7) MeVAL
Xe-11093(3) msEC/β+ → 110I
ε, p → 109Te
α → 106Te		36(35) %
?
64(35) %		8.54(11) MeV

3.872(9) MeV		AL
Xe-1110.74(20) sα → 107Te
EC/β+ → 111I		ca. 8 %
?		3.72(5) MeV
10.56(9) MeV		AL
Xe-1122.7(8) sEC/β+ → 112I
α → 108Te		98.8(8) %
1.2(8) %		7.037(13) MeV
3.33(6) MeV		AL
Xe-1132.74(8) sEC/β+ → 113I
ε, p → 112Te
α → 109Te
β+, α → 109Sb		92.98 %
7(4) %
0.011 %
0.007(4) %		8.916(11) MeV

3.087(8) MeV
AL
Xe-11410.0(4) sEC/β+ → 114I100 %5.71(15) MeVAL
Xe-11518(4) sEC/β+ → 115I
β+, p → 114Te
α → 111Te		99.65 %
0.34(6) %
0.0003(1) %		7.68(3) MeV

2.506(14) MeV		AL
Xe-11659(2) sEC/β+ → 116I100 %4.45(10) MeVAL
Xe-11761(2) sEC/β+ → 117I
β+, p → 116Te		99.98 %
0.0029 %		6.251(28) MeV
AL
Xe-1183.8(9) minEC/β+ → 118I100 %2.892(22) MeVAL
Xe-1195.8(3) minEC/β+ → 119I100 %4.97(3) MeVAL
Xe-12040(1) minEC/β+ → 120I100 %1.581(19) MeVAL
Xe-12140.1(20) minEC/β+ → 121I100 %3.770(12) MeVAL
Xe-12220.1(1) hEC → 122I100 %0.725(12) MeVAL
Xe-1232.08(2) hEC/β+ → 123I100 %2.695(10) MeVAL
Xe-124> 1.8 × 1022 a2 β → 124Te
2νEC/EC 124Te		?
?
AL
Xe-12516.9(2) hEC/β+ → 125I100 %1.6438(24) MeVAL
Xe-125m157(1) sIso → 125Xe100 %AL
Xe-125m20.14(3) μsAL
Xe-126stableAL
Xe-12736.346(3) dEC → 127I100 %0.662(5) MeVAL
Xe-127m69.2(9) sIso → 127Xe100 %0.2971(8) MeVAL
Xe-128stableAL
Xe-129stableAL
Xe-129m8.88(2) dIso → 129Xe100 %AL
Xe-130stableAL
Xe-131stableAL
Xe-131m11.84(4) dIso → 131Xe100 %AL
Xe-132stableAL
Xe-132m8.39(11) msIso → 132Xe100 %AL
Xe-1335.2475(5) dβ- → 133Cs100 %0.4274(24) MeVAL
Xe-133m2.198(13) dIso → 133Xe100 %AL
Xe-1345.8 × 1022 a2 β- → 134Ba> 0 %AL
Xe-134m290(17) msIso → 134Xe100 %AL
Xe-1359.14(2) hβ- → 135Cs100 %1.168(4) MeVAL
Xe-135m15.29(5) minIso → 135Xe
β- → 135Cs		> 99.4 %
< 0.6 %
AL
Xe-1362.165(61) × 1021 a2 β- → 136Ba100 %AL
Xe-136m2.95(17) μsIso → 136Xe100 %AL
Xe-1373.818(13) minβ- → 137Cs100 %4.41624(3) MeVAL
Xe-13814.14(7) minβ- → 138Cs100 %2.915(10) MeVAL
Xe-13939.68(14) sβ- → 139Cs100 %5.056(4) MeVAL
Xe-14013.60(10) sβ- → 140Cs100 %4.064(9) MeVAL
Xe-1411.73(1) sβ- → 141Cs
β-, n → 140Cs		99.4 %
0.044(5) %		6.28(1) MeV
0.781(9) MeV		AL
Xe-1421.23(2) sβ- → 142Cs
β-, n → 141Cs		99.8 %
0.21(6) %		5.285(8) MeV
1.177(10) MeV		AL
Xe-143511(6) msβ- → 143Cs
β-, n → 142Cs		< 100 %
> 0 %		7.473(9) MeV
2.240(8) MeV		AL
Xe-1441.15(20) sβ- → 144Cs100 %6.399(21) MeVAL
Xe-145188(4) msβ- → 145Cs
β-, n → 144Cs		95 %
5.0(6) %		8.561(14) MeV
3.707(23) MeV		AL
Xe-146146(6) msβ- → 146Cs
β-, n → 145Cs		100 %
6.9(15) %		7.355(24) MeV
4.028(26) MeV		AL
Xe-1470.10 sβ- → 147Cs
β-, n → 146Cs		?
< 8 %		9.56(20) MeV
4.88(20) MeV		AL
Xe-1484 μsβ- → 148Cs
β-, n → 147Cs		?
?		8.31(30) MeV
5.25(30) MeV		AL

 

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 Xenon 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 Xenon 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 Xenon 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)
129Xe
26,401(138) %
1/2+		-0,777961(16)7,4521
{}		11,86040,02162
0,2786
131Xe
21,232(51) %
3/2+		+0,691845(7)2,2091
{- 11,46(11)}		3,51590,00282
0,4129

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q fm-2

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 Xenon radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Xe-120109 Bq100 Bq/g40.0 min
Xe-121109 Bq100 Bq/g38.8 min
Xe-122+109 Bq100 Bq/gI-12220.1 h
Xe-123109 Bq100 Bq/g2.1 h
Xe-125109 Bq1000 Bq/g16.8 h
Xe-127105 Bq1000 Bq/g0,3 TBq36.4 d
Xe-129m104 Bq1000 Bq/g8.9 d
Xe-131m104 Bq10000 Bq/g4 × 1011 Bq11.9 d
Xe-133104 Bq1000 Bq/g2 × 1011 Bq5.3 d
Xe-133m104 Bq1000 Bq/g2.2 d
Xe-1351010 Bq1000 Bq/g9.1 h
Xe-135m109 Bq100 Bq/g15.3 min
Xe-138109 Bq100 Bq/g14.1 min

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

 

Literature Sources and References

Properties of the Xenon 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.

Xenon: NMR properties - 129Xe-NMR, 131Xe-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.

 

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