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Isotopes of Cadmium

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

 

Cadmium isotopes

All atomic nuclei of the chemical element cadmium are summarized under cadmium isotopes; these all consist of an atomic nucleus with 48 protons and, in the uncharged state, 48 electrons. The difference between each cadmium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Cadmium Isotopes

The natural terrestrial cadmium deposits are made up of a total of 8 different isotopes, six of which are considered to be stable and two of which slowly decay with very long half-lives:

Atomic Mass maQuantityHalf-lifeSpin
Cadmium
Isotopic mixture
112,414 u100 %
Isotope 106Cd105,906460(8) u1,245(22) %stable0+
Isotope 107Cd106,9066121(18) u6.50(2) h5/2+
Isotope 110Cd109,903007(4) u12,470(61) %stable0+
Isotope 111Cd110,904183(4) u12,795(12) %stable1/2+
Isotope 112Cd111,902763(4) u24,109(7) %stable0+
Isotope 113Cd112,904408(3) u12,227(7) %8.04(5) × 1015 a1/2+
Isotope 114Cd113,903365(3) u28,754(81) %stable0+
Isotope 116Cd115,904763(2) u7,512(54) %3.3(4) × 1019 a0+

 

In addition to the natural isotopes, 31 other nuclides of cadmium are known.

All other known and characterized cadmium nuclides are unstable; with a half-life of 6.5 million years, the cadmium isotope 107 is the longest-lived radioisotope.

 

Isotope Table: Cadmium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
94Cd489446Cadmium-9493.95691(54) u
[93.9305796 u]
{-40.13808 MeV}
0+
95Cd489547Cadmium-95
96Cd489648Cadmium-9695.94034(43) u
[95.9140096 u]
{-55.57293 MeV}
0+
97Cd489749Cadmium-9796.93510(32) u
[96.9087696 u]
{-60.45396 MeV}
(9/2+)
98Cd489850Cadmium-9897.92739(6) u
[97.9010596 u]
{-67.63578 MeV}
0+
99Cd489951Cadmium-9998.9249258(17) u
[98.8985954 u]
{-69.93117 MeV}
(5/2+)
100Cd4810052Cadmium-10099.9203488(18) u
[99.8940184 u]
{-74.19461 MeV}
0+100In
101Sn
101Cd4810153Cadmium-101100.9185862(16) u
[100.8922558 u]
{-75.83647 MeV}
(5/2+)-0.8970(4)101In
102Cd4810254Cadmium-102101.9144818(18) u
[101.8881514 u]
{-79.65969 MeV}
0+102In
103Cd4810355Cadmium-103102.9134169(19) u
[102.8870865 u]
{-80.65164 MeV}
(5/2)+-0.8486(4)103In
104Cd4810456Cadmium-104103.9098562(18) u
[103.8835258 u]
{-83.96841 MeV}
0+104In
105Cd4810557Cadmium-105104.9094639(15) u
[104.8831335 u]
{-84.33383 MeV}
5/2+- 0.7382(4)105In
106Cd4810658Cadmium-106105.906460(8) u
[105.8801296 u]
{-87.13195 MeV}
0+106In
106Ag
107Cd4810759Cadmium-107106.9066121(18) u
[106.8802817 u]
{-86.99027 MeV}
5/2+-0.6141(3)107In
108Cd4810860Cadmium-108107.904183(8) u
[107.8778526 u]
{-89.25296 MeV}
0+108In
108Ag
109Cd4810961Cadmium-109108.9049867(16) u
[108.8786563 u]
{-88.50432 MeV}
5/2+-0.8266(4)109In
109m1Cd4810961Cadmium-109m1108.9049867(16) u
[108.8786563 u]
{-88.50432 MeV}
1/2+
109m2Cd4810961Cadmium-109m2108.9049867(16) u
[108.8786563 u]
{-88.50432 MeV}
11/2--1.096(2)
110Cd4811062Cadmium-110109.903007(4) u
[109.8766766 u]
{-90.3484 MeV}
0+110In
110Ag
111Cd4811163Cadmium-111110.904183(4) u
[110.8778526 u]
{-89.25296 MeV}
1/2+-0.5940(3)111In
111Ag
111mCd4811163Cadmium-111m110.904183(4) u
[110.8778526 u]
{-89.25296 MeV}
11/2--1.1051(4)
112Cd4811264Cadmium-112111.902763(4) u
[111.8764326 u]
{-90.57568 MeV}
0+112In
112Ag
113Cd4811365Cadmium-113112.904408(3) u
[112.8780776 u]
{-89.04337 MeV}
1/2+-0.6213(3)113Ag
113mCd4811365Cadmium-113m112.904408(3) u
[112.8780776 u]
{-89.04337 MeV}
11/2--1.0883(3)
114Cd4811466Cadmium-114113.903365(3) u
[113.8770346 u]
{-90.01492 MeV}
0+114Ag
114In
115Cd4811567Cadmium-115114.9054374(7) u
[114.879107 u]
{-88.08449 MeV}
1/2+-0.6483(2)115Ag
115mCd4811567Cadmium-115m114.9054374(7) u
[114.879107 u]
{-88.08449 MeV}
(11/2)--1.0394(6)
115m+Cd4811567Cadmium-115m+
116Cd4811668Cadmium-116115.904763(2) u
[115.8784326 u]
{-88.71269 MeV}
0+116In
116Ag
117Cd4811769Cadmium-117116.9072260(11) u
[116.8808956 u]
{-86.41842 MeV}
1/2+-0.7425(4)117Ag
117mCd4811769Cadmium-117m116.9072260(11) u
[116.8808956 u]
{-86.41842 MeV}
(11/2)--0.9961(5)
118Cd4811870Cadmium-118117.906922(21) u
[117.8805916 u]
{-86.7016 MeV}
0+118Ag
119Cd4811971Cadmium-119118.90985(4) u
[118.8835196 u]
{-83.97418 MeV}
1/2+-0.9188(4)119Ag
119mCd4811971Cadmium-119m118.90985(4) u
[118.8835196 u]
{-83.97418 MeV}
(11/2-)-0.9628(5)
120Cd4812072Cadmium-120119.909868(4) u
[119.8835376 u]
{-83.95742 MeV}
0+120Ag
121Cd4812173Cadmium-121120.9129637(21) u
[120.8866333 u]
{-81.07379 MeV}
(3/2+)+0.6260(7)121Ag
121mCd4812173Cadmium-121m120.9129637(21) u
[120.8866333 u]
{-81.07379 MeV}
(11/2-)-1.0085(6)
122Cd4812274Cadmium-122121.9134591(25) u
[121.8871287 u]
{-80.61233 MeV}
0+122Ag
123Ag
123Cd4812375Cadmium-123122.9168925(29) u
[122.8905621 u]
{-77.41414 MeV}
(3/2+)+0.7885(7)123Ag
252Cf
123mCd4812375Cadmium-123m122.9168925(29) u
[122.8905621 u]
{-77.41414 MeV}
(11/2-)-1.0000(6)
124Cd4812476Cadmium-124123.917657(3) u
[123.8913266 u]
{-76.70201 MeV}
0+124Ag
125Ag
125Cd4812577Cadmium-125124.921258(3) u
[124.8949276 u]
{-73.3477 MeV}
(3/2+)+0.8591(7)
125mCd4812577Cadmium-125m124.921258(3) u
[124.8949276 u]
{-73.3477 MeV}
(11/2-)-0.9333(4)
126Cd4812678Cadmium-126125.9224291(27) u
[125.8960987 u]
{-72.25683 MeV}
0+126Ag
127Cd4812779Cadmium-127126.926197(13) u
[126.8998666 u]
{-68.74705 MeV}
(3/2+)+0.8771(8)
128Cd4812880Cadmium-128127.927813(8) u
[127.9014826 u]
{-67.24176 MeV}
0+128Ag
129Cd4812981Cadmium-129128.932304(18) u
[128.9059736 u]
{-63.05842 MeV}
11/2--0.7052(6)
130Cd4813082Cadmium-130129.934388(24) u
[129.9080576 u]
{-61.11718 MeV}
0+130Ag
131Cd4813183Cadmium-131130.94072(11) u
[130.9143896 u]
{-55.21896 MeV}
(7/2-)
132Cd4813284Cadmium-132131.94604(21) u
[131.9197096 u]
{-50.26342 MeV}
0+
133Cd4813385Cadmium-133132.95285(32) u
[132.9265196 u]
{-43.91994 MeV}
(7/2-)
134Cd4813486Cadmium-134133.95822(43) u
[133.9318896 u]
{-38.91782 MeV}
0+

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Cd-94760 nsEC, p → 94Ag
EC, β+94Ag
?
?

Cd-95- ungelistet -AL
Cd-961.03 sEC/β+96Ag100 %8.94(41) MeVAL
Cd-972.8(6) sEC → 97Ag
EC, p → 96Pd
< 100 %
?
10.37(32) MeV
AL
Cd-989.2(3) sEC/β+98Ag
ε, p → 97Pd
> 99.975 %
< 0.025 %
5.43(6) MeV
AL
Cd-9916(3) sEC/β+99Ag
β+, p → 98Pd
β+, α → 94Rh
99.83 %
0.17 %
0.0004 %
6.781(6) MeV

AL
Cd-10049.1(5) sEC/β+100Ag100 %3.943(5) MeVAL
Cd-1011.36(5) minEC/β+101Ag100 %5.498(5) MeVAL
Cd-1025.5(5) minEC/β+102Ag100 %2.587(8) MeVAL
Cd-1037.3(1) minEC/β+103Ag100 %4.1481 MeVAL
Cd-10457.7(10) minEC/β+104Ag100 %1.148(5) MeVAL
Cd-10555.5(4) minEC/β+105Ag100 %2.737(5) MeVAL
Cd-106stable2 β+ ? 106PdAL
Cd-1076.50(2) hEC/β+107Ag100 %1.4164(29) MeVAL
Cd-108stable2 β+ ? 108PdAL
Cd-109461.9(4) dEC → 109Ag100 %0.2151(20) MeVAL
Cd-109m111.8(16) μsIso → 109Cd100 %59.60(7) keV
Cd-109m210.6(4) μsIso → 109Cd100 %463.10(11) keV
Cd-110stableAL
Cd-111stableAL
Cd-111m48.50(9) minIso → 111Cd100 %396.214(21) keV
Cd-112stableAL
Cd-1138.04(5) × 1015 aβ-113In100 %0.32383(26) MeVAL
Cd-113m14.1(5) aβ-113In
Iso → 113Cd
99.86 %
0.14 %

263.54(3) keV
Cd-114stable2 β+ ? 114SnAL
Cd-11553.46(5) hβ-115In100 %1.4519(7) MeVAL
Cd-115m44.56(24) dβ-115In100 %181.0(5) keV
Cd-115m+
Cd-1163.3(4) × 1019 a2 β-116Sn?AL
Cd-1172.49(4) hβ-117In100 %2.525(5) MeVAL
Cd-117m3.36(5) hβ-117In100 %136.4(2) keV
Cd-11850.3(2) minβ-118In100 %0.527(21) MeVAL
Cd-1192.69(2) minβ-119In100 %3.72(4) MeVAL
Cd-119m2.20(2) minβ-119In100 %146.54(11) keV
Cd-12050.80(21) sβ-120In100 %1.77(4) MeVAL
Cd-12113.5(3) sβ-121In100 %4.762(27) MeVAL
Cd-121m8.3(8) sβ-121In100 %214.86(15) keV
Cd-1225.24(3) sβ-122In100 %2.96(5) MeVAL
Cd-1232.10(2) sβ-123In100 %6.106(20) MeVAL
Cd-123m1.82(3) sβ-123In
Iso → 123Cd
≤ 100 %
?

316.53(23) keV
Cd-1241.25(2) sβ-124In100 %4.17(3) MeVAL
Cd-1250.68(4) sβ-125In100 %7.129(27) MeVAL
Cd-125m0.48(3) sβ-125In100 %+x keV
Cd-126515(17) msβ-126In100 %5.516(27) MeVAL
Cd-1270.37(7) sβ-127In100 %8.149(24) MeVAL
Cd-1280.28(4) sβ-128In100 %6.90(15) MeVAL
Cd-129154(2) msβ-129In
β-, n → 128In
< 100 %
> 0 %
9.78(17) MeV
3.02(15) MeV
AL
Cd-130162(7) msβ-130In
β-, n → 129In
96.5(10) %
3.5(10) %
8.77(4) MeV
3.649(23) MeV
AL
Cd-13168(3) msβ-131In
β-, n → 130In
96.5(10) %
3.5(10) %
12.81(10) MeV
6.59(11) MeV
AL
Cd-13284(5) msβ-132In
β-, n → 131In
β-, 2n → 130In
< 40 %
60(15) %
?
12.15(20) MeV
9.69(20) MeV
AL
Cd-13357(10) msβ-133In
β-, n → 132In
β-, 2n → 131In
?
?
?
13.54(36) MeV
10.42(30) MeV
AL
Cd-13465 msβ-134In
β-, n → 133In
β-, 2n → 132In
100 %
?
?
12.74(50) MeV
10.47(44) 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 Cadmium isotope.
6 - Relative atomic mass of the Cadmium 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 Cadmium 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 Cadmium 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)
111Cd
12,795(12) %
1/2+
-0,5940(3)5,70469,06920,00966
0,2130
113Cd
12,227(7) %
1/2+
-0,6213(3)5,96099,48710,01106
0,2228

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 Cadmium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Cd-104+107 Bq100 Bq/g57.7 min
Cd-107+107 Bq1000 Bq/g6.5 h
Cd-109+106 Bq1 Bq/g20 TBq100 Bq cm-2Ag-109m462.6 d
Cd-113106 Bq0,1 Bq/g7.7 × 1015 a
Cd-113m106 Bq0,1 Bq/g40 TBq14.6 a
Cd-115+106 Bq10 Bq/g0,2 TBq10 Bq cm-253.5 h
Cd-115m+106 Bq100 Bq/g3 TBq100 Bq cm-244.6 d
Cd-117+106 Bq10 Bq/g2.5 h
Cd-117m106 Bq10 Bq/g3.4 h

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

 

Literature Sources and References

Properties of the Cadmium 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.

Cadmium: NMR properties - 111Cd-NMR, 113Cd-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] - S. Ripperger, M. Rehkämper:
Precise determination of cadmium isotope fractionation in seawater by double spike MC-ICPMS.
In: Geochimica et Cosmochimica Acta, (2007), DOI 10.1016/j.gca.2006.10.005.

[10] - S. Ripperger, M. Rehkämper, D. Porcelli, A. N. Halliday:
Cadmium isotope fractionation in seawater - A signature of biological activity.
In: Earth and Planetary Science Letters, (2007), DOI 10.1016/j.epsl.2007.07.034.

[11] - Zichen Xue, Mark Rehkämper, Maria Schönbächler, Peter J. Statham, Barry J. Coles:
A new methodology for precise cadmium isotope analyses of seawater.
In: Analytical and Bioanalytical Chemistry, (2012), DOI 10.1007/s00216-011-5487-0.

[12] - Wafa Abouchami et al.:
A Common Reference Material for Cadmium Isotope Studies - NIST SRM 3108.
In: Geostandards and Geoanalytical Research, (2012), DOI 10.1111/j.1751-908X.2012.00175.x.

[13] - NN:
Masse des Cadmiumisotops Cd-132 bestimmt.
In: Internetchemie News, (2020), DOI https://www.internetchemie.info/news/2020/mar20/masse%20des%20cadmiumisotops%20cd-132%20bestimmt.php.

 


Category: Isotopes

Last update: 05.07.2020



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