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Isotopes of Niobium

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

 

Niobium isotopes

All atomic nuclei of the chemical element niobium are summarized under niobium isotopes; these all consist of an atomic nucleus with 41 protons and, in the uncharged state, 41 electrons. The difference between each niobium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Niobium Isotopes

Only one isotope of niobium occurs in nature: 93Nb, standard atomic mass 92.90637(2) u.

 

All other known and characterized niobium nuclides are unstable and are of no importance for technical applications.

 

Isotope Table: Niobium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
81Nb418140Niobium-8180.95023(43) u
[80.9277392 u]
{-46.36046 MeV}
82Nb418241Niobium-8281.94408(32) u
[81.9215892 u]
{-52.08914 MeV}
(0+)
83Nb418342Niobium-8382.93821(16) u
[82.9157192 u]
{-57.55701 MeV}
(5/2+)
84Nb418443Niobium-8483.934279(14) u
[83.9117792 u]
{-61.2271 MeV}
(1+,2+,3+)
84mNb418443Niobium-84m83.934279(14) u
[83.9117792 u]
{-61.2271 MeV}
(5-)
85Nb418544Niobium-8584.928846(4) u
[84.9063552 u]
{-66.27952 MeV}
(9/2+)
86Nb418645Niobium-8685.925782(6) u
[85.9032912 u]
{-69.13362 MeV}
(6+)86Mo
87Nb418746Niobium-8786.920692(7) u
[86.8982012 u]
{-73.87493 MeV}
(1/2)-87Mo
87mNb418746Niobium-87m86.920692(7) u
[86.8982012 u]
{-73.87493 MeV}
(9/2+)
88Nb418847Niobium-8887.91822(6) u
[87.8957292 u]
{-76.17758 MeV}
(8+)88Mo
88mNb418847Niobium-88m87.91822(6) u
[87.8957292 u]
{-76.17758 MeV}
(4-)
89Nb418948Niobium-8988.913445(25) u
[88.8909542 u]
{-80.62546 MeV}
(9/2+)6.216(5)89Mo
89mNb418948Niobium-89m88.913445(25) u
[88.8909542 u]
{-80.62546 MeV}
(1/2)-
90Nb419049Niobium-9089.911259(4) u
[89.8887682 u]
{-82.66171 MeV}
8+4.946(4)90Mo
90m1Nb419049Niobium-90m189.911259(4) u
[89.8887682 u]
{-82.66171 MeV}
6++3.720(24)
90m2Nb419049Niobium-90m289.911259(4) u
[89.8887682 u]
{-82.66171 MeV}
4--0.018(9)
90m3Nb419049Niobium-90m389.911259(4) u
[89.8887682 u]
{-82.66171 MeV}
7+
90m4Nb419049Niobium-90m489.911259(4) u
[89.8887682 u]
{-82.66171 MeV}
1+
90m5Nb419049Niobium-90m589.911259(4) u
[89.8887682 u]
{-82.66171 MeV}
(11-)+8.778(33)
91Nb419150Niobium-9190.906990(3) u
[90.8844992 u]
{-86.63826 MeV}
9/2++6.513(3)91Mo
91m1Nb419150Niobium-91m190.906990(3) u
[90.8844992 u]
{-86.63826 MeV}
1/2--0.101(2)
91m2Nb419150Niobium-91m290.906990(3) u
[90.8844992 u]
{-86.63826 MeV}
(17/2-)+10.82(14)
92Nb419251Niobium-9291.9071886(19) u
[91.8846978 u]
{-86.45326 MeV}
(7)++5.130(4)
92m1Nb419251Niobium-92m191.9071886(19) u
[91.8846978 u]
{-86.45326 MeV}
(2)+6.137(4)
92m2Nb419251Niobium-92m291.9071886(19) u
[91.8846978 u]
{-86.45326 MeV}
(2)--1.398(14)
92m3Nb419251Niobium-92m391.9071886(19) u
[91.8846978 u]
{-86.45326 MeV}
(11-)+9.7(3)
93Nb419352Niobium-9392.90637(2) u
[92.8838792 u]
{-87.21578 MeV}
9/2++6.163(2)93Mo
93Zr
93mNb419352Niobium-93m92.90637(2) u
[92.8838792 u]
{-87.21578 MeV}
1/2-
94Nb419453Niobium-9493.9072790(16) u
[93.8847882 u]
{-86.36906 MeV}
6+
94mNb419453Niobium-94m93.9072790(16) u
[93.8847882 u]
{-86.36906 MeV}
3+
95Nb419554Niobium-9594.9068311(5) u
[94.8843403 u]
{-86.78627 MeV}
9/2+6.141(5)95Zr
95mNb419554Niobium-95m94.9068311(5) u
[94.8843403 u]
{-86.78627 MeV}
1/2-
96Nb419655Niobium-9695.90810159(16) u
[95.8856108 u]
{-85.60282 MeV}
6+4.975(4)
97Nb419756Niobium-9796.908098(5) u
[96.8856072 u]
{-85.60616 MeV}
9/2+6.153(5)97Zr
97mNb419756Niobium-97m96.908098(5) u
[96.8856072 u]
{-85.60616 MeV}
1/2-
98Nb419857Niobium-9897.910333(5) u
[97.8878422 u]
{-83.52427 MeV}
1+98Zr
98mNb419857Niobium-98m97.910333(5) u
[97.8878422 u]
{-83.52427 MeV}
(5+)
99Nb419958Niobium-9998.911609(13) u
[98.8891182 u]
{-82.33569 MeV}
9/2++ 5.96(3)99Zr
99mNb419958Niobium-99m98.911609(13) u
[98.8891182 u]
{-82.33569 MeV}
1/2-
100Nb4110059Niobium-10099.914334(9) u
[99.8918432 u]
{-79.79737 MeV}
1+100Zr
100m1Nb4110059Niobium-100m199.914334(9) u
[99.8918432 u]
{-79.79737 MeV}
(5+)
101Nb4110160Niobium-101100.915306(4) u
[100.8928152 u]
{-78.89195 MeV}
(5/2+)+3.186(2)101Zr
248Cm
252Cf
102Nb4110261Niobium-102101.9180837(27) u
[101.8955929 u]
{-76.30454 MeV}
(4+)102Zr
252Cf
102m1Nb4110261Niobium-102m1101.9180837(27) u
[101.8955929 u]
{-76.30454 MeV}
1+
103Nb4110362Niobium-103102.919453(4) u
[102.8969622 u]
{-75.02905 MeV}
(5/2+)+3.133(4)103Zr
248Cm
252Cf
104Nb4110463Niobium-104103.9228991(29) u
[103.9004083 u]
{-71.81903 MeV}
(1+)104Zr
252Cf
104mNb4110463Niobium-104m103.9228991(29) u
[103.9004083 u]
{-71.81903 MeV}
105Nb4110564Niobium-105104.924943(4) u
[104.9024522 u]
{-69.91515 MeV}
(5/2+)
106Nb4110665Niobium-106105.928928(4) u
[105.9064372 u]
{-66.20314 MeV}
(1-)
106mNb4110665Niobium-106m105.928928(4) u
[105.9064372 u]
{-66.20314 MeV}
(3+)
107Nb4110766Niobium-107106.931590(9) u
[106.9090992 u]
{-63.7235 MeV}
108Nb4110867Niobium-108107.936075(9) u
[107.9135842 u]
{-59.54575 MeV}
(2+)
108mNb4110867Niobium-108m107.936075(9) u
[107.9135842 u]
{-59.54575 MeV}
(4-,5)
109Nb4110968Niobium-109108.93914(28) u
[108.9166492 u]
{-56.69072 MeV}
(5/2+)
110Nb4111069Niobium-110109.94384(90) u
[109.9213492 u]
{-52.3127 MeV}
(5)
111Nb4111170Niobium-111110.94753(32) u
[110.9250392 u]
{-48.87549 MeV}
(5/2+)
112Nb4111271Niobium-112111.95247(32) u
[111.9299792 u]
{-44.27391 MeV}
(2+)
113Nb4111372Niobium-113112.95651(43) u
[112.9340192 u]
{-40.51067 MeV}
114Nb4111473Niobium-114113.96201(54) u
[113.9395192 u]
{-35.38746 MeV}
115Nb4111574Niobium-115114.96634(54) u
[114.9438492 u]
{-31.35409 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Nb-81200 nsEC/β+81Zr?11.10(41) MeVAL
Nb-8250(6) msEC/β+82Zr
EC, p → 81Y
100 %
?
11.54(30) MeV
AL
Nb-833.9(2) sEC/β+83Zr100 %8.36(15) MeVAL
Nb-849.8(9) sEC/β+84Zr
EC, p → 83Y
> 99.9 %
?
10.203(14) MeV
AL
Nb-84m103(19) nsIso → 84Nb100 %337.7(4) keV
Nb-8520.9(7) sEC/β+85Zr100 %6.896(8) MeVAL
Nb-8688(1) sEC/β+86Zr100 %8.835(7) MeVAL
Nb-873.7(1) minEC/β+87Zr100 %5.473(8) MeVAL
Nb-87m2.6(1) minEC/β+87Zr100 %3.9(1) keV
Nb-8814.50(11) minEC/β+88Zr100 %7.46(6) MeVAL
Nb-88m7.7(1) minEC/β+88Zr100 %+x
Nb-892.03(7) hEC/β+89Zr100 %4.250(24) MeVAL
Nb-89m66(2) minEC/β+89Zr100 %
Nb-9014.60(5) hEC/β+90Zr100 %6.111(3) MeVAL
Nb-90m163(2) μsIso → 90Nb100 %122.370(22) keV
Nb-90m218.81(6) sIso → 90Nb100 %124.67(25) keV
Nb-90m31 μs171.10(10) keVAL
Nb-90m46.19(8) msIso → 90Nb100 %382.01(25) keV
Nb-90m5472(13) ns1880.21(20) keV
Nb-91680(130) aEC/β+91Zr100 %1.2576(29) MeVAL
Nb-91m160.86(22) dEC/β+91Zr
Iso → 91Nb
3.4(5) %
96.6(5) %

104.60(5) keV
Nb-91m23.76(12) μsIso → 91Nb100 %2034.42(20) keV
Nb-923.47(24) × 107 aβ+92Zr
β-92Mo
> 99.95 %
< 0.05 %
2.0057(18) MeV
0.3553(18) MeV
AL
Nb-92m110.15(2) dEC/β+92Zr100 %135.5(4) keV
Nb-92m25.9(2) μs225.8(4) keV
Nb-92m3167(4) ns2203.3(4) keV
Nb-93stableAL
Nb-93m16.12(12) aIso → 93Nb100 %30.77(2) keV
Nb-942.03(16) × 104 aβ-94Mo100 %2.0450(15) MeVAL
Nb-94m6.263(4) minβ-94Mo
Iso → 94Nb
0.50(6) %
99.50(6) %

40.892(12) keV
Nb-9534.991(6) dβ-95Mo100 %0.9256(5) MeVAL
Nb-95m3.61(3) dβ-95Mo
Iso → 95Nb
5.6(6) %
94.4(6) %

235.69(2) keV
Nb-9623.35(5) hβ-96Mo100 %3.19206(11) MeVAL
Nb-9772.1(7) minβ-97Mo100 %1.939(4) MeVAL
Nb-97m58.7(18) sIso → 97Nb100 %743.35(3) keV
Nb-982.86(6) sβ-98Mo100 %4.591(5) MeVAL
Nb-98m51.3(4) minβ-98Mo
Iso → 98Nb
> 99.9(1) %
< 0.2 %

84(4) keV
Nb-9915.0(2) sβ-99Mo100 %3.635(12) MeVAL
Nb-99m2.5(2) minβ-99Mo
Iso → 99Nb
> 96.2 %
< 3.8 %

365.27(8) keV
Nb-1001.5(2) sβ-100Mo100 %6.396(8) MeVAL
Nb-100m12.99(11) sβ-100Mo100 %314(23) keVAL
Nb-1017.1(3) sβ-101Mo100 %4.628(4) MeVAL
Nb-1024.3(4) sβ-102Mo100 %7.2562(9) MeVAL
Nb-102m11.3(2) sβ-102Mo100 %+x
Nb-1031.5(2) sβ-103Mo100 %5.932(10) MeVAL
Nb-1044.9(3) sβ-104Mo
β-, n → 103Mo
99.94 %
0.06(3) %
8.531(9) MeV
1.07(1) MeV
AL
Nb-104m0.94(4) sβ-104Mo
β-, n → 103Mo
99.95 %
0.05 %

215(12) keV
Nb-1052.95(6) sβ-105Mo
β-, n → 104Mo
98.3(9) %
1.7(9) %
7.422(10) MeV
2.363(10) MeV
AL
Nb-1061.02(5) sβ-106Mo
β-, n → 105Mo
95.5(3) %
4.5(3) %
9.931(10) MeV
3.062(10) MeV
AL
Nb-106m0.82(6) μsIso → 106Nb100 %204.8(1) keV
Nb-107300(9) msβ-107Mo100 %8.828(12) MeVAL
Nb-108198(6) msβ-108Mo
β-, n → 107Mo
β-, 2n → 106Mo
93.7(5) %
6.3(5) %
?
11.21(12) MeV
4.934(12) MeV
AL
Nb-108m0.109(2) μsIso → 108Nb100 %166.6(5) keV
Nb-109108(5) msβ-109Mo
β-, n → 108Mo
85 %
15 %
9.98(26) MeV
5.99(26) MeV
AL
Nb-11082(4) msβ-110Mo
β-, n → 109Mo
60(8) %
40(8) %
12.23(84) MeV
6.28(84) MeV
AL
Nb-11154(2) msβ-111Mo
β-, n → 110Mo
β-, 2n → 109Mo

?
?
11.06(30) MeV
7.6(3) MeV
AL
Nb-11233 msβ-112Mo100 %13.19(36) %AL
Nb-11332(4) msβ-113Mo
β-, n → 112Mo
β-, 2n → 111Mo

?
?
11.98(50) MeV
8.88(45) MeV
AL
Nb-11417(5) msβ-114Mo
β-, n → 113Mo
β-, 2n → 112Mo

?
?
14.442(58) MeV
9.03(59) MeV
AL
Nb-11523(8) msβ-115Mo
β-, n → 114Mo
β-, 2n → 113Mo

?
?
13.39(64) MeV
10.38(58) 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 Niobium isotope.
6 - Relative atomic mass of the Niobium 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 Niobium 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 Niobium 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)
93Nb
100 %
9/2+
+6,163(2)6,5674-32,0(20)10,45230,48821
8,1013

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 Niobium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Nb-88105 Bq10 Bq/g14.5 min
Nb-89+105 Bq10 Bq/g2.0 h
Nb-90+105 Bq10 Bq/g14.6 h
Nb-93m107 Bq10 Bq/g300 TBq100 Bq cm-216.1 a
Nb-94106 Bq0,1 Bq/g0,04 TBq1 Bq cm-220000 a
Nb-95106 Bq1 Bq/g0,09 TBq1 Bq cm-235.0 d
Nb-97106 Bq10 Bq/g0,1 TBq1 Bq cm-272.1 min
Nb-98m105 Bq10 Bq/g1 Bq cm-251.3 min

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

 

Literature Sources and References

Properties of the Niobium 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.

Niobium: NMR properties - 93Nb-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. Nystrom, M. Thoennessen:
Discovery of Yttrium, Zirconium, Niobium, Technetium, and Ruthenium Isotopes.
In: Atomic Data and Nuclear Data Tables, (2012), DOI 10.1016/j.adt.2011.12.002.

 


Category: Isotopes

Last update: 05.07.2020



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