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Isotopes of Technetium

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

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

All atomic nuclei of the chemical element technetium are summarized under technetium isotopes; these all consist of an atomic nucleus with 43 protons and, in the uncharged state, 43 electrons. The difference between each technetium isotope is based on the number of neutrons in the nucleus.

Among the first 83 chemical elements, technetium and promethium are the only elements that do not have stable isotopes. Technetium is virtually non-existent in nature - at most in the smallest traces as a decay product of uranium or through electron capture from molybdenum isotopes. A total of 36 radionuclides and several metastable nuclear isomers of technetium are currently known.

Some technetium isotopes - mainly Tc-99m - are used as beta emitters and in the form of radiopharmaceuticals, especially in nuclear medicine for diagnostic purposes. The short-lived radionuclides are generated in so-called technetium generators.

 

Isotope Table: Technetium

The two following tables list the most important data and properties of the Technetium isotopes. Further information on the individual Technetium 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
Technetium-858543Tc4284.95078(43) u
[84.9271922 u]
{-45.84813 MeV}
Technetium-868643Tc4385.94464(32) u
[85.9210522 u]
{-51.56751 MeV}		(0+)
Technetium-86m86m43Tc4385.94464(32) u
[85.9210522 u]
{-51.56751 MeV}		(6+)
Technetium-878743Tc4486.938067(4) u
[86.9144792 u]
{-57.69022 MeV}		(9/2+)
Technetium-87m87m43Tc4486.938067(4) u
[86.9144792 u]
{-57.69022 MeV}		(7/2+)
Technetium-888843Tc4587.93378(16) u
[87.9101922 u]
{-61.68353 MeV}		X: (5+,6+,7+)
Y: (2+, 3+)
Technetium-88m88m43Tc4587.93268(22) u
[87.9090922 u]
{-62.70818 MeV}
Technetium-898943Tc4688.927649(4) u
[88.9040612 u]
{-67.39452 MeV}		(9/2+)
Technetium-89m89m43Tc4688.927649(4) u
[88.9040612 u]
{-67.39452 MeV}		(1/2-)
Technetium-909043Tc4789.9240739(11) u
[89.9004861 u]
{-70.72471 MeV}		(8+)
Technetium-90m90m43Tc4789.9240739(11) u
[89.9004861 u]
{-70.72471 MeV}		1+90Ru
Technetium-919143Tc4890.9184250(25) u
[90.8948372 u]
{-75.98662 MeV}		(9/2)+91Ru
Technetium-91m91m43Tc4890.9184250(25) u
[90.8948372 u]
{-75.98662 MeV}		(1/2)-
Technetium-929243Tc4991.915270(3) u
[91.8916822 u]
{-78.92549 MeV}		(8)+92Ru
Technetium-92m92m43Tc4991.915270(3) u
[91.8916822 u]
{-78.92549 MeV}		(4+)
Technetium-939343Tc5092.9102451(11) u
[92.8866573 u]
{-83.60615 MeV}		9/2+93Ru
Technetium-93m193m143Tc5092.9102451(11) u
[92.8866573 u]
{-83.60615 MeV}		1/2-
Technetium-93m293m243Tc5092.9102451(11) u
[92.8866573 u]
{-83.60615 MeV}		(17/2)-
Technetium-949443Tc5193.909652(4) u
[93.8860642 u]
{-84.15862 MeV}		7+94Ru
Technetium-94m94m43Tc5193.909652(4) u
[93.8860642 u]
{-84.15862 MeV}		(2)+
Technetium-959543Tc5294.907652(5) u
[94.8840642 u]
{-86.02161 MeV}		9/2+95Ru
Technetium-95m95m43Tc5294.907652(5) u
[94.8840642 u]
{-86.02161 MeV}		1/2-
Technetium-969643Tc5395.907867(6) u
[95.8842792 u]
{-85.82134 MeV}		7+96Ru
Technetium-96m96m43Tc5395.907867(6) u
[95.8842792 u]
{-85.82134 MeV}		4+
Technetium-979743Tc5496.906361(4) u
[96.8827732 u]
{-87.22417 MeV}		9/2+97Ru
Technetium-97m97m43Tc5496.906361(4) u
[96.8827732 u]
{-87.22417 MeV}		1/2-
Technetium-989843Tc5597.90721(3) u
[97.8836222 u]
{-86.43333 MeV}		(6)+
Technetium-98m98m43Tc5597.90721(3) u
[97.8836222 u]
{-86.43333 MeV}		(2)-
Technetium-999943Tc5698.9062497(10) u
[98.8826619 u]
{-87.32784 MeV}		9/2+99Mo
Technetium-99m99m43Tc5698.9062547(21) u
[98.8826669 u]
{-87.32318 MeV}		1/2-
Technetium-10010043Tc5799.9076527(14) u
[99.8840649 u]
{-86.02096 MeV}		1+
Technetium-100m1100m143Tc5799.9076527(14) u
[99.8840649 u]
{-86.02096 MeV}		(4)+
Technetium-100m2100m243Tc5799.9076527(14) u
[99.8840649 u]
{-86.02096 MeV}		(6)+
Technetium-10110143Tc58100.907305(26) u
[100.8837172 u]
{-86.34484 MeV}		9/2+101Mo
Technetium-101m101m43Tc58100.907305(26) u
[100.8837172 u]
{-86.34484 MeV}		1/2-
Technetium-10210243Tc59101.909207(10) u
[101.8856192 u]
{-84.57313 MeV}		1+102Mo
Technetium-102m102m43Tc59101.909207(10) u
[101.8856122 u]
{-84.57966 MeV}		(4,5)
Technetium-10310343Tc60102.909174(11) u
[102.8855862 u]
{-84.60387 MeV}		5/2+103Mo
Technetium-10410443Tc61103.911429(27) u
[103.8878412 u]
{-82.50336 MeV}		(3+)104Mo
Technetium-104m1104m143Tc61103.911429(27) u
[103.8878412 u]
{-82.50336 MeV}		(+)
Technetium-104m2104m243Tc61103.911429(27) u
[103.8878412 u]
{-82.50336 MeV}		(+)
Technetium-10510543Tc62104.91166(4) u
[104.8880722 u]
{-82.28818 MeV}		(3/2-)105Mo
Technetium-10610643Tc63105.914357(13) u
[105.8907692 u]
{-79.77594 MeV}		(1,2)106Mo
Technetium-10710743Tc64106.915458(9) u
[106.8918702 u]
{-78.75037 MeV}		(3/2-)107Mo
Technetium-107m1107m143Tc64106.915458(9) u
[106.8918702 u]
{-78.75037 MeV}		(1/2+)
Technetium-107m2107m243Tc64106.915458(9) u
[106.8918702 u]
{-78.75037 MeV}		(5/2+)
Technetium-10810843Tc65107.918494(9) u
[107.8949062 u]
{-75.92235 MeV}		(2)+108Mo
Technetium-10910943Tc66108.920254(10) u
[108.8966662 u]
{-74.28292 MeV}		(5/2+)
Technetium-11011043Tc67109.923741(10) u
[109.9001532 u]
{-71.0348 MeV}		(2,3+)110Mo
Technetium-11111143Tc68110.925899(11) u
[110.9023112 u]
{-69.02464 MeV}		(5/2+)
Technetium-11211243Tc69111.929942(6) u
[111.9063542 u]
{-65.25861 MeV}		(2+)
Technetium-112m112m43Tc69111.929942(6) u
[111.9063542 u]
{-65.25861 MeV}		(5+)
Technetium-11311343Tc70112.932569(4) u
[112.9089812 u]
{-62.81157 MeV}		(5/2+)
Technetium-113m113m43Tc70112.932569(4) u
[112.9089812 u]
{-62.81157 MeV}		(5/2-)
Technetium-11411443Tc71113.93709(46) u
[113.9135022 u]
{-58.60029 MeV}		≥4
(1+)
Technetium-11511543Tc72114.93954(85) u
[114.9159522 u]
{-56.31813 MeV}
Technetium-11611643Tc73115.94476(32) u
[115.9211722 u]
{-51.45573 MeV}
Technetium-11711743Tc74116.94806(43) u
[116.9244722 u]
{-48.3818 MeV}		(5/2+)
Technetium-11811843Tc75117.95299(43) u
[117.9294022 u]
{-43.78953 MeV}
Technetium-11911943Tc76118.95666(54) u
[118.9330722 u]
{-40.37095 MeV}
Technetium-12012043Tc77119.96187(54) u
[119.9382822 u]
{-35.51787 MeV}
Technetium-12112143Tc78120.96588(54) u
[120.9422922 u]
{-31.78258 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Tc-85100 nsp → 84Mo?AL
Tc-8655(7) msEC/β+ → 86Mo
EC, p → 85Nb
?		12.54(30) MeV
AL
Tc-86m1.10(14) μsIso → 86Tc100 %
Tc-872.2(2) sEC/β+ → 87Mo100 %9.195(5) MeVAL
Tc-87m647(24) nsIso → 87Tc100 %
Tc-88X: 6.4(8) s
Y: 5.8(2) s		EC/β+ → 88Mo
EC, p → 87Nb		100 %
?		11.01(15) MeV
AL
Tc-88m146(12) nsIso → 88Tc100 %
Tc-8912.8(9) sEC/β+ → 89Mo100 %7.62(5) MeVAL
Tc-89m12.9(8) sEC, β+ → 89Mo
Iso → 89Tc		100 %
< 0.01 %
Tc-9049.2(4) sEC/β+ → 90Mo100 %9.448(4) MeVAL
Tc-90m8.7(2) sEC/β+ → 90Mo100 %
Tc-913.14(2) minEC/β+ → 91Mo100 %6.222(7) MeVAL
Tc-91m3.3(1) minEC/β+ → 91Mo
Iso → 91Tc		< 100 %
< 1 %		6.570 MeV
Tc-924.25(15) minEC/β+ → 91Mo100 %7.883(3) MeVAL
Tc-92m1.03(7) μs
Tc-932.75(5) hEC/β+ → 92Mo100 %3.201(1) MeVAL
Tc-93m143.5(10) minEC/β+ → 93Mo
Iso → 93Tc		22.6(6) %
77.4(6) %		3.593 MeV
0.392 MeV
Tc-93m210.2(3) μsIso → 93Tc100 %2.185 MeV
Tc-94293(1) minEC/β+ → 94Mo100 %4.256(4) MeVAL
Tc-94m52.0(10) minEC/β+ → 94Mo
Iso → 94Tc		100 %
< 0.1 %		4.331 MeV
0.075 MeV
Tc-9520.0(1) hEC/β+ → 95Mo100 %1.691(5) MeVAL
Tc-95m61(2) dEC/β+ → 95Mo
Iso → 95Tc		96.12(32) %
3.88(32) %		1.730 MeV
0.039 MeV
Tc-964.28(7) dEC/β+ → 96Mo100 %2.973(5) MeVAL
Tc-96m51.5(10) minEC/β+ → 96Mo
Iso → 96Tc		2.0(5) %
98.0(5) %		3.007 MeV
0.034 MeV
Tc-974.21(16) × 106 aEC → 97Mo100 %0.320(4) MeVAL
Tc-97m91.0(6) dEC → 97Mo
Iso → 97Tc		3.94(18) %
96.06(18) %		0.417 MeV
0.097 MeV
Tc-984.2(3) × 106 aβ- → 98Ru100 %1.793(7) MeVAL
Tc-98m14.7(3) μs
Tc-992.111(12) × 105 aβ- → 99Ru100 %0.2975(9) MeVAL
Tc-99m6.0072(9) hβ- → 99Ru
Iso → 99Tc		0.0037(6) %
99.9963(6) %		0.4402(9) MeV
0.1426836(11) MeV
Tc-10015.46(19) sβ- → 100Ru
EC → 100Mo		99.9982(9) %
0.0018(9) %		3.2064(14) MeV
0.1721(14) MeV		AL
Tc-100m18.32(14) μsIso → 100Tc100 %
Tc-100m23.2(2) μsIso → 100Tc100 %
Tc-10114.22(1) minβ- → 101Ru100 %1.614(24) MeVAL
Tc-101m636(8) μsIso → 101Tc100 %0.207 MeV
Tc-1025.28(15) sβ- → 102Ru100 %4.534(9) MeVAL
Tc-102m4.35(7) minβ- → 102Ru
Iso → 102Tc		98(2) %
2(2) %		4.530 MeV
?
Tc-10354.2(8) sβ- → 103Ru100 %2.663(10) MeVAL
Tc-10418.3(3) minβ- → 104Ru100 %5.592(25) MeVAL
Tc-104m13.5(3) μs
Tc-104m20.40(2) μs
Tc-1057.6(1) minβ- → 105Ru100 %3.64(4) MeVAL
Tc-10635.6(6) sβ- → 106Ru100 %6.547(11) MeVAL
Tc-10721.2(2) sβ- → 107Ru100 %5.113(12) MeVAL
Tc-107m13.85(5) μs
Tc-107m2184(3) ns
Tc-1085.17(7) sβ- → 108Ru100 %7.739(12) MeVAL
Tc-1090.91(3) sβ- → 109Ru
β-, n → 108Ru		< 100 %
0.08(2) %		6.456(13) MeV
1.307(12) MeV		AL
Tc-110900(13) msβ- → 110Ru
β-, n → 109Ru		99.96 %
0.04(2) %		9.038(13) MeV
1.633(13) MeV		AL
Tc-111290(20) msβ- → 111Ru
β-, n → 110Ru		99.15 %
0.85(20) %		7.761(14) MeV
2.977(13) MeV		AL
Tc-112271(15) msβ- → 112Ru
β-, n → 111Ru		98.5 % %
1.5(2) %		10.372(11) MeV
3.455(11) MeV		AL
Tc-112m150(17) nsIso → 112Tc100 %
Tc-113152(8) msβ- → 113Ru
β-, n → 112Ru		97.9 %
2.1(3) %		9.06(4) MeV
4.748(10) MeV		AL
Tc-113m0.526 μsIso → 113Tc100 %
Tc-1140.100 s
0.090 s		β- → 114Ru
β-, n → 113Ru
?		11.62(43) MeV
5.20(43) MeV		AL
Tc-11578(2) msβ- → 115Ru
β-, n → 114Ru
?		9.87(79) MeV
5.83(79) MeV		AL
Tc-11657(3) msβ- → 116Ru
β-, n → 115Ru
β-, 2n → 114Ru

12.62(30) MeV
6.66(31) MeV
AL
Tc-11744.5(20) msβ- → 117Ru
β-, n → 116Ru
β-, 2n → 117Ru

11.11(59) MeV
7.62(40) MeV
AL
Tc-11830(4) msβ- → 118Ru
β-, n → 117Ru
β-, 2n → 116Ru

13.47(45) MeV
7.63(59) MeV
AL
Tc-11922(3) msβ- → 119Ru
β-, n → 118Ru
β-, 2n → 117Ru

12.19(58) MeV
8.82(54) MeV
AL
Tc-12021(5) msβ- → 120Ru
β-, n → 119Ru
β-, 2n → 118Ru

14.49(64) MeV
8.97(58) MeV
AL
Tc-12122(6) msβ- → 121Ru
β-, n → 120Ru
β-, 2n → 119Ru

13.27(64) MeV
10.16(64) MeV

 

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 Technetium 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 Technetium 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 Technetium 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)
99Tc

9/2+		+5,6847(4)
{- 0,129(6)}		9,62940,38174
7,4635

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

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 Technetium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Tc-93106 Bq10 Bq/g2.8 h
Tc-93m106 Bq10 Bq/g43.5 min
Tc-94106 Bq10 Bq/g4.9 h
Tc-94m105 Bq10 Bq/g52.0 min
Tc-95106 Bq10 Bq/g20.0 h
Tc-95m+106 Bq1 Bq/g0,1 TBqTc-9561.0 d
Tc-96106 Bq1 Bq/g0,03 TBq1 Bq cm-24.3 d
Tc-96m107 Bq1000 Bq/g0,03 TBq100 Bq cm-251.5 min
Tc-97108 Bq10 Bq/gUnbegrenzt (UL)100 Bq cm-22.6 × 106 a
Tc-97m107 Bq100 Bq/g40 TBq100 Bq cm-290.2 d
Tc-99107 Bq1 Bq/g30 TBq100 Bq cm-22.1 × 105 a
Tc-99m107 Bq100 Bq/g0,7 TBq10 Bq cm-26.0 h
Tc-101106 Bq100 Bq/g14.2 min
Tc-104105 Bq10 Bq/g18.3 min

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

 

Literature Sources and References

Properties of the Technetium 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.

Technetium: NMR properties - 99Tc-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.

 

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