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Isotopes of Technetium

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

 

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

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
85Tc438542Technetium-8584.95078(43) u
[84.9271922 u]
{-45.84813 MeV}
86Tc438643Technetium-8685.94464(32) u
[85.9210522 u]
{-51.56751 MeV}
(0+)
86mTc438643Technetium-86m85.94464(32) u
[85.9210522 u]
{-51.56751 MeV}
(6+)
87Tc438744Technetium-8786.938067(4) u
[86.9144792 u]
{-57.69022 MeV}
(9/2+)
87mTc438744Technetium-87m86.938067(4) u
[86.9144792 u]
{-57.69022 MeV}
(7/2+)
88Tc438845Technetium-8887.93378(16) u
[87.9101922 u]
{-61.68353 MeV}
X: (5+,6+,7+)
Y: (2+, 3+)
88mTc438845Technetium-88m87.93268(22) u
[87.9090922 u]
{-62.70818 MeV}
89Tc438946Technetium-8988.927649(4) u
[88.9040612 u]
{-67.39452 MeV}
(9/2+)
89mTc438946Technetium-89m88.927649(4) u
[88.9040612 u]
{-67.39452 MeV}
(1/2-)
90Tc439047Technetium-9089.9240739(11) u
[89.9004861 u]
{-70.72471 MeV}
(8+)
90mTc439047Technetium-90m89.9240739(11) u
[89.9004861 u]
{-70.72471 MeV}
1+90Ru
91Tc439148Technetium-9190.9184250(25) u
[90.8948372 u]
{-75.98662 MeV}
(9/2)+91Ru
91mTc439148Technetium-91m90.9184250(25) u
[90.8948372 u]
{-75.98662 MeV}
(1/2)-
92Tc439249Technetium-9291.915270(3) u
[91.8916822 u]
{-78.92549 MeV}
(8)+92Ru
92mTc439249Technetium-92m91.915270(3) u
[91.8916822 u]
{-78.92549 MeV}
(4+)
93Tc439350Technetium-9392.9102451(11) u
[92.8866573 u]
{-83.60615 MeV}
9/2+6.32(6)93Ru
93m1Tc439350Technetium-93m192.9102451(11) u
[92.8866573 u]
{-83.60615 MeV}
1/2-
93m2Tc439350Technetium-93m292.9102451(11) u
[92.8866573 u]
{-83.60615 MeV}
(17/2)-+10.46(5)
94Tc439451Technetium-9493.909652(4) u
[93.8860642 u]
{-84.15862 MeV}
7+5.12(5)94Ru
94mTc439451Technetium-94m93.909652(4) u
[93.8860642 u]
{-84.15862 MeV}
(2)+
95Tc439552Technetium-9594.907652(5) u
[94.8840642 u]
{-86.02161 MeV}
9/2+5.94(6)95Ru
95mTc439552Technetium-95m94.907652(5) u
[94.8840642 u]
{-86.02161 MeV}
1/2-
96Tc439653Technetium-9695.907867(6) u
[95.8842792 u]
{-85.82134 MeV}
7++ 5.09(5)96Ru
96mTc439653Technetium-96m95.907867(6) u
[95.8842792 u]
{-85.82134 MeV}
4+
97Tc439754Technetium-9796.906361(4) u
[96.8827732 u]
{-87.22417 MeV}
9/2+5.82(9)97Ru
97mTc439754Technetium-97m96.906361(4) u
[96.8827732 u]
{-87.22417 MeV}
1/2-
98Tc439855Technetium-9897.90721(3) u
[97.8836222 u]
{-86.43333 MeV}
(6)+
98mTc439855Technetium-98m97.90721(3) u
[97.8836222 u]
{-86.43333 MeV}
(2)-
99Tc439956Technetium-9998.9062497(10) u
[98.8826619 u]
{-87.32784 MeV}
9/2++5.678(2)99Mo
99mTc439956Technetium-99m98.9062547(21) u
[98.8826669 u]
{-87.32318 MeV}
1/2-
100Tc4310057Technetium-10099.9076527(14) u
[99.8840649 u]
{-86.02096 MeV}
1+
100m1Tc4310057Technetium-100m199.9076527(14) u
[99.8840649 u]
{-86.02096 MeV}
(4)+
100m2Tc4310057Technetium-100m299.9076527(14) u
[99.8840649 u]
{-86.02096 MeV}
(6)+
101Tc4310158Technetium-101100.907305(26) u
[100.8837172 u]
{-86.34484 MeV}
9/2+101Mo
101mTc4310158Technetium-101m100.907305(26) u
[100.8837172 u]
{-86.34484 MeV}
1/2-
102Tc4310259Technetium-102101.909207(10) u
[101.8856192 u]
{-84.57313 MeV}
1+102Mo
102mTc4310259Technetium-102m101.909207(10) u
[101.8856122 u]
{-84.57966 MeV}
(4,5)
103Tc4310360Technetium-103102.909174(11) u
[102.8855862 u]
{-84.60387 MeV}
5/2+103Mo
104Tc4310461Technetium-104103.911429(27) u
[103.8878412 u]
{-82.50336 MeV}
(3+)104Mo
104m1Tc4310461Technetium-104m1103.911429(27) u
[103.8878412 u]
{-82.50336 MeV}
(+)
104m2Tc4310461Technetium-104m2103.911429(27) u
[103.8878412 u]
{-82.50336 MeV}
(+)
105Tc4310562Technetium-105104.91166(4) u
[104.8880722 u]
{-82.28818 MeV}
(3/2-)105Mo
106Tc4310663Technetium-106105.914357(13) u
[105.8907692 u]
{-79.77594 MeV}
(1,2)106Mo
107Tc4310764Technetium-107106.915458(9) u
[106.8918702 u]
{-78.75037 MeV}
(3/2-)107Mo
107m1Tc4310764Technetium-107m1106.915458(9) u
[106.8918702 u]
{-78.75037 MeV}
(1/2+)
107m2Tc4310764Technetium-107m2106.915458(9) u
[106.8918702 u]
{-78.75037 MeV}
(5/2+)
108Tc4310865Technetium-108107.918494(9) u
[107.8949062 u]
{-75.92235 MeV}
(2)+108Mo
109Tc4310966Technetium-109108.920254(10) u
[108.8966662 u]
{-74.28292 MeV}
(5/2+)
110Tc4311067Technetium-110109.923741(10) u
[109.9001532 u]
{-71.0348 MeV}
(2,3+)110Mo
111Tc4311168Technetium-111110.925899(11) u
[110.9023112 u]
{-69.02464 MeV}
(5/2+)
112Tc4311269Technetium-112111.929942(6) u
[111.9063542 u]
{-65.25861 MeV}
(2+)
112mTc4311269Technetium-112m111.929942(6) u
[111.9063542 u]
{-65.25861 MeV}
(5+)
113Tc4311370Technetium-113112.932569(4) u
[112.9089812 u]
{-62.81157 MeV}
(5/2+)
113mTc4311370Technetium-113m112.932569(4) u
[112.9089812 u]
{-62.81157 MeV}
(5/2-)
114Tc4311471Technetium-114113.93709(46) u
[113.9135022 u]
{-58.60029 MeV}
≥4
(1+)
115Tc4311572Technetium-115114.93954(85) u
[114.9159522 u]
{-56.31813 MeV}
116Tc4311673Technetium-116115.94476(32) u
[115.9211722 u]
{-51.45573 MeV}
117Tc4311774Technetium-117116.94806(43) u
[116.9244722 u]
{-48.3818 MeV}
(5/2+)
118Tc4311875Technetium-118117.95299(43) u
[117.9294022 u]
{-43.78953 MeV}
119Tc4311976Technetium-119118.95666(54) u
[118.9330722 u]
{-40.37095 MeV}
120Tc4312077Technetium-120119.96187(54) u
[119.9382822 u]
{-35.51787 MeV}
121Tc4312178Technetium-121120.96588(54) u
[120.9422922 u]
{-31.78258 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
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 %1534 keV
Tc-872.2(2) sEC/β+87Mo100 %9.195(5) MeVAL
Tc-87m647(24) nsIso → 87Tc100 %71+x keV
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 %W+95 keV
Tc-8912.8(9) sEC/β+89Mo100 %7.62(5) MeVAL
Tc-89m12.9(8) sEC, β+89Mo
Iso → 89Tc
100 %
< 0.01 %

62.6(5) keV
Tc-9049.2(4) sEC/β+90Mo100 %9.448(4) MeVAL
Tc-90m8.7(2) sEC/β+90Mo100 %144.1(17) keV
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
139.3(3) keV
Tc-924.25(15) minEC/β+91Mo100 %7.883(3) MeVAL
Tc-92m1.03(7) μs270.09(8)
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
391.84(8) keV
Tc-93m210.2(3) μsIso → 93Tc100 %2.185 MeV2185.16(15)
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
76(3) keV
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
38.91(4) keV
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
34.23(4) keV
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
96.57(6) keV
Tc-984.2(3) × 106 aβ-98Ru100 %1.793(7) MeVAL
Tc-98m14.7(3) μs90.76(16) keV
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
0.14263(11) MeV
142.6836(11) keV
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 %200.67(4) keV
Tc-100m23.2(2) μsIso → 100Tc100 %243.95(4) keV
Tc-10114.22(1) minβ-101Ru100 %1.614(24) MeVAL
Tc-101m636(8) μsIso → 101Tc100 %0.207 MeV207.526(20) keV
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
?
+x keV
Tc-10354.2(8) sβ-103Ru100 %2.663(10) MeVAL
Tc-10418.3(3) minβ-104Ru100 %5.592(25) MeVAL
Tc-104m13.5(3) μs69.7(2) keV
Tc-104m20.40(2) μs106.1(3) keV
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) μs30.1(1) keV
Tc-107m2184(3) ns65.72(14) keV
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 %350.0(15) keV
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 %114.4(5) keV
Tc-1140.100 s
0.090 s
β-114Ru
β-, n → 113Ru

?
11.62(43) MeV
5.20(43) MeV
+x
+y
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 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Technetium isotope.
6 - 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.
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 Technetium 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 Technetium 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)
99Tc

9/2+
+5,678(2)- 12,9(6)9,62940,38174
7,4635

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 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.

 


Category: Isotopes

Last update: 05.07.2020



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