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Isotopes of tellurium



There are 30 known isotopes of Tellurium (Te) with atomic masses that range from 108 to 137. Naturally found tellurium consists of eight isotopes (listed in the table to the right); three of them are observed to be radioactive. 128Te has the longest known half-life, 2.2×1024 years (approx. 22 sextillion years), among all radioactive isotopes. Tellurium is the first element which can undergo Alpha Decay, with isotopes 106Te to 110Te being able to undergo this mode of decay.

Additional recommended knowledge


Standard atomic mass: 127.60(3) u

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
105Te 52 53 104.94364(54)# 1# µs 5/2+#
106Te 52 54 105.93750(14) 70(20) µs [70(+20-10) µs] 0+
107Te 52 55 106.93501(32)# 3.1(1) ms 5/2+#
108Te 52 56 107.92944(11) 2.1(1) s 0+
109Te 52 57 108.92742(7) 4.6(3) s (5/2+)
110Te 52 58 109.92241(6) 18.6(8) s 0+
111Te 52 59 110.92111(8) 19.3(4) s (5/2)+#
112Te 52 60 111.91701(18) 2.0(2) min 0+
113Te 52 61 112.91589(3) 1.7(2) min (7/2+)
114Te 52 62 113.91209(3) 15.2(7) min 0+
115Te 52 63 114.91190(3) 5.8(2) min 7/2+
115m1Te 10(7) keV 6.7(4) min (1/2)+
115m2Te 280.05(20) keV 7.5(2) µs 11/2-
116Te 52 64 115.90846(3) 2.49(4) h 0+
117Te 52 65 116.908645(14) 62(2) min 1/2+
117mTe 296.1(5) keV 103(3) ms (11/2-)
118Te 52 66 117.905828(16) 6.00(2) d 0+
119Te 52 67 118.906404(9) 16.05(5) h 1/2+
119mTe 260.96(5) keV 4.70(4) d 11/2-
120Te 52 68 119.90402(1) STABLE [>2.2E+16 a] 0+ 0.0009(1)
121Te 52 69 120.904936(28) 19.16(5) d 1/2+
121mTe 293.991(22) keV 154(7) d 11/2-
122Te 52 70 121.9030439(16) STABLE 0+ 0.0255(12)
123Te 52 71 122.9042700(16) >600E+12 a 1/2+ 0.0089(3)
123mTe 247.47(4) keV 119.2(1) d 11/2-
124Te 52 72 123.9028179(16) STABLE 0+ 0.0474(14)
125Te 52 73 124.9044307(16) STABLE 1/2+ 0.0707(15)
125mTe 144.772(9) keV 57.40(15) d 11/2-
126Te 52 74 125.9033117(16) STABLE 0+ 0.1884(25)
127Te 52 75 126.9052263(16) 9.35(7) h 3/2+
127mTe 88.26(8) keV 109(2) d 11/2-
128Te 52 76 127.9044631(19) 2.2(3)E+24 a 0+ 0.3174(8)
128mTe 2790.7(4) keV 370(30) ns 10+
129Te 52 77 128.9065982(19) 69.6(3) min 3/2+
129mTe 105.50(5) keV 33.6(1) d 11/2-
130Te 52 78 129.9062244(21) 790(100)E+18 a 0+ 0.3408(62)
130m1Te 2146.41(4) keV 115(8) ns (7)-
130m2Te 2661(7) keV 1.90(8) µs (10+)
130m3Te 4375.4(18) keV 261(33) ns
131Te 52 79 130.9085239(21) 25.0(1) min 3/2+
131mTe 182.250(20) keV 30(2) h 11/2-
132Te 52 80 131.908553(7) 3.204(13) d 0+
133Te 52 81 132.910955(26) 12.5(3) min (3/2+)
133mTe 334.26(4) keV 55.4(4) min (11/2-)
134Te 52 82 133.911369(11) 41.8(8) min 0+
134mTe 1691.34(16) keV 164.1(9) ns 6+
135Te 52 83 134.91645(10) 19.0(2) s (7/2-)
135mTe 1554.88(17) keV 510(20) ns (19/2-)
136Te 52 84 135.92010(5) 17.63(8) s 0+
137Te 52 85 136.92532(13) 2.49(5) s 3/2-#
138Te 52 86 137.92922(22)# 1.4(4) s 0+
139Te 52 87 138.93473(43)# 500# ms [>300 ns] 5/2-#
140Te 52 88 139.93885(32)# 300# ms [>300 ns] 0+
141Te 52 89 140.94465(43)# 100# ms [>300 ns] 5/2-#
142Te 52 90 141.94908(64)# 50# ms [>300 ns] 0+

Notes

  • Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

  • Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
  • Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
  • Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
    • Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
    • National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
    • David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


Isotopes of antimony Isotopes of tellurium Isotopes of iodine
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_tellurium". A list of authors is available in Wikipedia.
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