Isotopes of tellurium

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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. 2.2 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.

Standard atomic mass: 127.60(3) u

1 Table
- 1.1 Notes
2 References
3 See also

[edit] 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)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
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+

[edit] 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.

[edit] 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.