Isotopes of yttrium

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Natural yttrium (Y) is composed of only one isotope (Y-89). The most stable radioisotopes are Y-88 which has a half life of 106.65 days and Y-91 with a half life of 58.51 days. All the other isotopes have half lives of less than a day except Y-87 which has a half life of 79.8 hours. The dominant decay mode below the stable Y-89 is electron capture and the dominant mode after it is beta emission. Twenty six unstable isotopes have been characterized.

Y-90 exists in equilibrium with its parent isotope strontium-90, which is a product of nuclear explosions.
Standard atomic mass: 88.90585(2) u

[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)
⁷⁶Y	39	37	75.95845(54)#	500# ns [>170 ns]
⁷⁷Y	39	38	76.94965(7)#	63(17) ms	5/2+#
⁷⁸Y	39	39	77.94361(43)#	54(5) ms	(0+)
^78mY	0(500)# keV			5.8(5) s	5+#
⁷⁹Y	39	40	78.93735(48)	14.8(6) s	(5/2+)#
⁸⁰Y	39	41	79.93428(19)	30.1(5) s	4-
^80m1Y	228.5(1) keV			4.8(3) s	(1-)
^80m2Y	312.6(9) keV			4.7(3) µs	(2+)
⁸¹Y	39	42	80.92913(7)	70.4(10) s	(5/2+)
⁸²Y	39	43	81.92679(11)	8.30(20) s	1+
^82m1Y	402.63(14) keV			268(25) ns	4-
^82m2Y	507.50(13) keV			147(7) ns	6+
⁸³Y	39	44	82.92235(5)	7.08(6) min	9/2+
^83mY	61.98(11) keV			2.85(2) min	(3/2-)
⁸⁴Y	39	45	83.92039(10)	4.6(2) s	1+
^84mY	-80(190) keV			39.5(8) min	(5-)
⁸⁵Y	39	46	84.916433(20)	2.68(5) h	(1/2)-
^85m1Y	19.8(5) keV			4.86(13) h	9/2+
^85m2Y	266.30(20) keV			178(6) ns	5/2-
⁸⁶Y	39	47	85.914886(15)	14.74(2) h	4-
^86m1Y	218.30(20) keV			48(1) min	(8+)
^86m2Y	302.2(5) keV			125(6) ns	(7-)
⁸⁷Y	39	48	86.9108757(17)	79.8(3) h	1/2-
^87mY	380.82(7) keV			13.37(3) h	9/2+
⁸⁸Y	39	49	87.9095011(20)	106.616(13) d	4-
^88m1Y	674.55(4) keV			13.9(2) ms	(8)+
^88m2Y	392.86(9) keV			300(3) µs	1+
⁸⁹Y	39	50	88.9058483(27)	STABLE	1/2-	1.0000
^89mY	908.97(3) keV			15.663(5) s	9/2+
⁹⁰Y	39	51	89.9071519(27)	64.053(20) h	2-
^90mY	681.67(10) keV			3.19(6) h	7+
⁹¹Y	39	52	90.907305(3)	58.51(6) d	1/2-
^91mY	555.58(5) keV			49.71(4) min	9/2+
⁹²Y	39	53	91.908949(10)	3.54(1) h	2-
⁹³Y	39	54	92.909583(11)	10.18(8) h	1/2-
^93mY	758.719(21) keV			820(40) ms	7/2+
⁹⁴Y	39	55	93.911595(8)	18.7(1) min	2-
⁹⁵Y	39	56	94.912821(8)	10.3(1) min	1/2-
⁹⁶Y	39	57	95.915891(25)	5.34(5) s	0-
^96mY	1140(30) keV			9.6(2) s	(8)+
⁹⁷Y	39	58	96.918134(13)	3.75(3) s	(1/2-)
^97m1Y	667.51(23) keV			1.17(3) s	(9/2)+
^97m2Y	3523.3(4) keV			142(8) ms	(27/2-)
⁹⁸Y	39	59	97.922203(26)	0.548(2) s	(0)-
^98m1Y	170.74(6) keV			620(80) ns	(2)-
^98m2Y	410(30) keV			2.0(2) s	(5+,4-)
^98m3Y	496.19(15) keV			7.6(4) µs	(2-)
^98m4Y	1181.1(4) keV			0.83(10) µs	(8-)
⁹⁹Y	39	60	98.924636(26)	1.470(7) s	(5/2+)
^99mY	2141.65(19) keV			8.6(8) µs	(17/2+)
¹⁰⁰Y	39	61	99.92776(8)	735(7) ms	1-,2-
^100mY	200(200)# keV			940(30) ms	(3,4,5)(+#)
¹⁰¹Y	39	62	100.93031(10)	426(20) ms	(5/2+)
¹⁰²Y	39	63	101.93356(9)	0.30(1) s
^102mY	200(200)# keV			360(40) ms	high
¹⁰³Y	39	64	102.93673(32)#	224(19) ms	5/2+#
¹⁰⁴Y	39	65	103.94105(43)#	180(60) ms
¹⁰⁵Y	39	66	104.94487(54)#	60# ms [>300 ns]	5/2+#
¹⁰⁶Y	39	67	105.94979(75)#	50# ms [>300 ns]
¹⁰⁷Y	39	68	106.95414(54)#	30# ms [>300 ns]	5/2+#
¹⁰⁸Y	39	69	107.95948(86)#	20# [>300 ns]

[edit] Notes

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.