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Isotopes of yttrium



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.

Additional recommended knowledge

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

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
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]

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.

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 strontium Isotopes of yttrium Isotopes of zirconium
Index to isotope pages
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_yttrium". A list of authors is available in Wikipedia.
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