Isotopes of selenium

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Selenium (Se)
Standard atomic mass: 78.96(3) 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)
	excitation energy
65Se	34	31	64.96466(64)#	<50 ms	3/2-#
66Se	34	32	65.95521(32)#	33(12) ms	0+
67Se	34	33	66.95009(21)#	133(11) ms	5/2-#
68Se	34	34	67.94180(4)	35.5(7) s	0+
69Se	34	35	68.93956(4)	27.4(2) s	(1/2-)
69m1Se	39.4(1) keV			2.0(2) µs	5/2-
69m2Se	573.9(10) keV			955(16) ns	9/2+
70Se	34	36	69.93339(7)	41.1(3) min	0+
71Se	34	37	70.93224(3)	4.74(5) min	5/2-
71m1Se	48.79(5) keV			5.6(7) µs	1/2- to 9/2-
71m2Se	260.48(10) keV			19.0(5) µs	(9/2)+
72Se	34	38	71.927112(13)	8.40(8) d	0+
73Se	34	39	72.926765(11)	7.15(8) h	9/2+
73mSe	25.71(4) keV			39.8(13) min	3/2-
74Se	34	40	73.9224764(18)	STABLE	0+	0.0089(4)
75Se	34	41	74.9225234(18)	119.779(4) d	5/2+
76Se	34	42	75.9192136(18)	STABLE	0+	0.0937(29)
77Se	34	43	76.9199140(18)	STABLE	1/2-	0.0763(16)
77mSe	161.9223(7) keV			17.36(5) s	7/2+
78Se	34	44	77.9173091(18)	STABLE	0+	0.2377(28)
79Se	34	45	78.9184991(18)	2.95(38)E+5 a	7/2+
79mSe	95.77(3) keV			3.92(1) min	1/2-
80Se	34	46	79.9165213(21)	STABLE	0+	0.4961(41)
81Se	34	47	80.9179925(22)	18.45(12) min	1/2-
81mSe	102.99(6) keV			57.28(2) min	7/2+
82Se	34	48	81.9166994(22)	97(5)E+18 a	0+	0.0873(22)
83Se	34	49	82.919118(4)	22.3(3) min	9/2+
83mSe	228.50(20) keV			70.1(4) s	1/2-
84Se	34	50	83.918462(16)	3.1(1) min	0+
85Se	34	51	84.92225(3)	31.7(9) s	(5/2+)#
86Se	34	52	85.924272(17)	15.3(9) s	0+
87Se	34	53	86.92852(4)	5.50(12) s	(5/2+)#
88Se	34	54	87.93142(5)	1.53(6) s	0+
89Se	34	55	88.93645(32)#	0.41(4) s	(5/2+)#
90Se	34	56	89.93996(43)#	300# ms [>300 ns]	0+
91Se	34	57	90.94596(54)#	270(50) ms	1/2+#
92Se	34	58	91.94992(64)#	100# ms [>300 ns]	0+
93Se	34	59	92.95629(86)#	50# ms [>300 ns]	1/2+#
94Se	34	60	93.96049(86)#	20# ms [>300 ns]	0+

[edit] Notes

• The precision of the isotope abundances and atomic mass is limited through variations. The given ranges should be applicable to any normal terrestrial material.
• 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.

Isotopes of arsenic	Isotopes of selenium	Isotopes of bromine
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