Isotopes_of_ruthenium, Isotopes_of_ruthenium Information, Isotopes_of


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Naturally occurring ruthenium (Ru) is composed of seven isotopes. The most stable radioisotopes are ¹⁰⁶Ru with a half-life of 373.59 days, ¹⁰³Ru with a half-life of 39.26 days and ⁹⁷Ru with a half-life of 2.9 days.

Fifteen other radioisotopes have been characterized with atomic weights ranging from 89.93 u (⁹⁰Ru) to 114.928 u (¹¹⁵Ru). Most of these have half-lives that are less than five minutes except ⁹⁵Ru (half-life: 1.643 hours) and ¹⁰⁵Ru (half-life: 4.44 hours).

The primary decay mode before the most abundant isotope, ¹⁰²Ru, is electron capture and the primary mode after is beta emission. The primary decay product before ¹⁰²Ru is technetium and the primary mode after is rhodium.
Standard atomic mass: 101.07(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)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
⁸⁷Ru	44	43	86.94918(64)#	50# ms [>1.5 µs]	1/2-#
⁸⁸Ru	44	44	87.94026(43)#	1.3(3) s [1.2(+3-2) s]	0+
⁸⁹Ru	44	45	88.93611(54)#	1.38(11) s	(7/2)(+#)
⁹⁰Ru	44	46	89.92989(32)#	11.7(9) s	0+
⁹¹Ru	44	47	90.92629(63)#	7.9(4) s	(9/2+)
^91mRu	80(300)# keV			7.6(8) s	(1/2-)
⁹²Ru	44	48	91.92012(32)#	3.65(5) min	0+
⁹³Ru	44	49	92.91705(9)	59.7(6) s	(9/2)+
^93m1Ru	734.40(10) keV			10.8(3) s	(1/2)-
^93m2Ru	2082.6(9) keV			2.20(17) µs	(21/2)+
⁹⁴Ru	44	50	93.911360(14)	51.8(6) min	0+
^94mRu	2644.55(25) keV			71(4) µs	(8+)
⁹⁵Ru	44	51	94.910413(13)	1.643(14) h	5/2+
⁹⁶Ru	44	52	95.907598(8)	STABLE [>67E+15 a]	0+	0.0554(14)
⁹⁷Ru	44	53	96.907555(9)	2.791(4) d	5/2+
⁹⁸Ru	44	54	97.905287(7)	STABLE	0+	0.0187(3)
⁹⁹Ru	44	55	98.9059393(22)	STABLE	5/2+	0.1276(14)
¹⁰⁰Ru	44	56	99.9042195(22)	STABLE	0+	0.1260(7)
¹⁰¹Ru	44	57	100.9055821(22)	STABLE	5/2+	0.1706(2)
^101mRu	527.56(10) keV			17.5(4) µs	11/2-
¹⁰²Ru	44	58	101.9043493(22)	STABLE	0+	0.3155(14)
¹⁰³Ru	44	59	102.9063238(22)	39.26(2) d	3/2+
^103mRu	238.2(7) keV			1.69(7) ms	11/2-
¹⁰⁴Ru	44	60	103.905433(3)	STABLE	0+	0.1862(27)
¹⁰⁵Ru	44	61	104.907753(3)	4.44(2) h	3/2+
¹⁰⁶Ru	44	62	105.907329(8)	373.59(15) d	0+
¹⁰⁷Ru	44	63	106.90991(13)	3.75(5) min	(5/2)+
¹⁰⁸Ru	44	64	107.91017(12)	4.55(5) min	0+
¹⁰⁹Ru	44	65	108.91320(7)	34.5(10) s	(5/2+)#
¹¹⁰Ru	44	66	109.91414(6)	11.6(6) s	0+
¹¹¹Ru	44	67	110.91770(8)	2.12(7) s	(5/2+)
¹¹²Ru	44	68	111.91897(8)	1.75(7) s	0+
¹¹³Ru	44	69	112.92249(8)	0.80(5) s	(5/2+)
^113mRu	130(18) keV			510(30) ms	(11/2-)
¹¹⁴Ru	44	70	113.92428(25)#	0.53(6) s	0+
¹¹⁵Ru	44	71	114.92869(14)	740(80) ms
¹¹⁶Ru	44	72	115.93081(75)#	400# ms [>300 ns]	0+
¹¹⁷Ru	44	73	116.93558(75)#	300# ms [>300 ns]
¹¹⁸Ru	44	74	117.93782(86)#	200# ms [>300 ns]	0+
¹¹⁹Ru	44	75	118.94284(75)#	170# ms [>300 ns]
¹²⁰Ru	44	76	119.94531(86)#	80# 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 technetium	Isotopes of ruthenium	Isotopes of rhodium
Index to isotope pages

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