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Isotopes of iridium



There are two natural isotopes of Iridium (Ir), and many radioisotopes, the most stable radioisotope being Ir-192 with a half-life of 73.83 days. Ir-192 beta decays into platinum-192, while most of the other radioisotopes decay into osmium.
Standard atomic mass: 192.217(3) u

Additional recommended knowledge

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
164Ir 77 87 163.99220(44)# 1# ms 2-#
164mIr 270(110)# keV 94(27) µs 9+#
165Ir 77 88 164.98752(23)# <1# µs 1/2+#
165mIr 180(50)# keV 300(60) µs 11/2-
166Ir 77 89 165.98582(22)# 10.5(22) ms (2-)
166mIr 172(6) keV 15.1(9) ms (9+)
167Ir 77 90 166.981665(20) 35.2(20) ms 1/2+
167mIr 175.3(22) keV 30.0(6) ms 11/2-
168Ir 77 91 167.97988(16)# 161(21) ms high
168mIr 50(100)# keV 125(40) ms low
169Ir 77 92 168.976295(28) 780(360) ms [0.64(+46-24) s] 1/2+#
169mIr 154(24) keV 308(22) ms 11/2-#
170Ir 77 93 169.97497(11)# 910(150) ms [0.87(+18-12) s] low#
170mIr 270(70)# keV 440(60) ms high#
171Ir 77 94 170.97163(4) 3.6(10) s [3.2(+13-7) s] 1/2+#
171mIr 180(30)# keV 1.40(10) s (11/2-)
172Ir 77 95 171.97046(11)# 4.4(3) s (3+)
172mIr 280(100)# keV 2.0(1) s (7+)
173Ir 77 96 172.967502(15) 9.0(8) s (3/2+,5/2+)
173mIr 253(27) keV 2.20(5) s (11/2-)
174Ir 77 97 173.966861(30) 7.9(6) s (3+)
174mIr 193(11) keV 4.9(3) s (7+)
175Ir 77 98 174.964113(21) 9(2) s (5/2-)
176Ir 77 99 175.963649(22) 8.3(6) s
177Ir 77 100 176.961302(21) 30(2) s 5/2-
178Ir 77 101 177.961082(21) 12(2) s
179Ir 77 102 178.959122(12) 79(1) s (5/2)-
180Ir 77 103 179.959229(23) 1.5(1) min (4,5)(+#)
181Ir 77 104 180.957625(28) 4.90(15) min (5/2)-
182Ir 77 105 181.958076(23) 15(1) min (3+)
183Ir 77 106 182.956846(27) 57(4) min 5/2-
184Ir 77 107 183.95748(3) 3.09(3) h 5-
184m1Ir 225.65(11) keV 470(30) µs 3+
184m2Ir 328.40(24) keV 350(90) ns (7)+
185Ir 77 108 184.95670(3) 14.4(1) h 5/2-
186Ir 77 109 185.957946(18) 16.64(3) h 5+
186mIr 0.8(4) keV 1.92(5) h 2-
187Ir 77 110 186.957363(7) 10.5(3) h 3/2+
187m1Ir 186.15(4) keV 30.3(6) ms 9/2-
187m2Ir 433.81(9) keV 152(12) ns 11/2-
188Ir 77 111 187.958853(8) 41.5(5) h 1-
188mIr 970(30) keV 4.2(2) ms 7+#
189Ir 77 112 188.958719(14) 13.2(1) d 3/2+
189m1Ir 372.18(4) keV 13.3(3) ms 11/2-
189m2Ir 2333.3(4) keV 3.7(2) ms (25/2)+
190Ir 77 113 189.9605460(18) 11.78(10) d 4-
190m1Ir 26.1(1) keV 1.120(3) h (1-)
190m2Ir 36.154(25) keV >2 µs (4)+
190m3Ir 376.4(1) keV 3.087(12) h (11)-
191Ir 77 114 190.9605940(18) STABLE 3/2+ 0.373(2)
191m1Ir 171.24(5) keV 4.94(3) s 11/2-
191m2Ir 2120(40) keV 5.5(7) s
192Ir 77 115 191.9626050(18) 73.827(13) d 4+
192m1Ir 56.720(5) keV 1.45(5) min 1-
192m2Ir 168.14(12) keV 241(9) a (11-)
193Ir 77 116 192.9629264(18) STABLE 3/2+ 0.627(2)
193mIr 80.240(6) keV 10.53(4) d 11/2-
194Ir 77 117 193.9650784(18) 19.28(13) h 1-
194m1Ir 147.078(5) keV 31.85(24) ms (4+)
194m2Ir 370(70) keV 171(11) d (10,11)(-#)
195Ir 77 118 194.9659796(18) 2.5(2) h 3/2+
195mIr 100(5) keV 3.8(2) h 11/2-
196Ir 77 119 195.96840(4) 52(1) s (0-)
196mIr 210(40) keV 1.40(2) h (10,11-)
197Ir 77 120 196.969653(22) 5.8(5) min 3/2+
197mIr 115(5) keV 8.9(3) min 11/2-
198Ir 77 121 197.97228(21)# 8(1) s
199Ir 77 122 198.97380(4) 20# s 3/2+#

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 osmium Isotopes of iridium Isotopes of platinum
Index to isotope pages
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_iridium". A list of authors is available in Wikipedia.
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