Isotopes of indium

Isotopes of indium (₄₉In)
Standard atomic weight Ar°(In)
	114.818±0.001; 114.82±0.01 (abridged);
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Indium (₄₉In) consists of two primordial nuclides, with the most common (~ 95.7%) nuclide (¹¹⁵In) being measurably though weakly radioactive. Its spin-forbidden decay has a half life of 4,41×10¹⁴ years.

The stable isotope ¹¹³In is only 4.3% of naturally occurring indium. Among elements with a known stable isotope, only tellurium and rhenium similarly occur with a stable isotope in lower abundance than the long-lived radioactive isotope. Other than ¹¹⁵In, the longest-lived radioisotope is ¹¹¹In, with a half-life of 2.8047 days. All other radioisotopes have half-lives less than a day. This element also has 47 isomers, the longest-lived being ^114m1In, with a half-life of 49.51 days. All other meta-states have half-lives less than a day, most less than an hour, and many measured in milliseconds or less.

Indium-111 is used medically in nuclear imaging, as a radiotracer nuclide tag for gamma camera localization of protein radiopharmaceuticals, such as In-111-labeled octreotide, which binds to receptors on certain endocrine tumors (Octreoscan).^[4] Indium-111 is also used in indium white blood cell scans, which use nuclear medical techniques to search for hidden infections.

List of isotopes

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life^{[n 1]}	decay mode(s)^[5]^{[n 2]}	daughter isotope(s)^{[n 3]}	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
nuclide symbol	excitation energy			half-life^{[n 1]}	decay mode(s)^[5]^{[n 2]}	daughter isotope(s)^{[n 3]}	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
⁹⁷In	49	48	96.94954(64)#	5# ms			9/2+#
⁹⁸In	49	49	97.94214(21)#	45(23) ms [32(+32−11) ms]	β⁺	⁹⁸Cd	0+#
^98mIn	0(500)# keV			1.7(8) s [1.2(+12−4) s]
⁹⁹In	49	50	98.93422(43)#	3.1(8) s [3.0(+8-7) s]	β⁺	⁹⁹Cd	9/2+#
^99mIn	400(150)# keV			1# s			1/2−#
¹⁰⁰In	49	51	99.93111(27)	5.9(2) s	β⁺ (96.1%)	¹⁰⁰Cd	(6,7)+
¹⁰⁰In	49	51	99.93111(27)	5.9(2) s	β⁺, p (3.9%)	⁹⁹Ag	(6,7)+
¹⁰¹In	49	52	100.92634(32)#	15.1(3) s	β⁺	¹⁰⁰Cd	9/2+#
¹⁰¹In	49	52	100.92634(32)#	15.1(3) s	β⁺, p	¹⁰⁰Ag	9/2+#
^101mIn	550(100)# keV			10# s			1/2−#
¹⁰²In	49	53	101.92409(12)	23.3(1) s	β⁺ (99.99%)	¹⁰²Cd	(6+)
¹⁰²In	49	53	101.92409(12)	23.3(1) s	β⁺, p (.00929%)	¹⁰¹Ag	(6+)
¹⁰³In	49	54	102.919914(27)	60(1) s	β⁺	¹⁰³Cd	9/2+#
^103mIn	631.7(1) keV			34(2) s			(1/2−)#
¹⁰⁴In	49	55	103.91830(9)	1.80(3) min	β⁺	¹⁰⁴Cd	5,6(+)
^104mIn	93.48(10) keV			15.7(5) s	IT (80%)	¹⁰⁴In	(3+)
^104mIn	93.48(10) keV			15.7(5) s	β⁺ (20%)	¹⁰⁴Cd	(3+)
¹⁰⁵In	49	56	104.914674(19)	5.07(7) min	β⁺	¹⁰⁵Cd	9/2+
^105mIn	674.1(3) keV			48(6) s	IT	¹⁰⁵In	(1/2)−
¹⁰⁶In	49	57	105.913465(13)	6.2(1) min	β⁺	¹⁰⁶Cd	7+
^106mIn	28.6(3) keV			5.2(1) min	β⁺	¹⁰⁶Cd	(3+)
¹⁰⁷In	49	58	106.910295(12)	32.4(3) min	β⁺	¹⁰⁷Cd	9/2+
^107mIn	678.5(3) keV			50.4(6) s	IT	¹⁰⁷In	1/2−
¹⁰⁸In	49	59	107.909698(10)	58.0(12) min	β⁺	¹⁰⁸Cd	7+
^108mIn	29.75(5) keV			39.6(7) min	β⁺	¹⁰⁸Cd	2+
¹⁰⁹In	49	60	108.907151(6)	4.2(1) h	β⁺	¹⁰⁹Cd	9/2+
^109m1In	650.1(3) keV			1.34(7) min	IT	¹⁰⁹In	1/2−
^109m2In	2101.8(2) keV			209(6) ms			(19/2+)
¹¹⁰In	49	61	109.907165(13)	4.9(1) h	β⁺	¹¹⁰Cd	7+
^110mIn	62.1(5) keV			69.1(5) min	β⁺	¹¹⁰Cd	2+
¹¹¹In^{[n 4]}	49	62	110.905103(5)	2.8047(5) d	EC	¹¹¹Cd	9/2+
^111mIn	536.95(6) keV			7.7(2) min	IT	¹¹¹In	1/2−
¹¹²In	49	63	111.905532(6)	14.97(10) min	β⁺ (56%)	¹¹²Cd	1+
¹¹²In	49	63	111.905532(6)	14.97(10) min	β⁻ (44%)	¹¹²Sn	1+
^112m1In	156.59(5) keV			20.56(6) min	β⁺	¹¹²Cd	4+
^112m2In	350.76(9) keV			690(50) ns			7+
^112m3In	613.69(14) keV			2.81(3) µs			8-
¹¹³In	49	64	112.904058(3)	Stable^{[n 5]}			9/2+	0.0429(5)
^113mIn	391.699(3) keV			1.6579(4) h	IT	¹¹³In	1/2−
¹¹⁴In	49	65	113.904914(3)	71.9(1) s	β⁺ (99.5%)	¹¹⁴Cd	1+
¹¹⁴In	49	65	113.904914(3)	71.9(1) s	β⁻ (0.5%)	¹¹⁴Sn	1+
^114m1In	190.29(3) keV			49.51(1) d	IT (96.75%)	¹¹⁴In	5+
^114m1In	190.29(3) keV			49.51(1) d	β⁺ (3.25%)	¹¹⁴Cd	5+
^114m2In	501.94(3) keV			43.1(6) ms	IT (96.75%)	¹¹⁴In	(8−)
^114m2In	501.94(3) keV			43.1(6) ms	β⁺ (3.25%)	¹¹⁴Cd	(8−)
^114m3In	641.72(3) keV			4.3(4) µs			(7+)
¹¹⁵In^{[n 6]}^{[n 7]}	49	66	114.903878(5)	4.41(25)×10¹⁴ a	β⁻	¹¹⁵Sn	9/2+	0.9571(5)
^115mIn	336.244(17) keV			4.486(4) h	IT (95%)	¹¹⁵In	1/2−
^115mIn	336.244(17) keV			4.486(4) h	β⁻ (5%)	¹¹⁵Sn	1/2−
¹¹⁶In	49	67	115.905260(5)	14.10(3) s	β⁻	¹¹⁶Sn	1+
¹¹⁶In	49	67	115.905260(5)	14.10(3) s	EC	¹¹⁶Cd	1+
^116m1In	127.267(6) keV			54.29(17) min			5+
^116m2In	289.660(6) keV			2.18(4) s			8-
¹¹⁷In	49	68	116.904514(6)	43.2(3) min	β⁻	¹¹⁷Sn	9/2+
^117mIn	315.302(12) keV			116.2(3) min	β⁻ (52.91%)	¹¹⁷Sn	1/2−
^117mIn	315.302(12) keV			116.2(3) min	IT (47.09%)	¹¹⁷In	1/2−
¹¹⁸In	49	69	117.906354(9)	5.0(5) s	β⁻	¹¹⁸Sn	1+
^118m1In	100(50)# keV			4.364(7) min	β⁻	¹¹⁸Sn	5+
^118m2In	240(50)# keV			8.5(3) s			8-
¹¹⁹In	49	70	118.905845(8)	2.4(1) min	β⁻	¹¹⁹Sn	9/2+
^119m1In	311.37(3) keV			18.0(3) min	β⁻ (94.4%)	¹¹⁹Sn	1/2−
^119m1In	311.37(3) keV			18.0(3) min	IT (5.6%)	¹¹⁹In	1/2−
^119m2In	654.27(7) keV			130(15) ns			1/2+,3/2+
¹²⁰In	49	71	119.90796(4)	3.08(8) s	β⁻	¹²⁰Sn	1+
^120m1In	50(60)# keV			46.2(8) s			5+
^120m2In	300(200)# keV			47.3(5) s	β⁻	¹²⁰Sn	8(−)
¹²¹In	49	72	120.907846(29)	23.1(6) s	β⁻	¹²¹Sn	9/2+
^121mIn	312.98(8) keV			3.88(10) min	β⁻ (98.8%)	¹²¹Sn	1/2−
^121mIn	312.98(8) keV			3.88(10) min	IT (1.2%)	¹²¹In	1/2−
¹²²In	49	73	121.91028(5)	1.5(3) s	β⁻	¹²²Sn	1+
^122m1In	40(60)# keV			10.3(6) s			5+
^122m2In	290(140) keV			10.8(4) s	β⁻	¹²²Sn	8-
¹²³In	49	74	122.910438(26)	6.17(5) s	β⁻	^123mSn	(9/2)+
^123mIn	327.21(4) keV			47.4(4) s	β⁻	^123mSn	(1/2)−
¹²⁴In	49	75	123.91318(5)	3.11(10) s	β⁻	¹²⁴Sn	3+
^124mIn	-20(70) keV			3.7(2) s	β⁻	¹²⁴Sn	(8)(−#)
^124mIn	-20(70) keV			3.7(2) s	IT	¹²⁴In	(8)(−#)
¹²⁵In	49	76	124.91360(3)	2.36(4) s	β⁻	^125mSn	9/2+
^125mIn	360.12(9) keV			12.2(2) s	β⁻	¹²⁵Sn	1/2(−)
¹²⁶In	49	77	125.91646(4)	1.53(1) s	β⁻	¹²⁶Sn	3(+#)
^126mIn	100(60) keV			1.64(5) s	β⁻	¹²⁶Sn	8(−#)
¹²⁷In	49	78	126.91735(4)	1.09(1) s	β⁻ (99.97%)	^127mSn	9/2(+)
¹²⁷In	49	78	126.91735(4)	1.09(1) s	β⁻, n (.03%)	¹²⁶Sn	9/2(+)
^127mIn	460(70) keV			3.67(4) s	β⁻ (99.31%)	^127mSn	(1/2−)
^127mIn	460(70) keV			3.67(4) s	β⁻, n (.69%)	¹²⁶Sn	(1/2−)
¹²⁸In	49	79	127.92017(5)	0.84(6) s	β⁻ (99.96%)	¹²⁸Sn	(3)+
¹²⁸In	49	79	127.92017(5)	0.84(6) s	β⁻, n (.038%)	¹²⁷Sn	(3)+
^128m1In	247.87(10) keV			10(7) ms			(1)−
^128m2In	320(60) keV			720(100) ms	β⁻	¹²⁸Sn	(8−)
¹²⁹In	49	80	128.92170(5)	611(4) ms	β⁻ (99.75%)	¹²⁹Sn	9/2+#
¹²⁹In	49	80	128.92170(5)	611(4) ms	β⁻, n (.25%)	¹²⁸Sn	9/2+#
^129m1In	380(70) keV			1.23(3) s	β⁻ (97.2%)	¹²⁹Sn	(1/2−)#
					β⁻, n (2.5%)	¹²⁸Sn
					IT (.3%)	¹²⁹In
^129m2In	1688.0(5) keV			8.5(5) µs			17/2−
¹³⁰In	49	81	129.92497(4)	0.29(2) s	β⁻ (98.35%)	¹³⁰Sn	1(−)
¹³⁰In	49	81	129.92497(4)	0.29(2) s	β⁻, n (1.65%)	¹²⁹Sn	1(−)
^130m1In	50(50) keV			538(5) ms			10-#
^130m2In	400(60) keV			0.54(1) s			(5+)
¹³¹In	49	82	130.92685(3)	0.28(3) s	β⁻ (97.8%)	¹³¹Sn	(9/2+)
¹³¹In	49	82	130.92685(3)	0.28(3) s	β⁻, n (2.19%)	¹³⁰Sn	(9/2+)
^131m1In	363(37) keV			0.35(5) s			(1/2−)
^131m2In	4.10(7) MeV			320(60) ms			(19/2+ to 23/2+)
¹³²In	49	83	131.93299(7)	206(4) ms	β⁻ (94.8%)	¹³²Sn	(7−)
¹³²In	49	83	131.93299(7)	206(4) ms	β⁻, n (5.2%)	¹³¹Sn	(7−)
¹³³In	49	84	132.93781(32)#	165(3) ms	β⁻, n (85%)	¹³²Sn	(9/2+)
¹³³In	49	84	132.93781(32)#	165(3) ms	β⁻ (15%)	¹³³Sn	(9/2+)
^133mIn	330(40)# keV			180# ms	IT	¹³³In	(1/2−)
¹³⁴In	49	85	133.94415(43)#	140(4) ms	β⁻ (79%)	¹³⁴Sn
					β⁻, n (17%)	¹³³Sn
					β⁻, 2n (4%)	¹³²Sn
¹³⁵In	49	86	134.94933(54)#	92(10) ms	β⁻	¹³⁵Sn	9/2+#
¹³⁶In	49	87		85 ms	β⁻	¹³⁶Sn
¹³⁷In	49	88		65 ms	β⁻	¹³⁷Sn

^ Bold for isotopes with half-lives longer than the age of the universe (nearly stable)
^ Abbreviations:
EC: Electron capture
IT: Isomeric transition
^ Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
^ Used in medical applications
^ Theoretically capable of spontaneous fission
^ Fission product
^ Primordial radionuclide

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

^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
^ "Standard Atomic Weights: Indium". CIAAW. 2011.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^ "Octreoscan review". Medscape. {{cite web}}: Unknown parameter |registration= ignored (|url-access= suggested) (help)
^ "Universal Nuclide Chart". nucleonica. {{cite web}}: Unknown parameter |registration= ignored (|url-access= suggested) (help)

Isotope masses from:
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23. {{cite journal}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
Isotopic compositions and standard atomic masses from:
- J. R. de Laeter; J. K. Böhlke; P. De Bièvre; H. Hidaka; H. S. Peiser; K. J. R. Rosman; P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051. {{cite journal}}: Unknown parameter |laysummary= ignored (help)
Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23. {{cite journal}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
- National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005. {{cite web}}: Check date values in: |accessdate= (help)
- N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide (ed.). CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0-8493-0485-9. {{cite book}}: Unknown parameter |nopp= ignored (|no-pp= suggested) (help)

[5] Bold for isotopes with half-lives longer than the age of the universe (nearly stable)

[7] Abbreviations:
EC: Electron capture
IT: Isomeric transition

[8] Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)

[9] Used in medical applications

[10] Theoretically capable of spontaneous fission

[11] Fission product

[12] Primordial radionuclide

[NUBASE2020-1] Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

[2] "Standard Atomic Weights: Indium". CIAAW. 2011.

[CIAAW2021-3] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[4] "Octreoscan review". Medscape. {{cite web}}: Unknown parameter |registration= ignored (|url-access= suggested) (help)

[6] "Universal Nuclide Chart". nucleonica. {{cite web}}: Unknown parameter |registration= ignored (|url-access= suggested) (help)

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