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, much longer than the currently accepted age of the Universe.

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.

Several proton-rich isotopes of indium (including indium-99) have been used to measure the mass of the doubly-magic isotope tin-100.^[5]^[6]

List of isotopes

Nuclide ^{[n 1]}	Z	N	Isotopic mass (Da) ^{[n 2]}^{[n 3]}	Half-life ^{[n 4]}	Decay mode ^{[n 5]}	Daughter isotope ^{[n 6]}^{[n 7]}	Spin and parity ^{[n 8]}^{[n 4]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Excitation energy^{[n 4]}			Half-life ^{[n 4]}	Decay mode ^{[n 5]}	Daughter isotope ^{[n 6]}^{[n 7]}	Spin and parity ^{[n 8]}^{[n 4]}	Normal proportion	Range of variation
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⁺	¹⁰¹Cd	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 9]}	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^{[n 10]}	49	64	112.904058(3)	Stable			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⁺ (0.5%)	¹¹⁴Cd	1+
¹¹⁴In	49	65	113.904914(3)	71.9(1) s	β⁻ (99.5%)	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 10]}^{[n 11]}	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⁻ (99.98%)^[7]	¹¹⁶Sn	1+
¹¹⁶In	49	67	115.905260(5)	14.10(3) s	EC (0.02%)^[7]	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
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References

Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Isotopic compositions and standard atomic masses from:
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.
"News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 October 2005.
Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

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