Isotopes of indium

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Indium (In) 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 441 trillion 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).[1] Indium-111 is also used in indium white blood cell scans which use nuclear medical techniques to search for hidden infections.

Standard atomic mass: 114.818(3) u


isotopic mass (u)
half-life[n 1]decay
mode(s)[2][n 2]
isotope(s)[n 3]
(mole fraction)
range of natural
(mole fraction)
excitation energy
97In494896.94954(64)#5# ms9/2+#
98In494997.94214(21)#45(23) ms
[32(+32-11) ms]
98mIn0(500)# keV1.7(8) s
[1.2(+12-4) s]
99In495098.93422(43)#3.1(8) s
[3.0(+8-7) s]
99mIn400(150)# keV1# s1/2-#
100In495199.93111(27)5.9(2) sβ+ (96.1%)100Cd(6,7)+
β+, p (3.9%)99Ag
101In4952100.92634(32)#15.1(3) sβ+100Cd9/2+#
β+, p100Ag
101mIn550(100)# keV10# s1/2-#
102In4953101.92409(12)23.3(1) sβ+ (99.99%)102Cd(6+)
β+, p (.00929%)101Ag
103In4954102.919914(27)60(1) sβ+103Cd9/2+#
103mIn631.7(1) keV34(2) s(1/2-)#
104In4955103.91830(9)1.80(3) minβ+104Cd5,6(+)
104mIn93.48(10) keV15.7(5) sIT (80%)104In(3+)
β+ (20%)104Cd
105In4956104.914674(19)5.07(7) minβ+105Cd9/2+
105mIn674.1(3) keV48(6) sIT105In(1/2)-
106In4957105.913465(13)6.2(1) minβ+106Cd7+
106mIn28.6(3) keV5.2(1) minβ+106Cd(3+)
107In4958106.910295(12)32.4(3) minβ+107Cd9/2+
107mIn678.5(3) keV50.4(6) sIT107In1/2-
108In4959107.909698(10)58.0(12) minβ+108Cd7+
108mIn29.75(5) keV39.6(7) minβ+108Cd2+
109In4960108.907151(6)4.2(1) hβ+109Cd9/2+
109m1In650.1(3) keV1.34(7) minIT109In1/2-
109m2In2101.8(2) keV209(6) ms(19/2+)
110In4961109.907165(13)4.9(1) hβ+110Cd7+
110mIn62.1(5) keV69.1(5) minβ+110Cd2+
111In[n 4]4962110.905103(5)2.8047(5) dEC111Cd9/2+
111mIn536.95(6) keV7.7(2) minIT111In1/2-
112In4963111.905532(6)14.97(10) minβ+ (56%)112Cd1+
β- (44%)112Sn
112m1In156.59(5) keV20.56(6) minβ+112Cd4+
112m2In350.76(9) keV690(50) ns7+
112m3In613.69(14) keV2.81(3) µs8-
113In4964112.904058(3)Stable[n 5]9/2+0.0429(5)
113mIn391.699(3) keV1.6579(4) hIT113In1/2-
114In4965113.904914(3)71.9(1) sβ+ (99.5%)114Cd1+
β- (0.5%)114Sn
114m1In190.29(3) keV49.51(1) dIT (96.75%)114In5+
β+ (3.25%)114Cd
114m2In501.94(3) keV43.1(6) msIT (96.75%)114In(8-)
β+ (3.25%)114Cd
114m3In641.72(3) keV4.3(4) µs(7+)
115In[n 6][n 7]4966114.903878(5)4.41(25)×1014 aβ-115Sn9/2+0.9571(5)
115mIn336.244(17) keV4.486(4) hIT (95%)115In1/2-
β- (5%)115Sn
116In4967115.905260(5)14.10(3) sβ-116Sn1+
116m1In127.267(6) keV54.29(17) min5+
116m2In289.660(6) keV2.18(4) s8-
117In4968116.904514(6)43.2(3) minβ-117Sn9/2+
117mIn315.302(12) keV116.2(3) minβ- (52.91%)117Sn1/2-
IT (47.09%)117In
118In4969117.906354(9)5.0(5) sβ-118Sn1+
118m1In100(50)# keV4.364(7) minβ-118Sn5+
118m2In240(50)# keV8.5(3) s8-
119In4970118.905845(8)2.4(1) minβ-119Sn9/2+
119m1In311.37(3) keV18.0(3) minβ- (94.4%)119Sn1/2-
IT (5.6%)119In
119m2In654.27(7) keV130(15) ns1/2+,3/2+
120In4971119.90796(4)3.08(8) sβ-120Sn1+
120m1In50(60)# keV46.2(8) s5+
120m2In300(200)# keV47.3(5) sβ-120Sn8(-)
121In4972120.907846(29)23.1(6) sβ-121Sn9/2+
121mIn312.98(8) keV3.88(10) minβ- (98.8%)121Sn1/2-
IT (1.2%)121In
122In4973121.91028(5)1.5(3) sβ-122Sn1+
122m1In40(60)# keV10.3(6) s5+
122m2In290(140) keV10.8(4) sβ-122Sn8-
123In4974122.910438(26)6.17(5) sβ-123mSn(9/2)+
123mIn327.21(4) keV47.4(4) sβ-123mSn(1/2)-
124In4975123.91318(5)3.11(10) sβ-124Sn3+
124mIn-20(70) keV3.7(2) sβ-124Sn(8)(-#)
125In4976124.91360(3)2.36(4) sβ-125mSn9/2+
125mIn360.12(9) keV12.2(2) sβ-125Sn1/2(-)
126In4977125.91646(4)1.53(1) sβ-126Sn3(+#)
126mIn100(60) keV1.64(5) sβ-126Sn8(-#)
127In4978126.91735(4)1.09(1) sβ- (99.97%)127mSn9/2(+)
β-, n (.03%)126Sn
127mIn460(70) keV3.67(4) sβ- (99.31%)127mSn(1/2-)
β-, n (.69%)126Sn
128In4979127.92017(5)0.84(6) sβ- (99.96%)128Sn(3)+
β-, n (.038%)127Sn
128m1In247.87(10) keV10(7) ms(1)-
128m2In320(60) keV720(100) msβ-128Sn(8-)
129In4980128.92170(5)611(4) msβ- (99.75%)129Sn9/2+#
β-, n (.25%)128Sn
129m1In380(70) keV1.23(3) sβ- (97.2%)129Sn(1/2-)#
β-, n (2.5%)128Sn
IT (.3%)129In
129m2In1688.0(5) keV8.5(5) µs17/2-
130In4981129.92497(4)0.29(2) sβ- (98.35%)130Sn1(-)
β-, n (1.65%)129Sn
130m1In50(50) keV538(5) ms10-#
130m2In400(60) keV0.54(1) s(5+)
131In4982130.92685(3)0.28(3) sβ- (97.8%)131Sn(9/2+)
β-, n (2.19%)130Sn
131m1In363(37) keV0.35(5) s(1/2-)
131m2In4.10(7) MeV320(60) ms(19/2+ to 23/2+)
132In4983131.93299(7)206(4) msβ- (94.8%)132Sn(7-)
β-, n (5.2%)131Sn
133In4984132.93781(32)#165(3) msβ-, n (85%)132Sn(9/2+)
β- (15%)133Sn
133mIn330(40)# keV180# msIT133In(1/2-)
134In4985133.94415(43)#140(4) msβ- (79%)134Sn
β-, n (17%)133Sn
β-, 2n (4%)132Sn
135In4986134.94933(54)#92(10) ms9/2+#
  1. ^ Bold for isotopes with half-lives longer than the age of the universe (nearly stable)
  2. ^ Abbreviations:
    EC: Electron capture
    IT: Isomeric transition
  3. ^ Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
  4. ^ Used in medical applications
  5. ^ Theoretically capable of spontaneous fission
  6. ^ Fission product
  7. ^ Primordial radionuclide



Isotopes of cadmiumIsotopes of indiumIsotopes of tin
Table of nuclides