Indium-111m

Properties and data of the isotope ^111mIn.

Contents

See also: List of individual Indium isotopes (and general data sources).

General data

Name of the isotope:Indium-111m; In-111mSymbol:^111mIn or 111m49InMass number A:111 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:62Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.265306122449 (= neutron-proton ratio)Neutron excess (N-Z):13Excitation energy:536.99(7) keVIsotopic mass:110.905107(4) u (atomic weight of Indium-111m)Nuclide mass:110.8782281 u (calculated nuclear mass without electrons)Mass excess:-88.39226 MeVMass defect:1.01554436 u (per nucleus)Nuclear binding energy:945.97347807 MeV (per nucleus)
8.52228359 MeV (average binding energy per nucleon)Half-life:7.7(2) minDecay constant λ:0.0015003185726406 s^-1Specific activity α:8.146720988496 × 10⁺¹⁸ Bq g^-1
220181648.33775 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-

Radioactive Decay

Half-life T_½ = 7.7(2) min (minutes) respectively 4.62 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹¹¹In	100 %

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹¹¹In		2.8047(4) d	9/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 62) and isobaric (same nucleon number A = 111) with Indium-111m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 62	Isobar A = 111
35	⁹⁷Br
36	⁹⁸Kr
37	⁹⁹Rb
38	¹⁰⁰Sr
39	¹⁰¹Y	¹¹¹Y
40	¹⁰²Zr	¹¹¹Zr
41	¹⁰³Nb	¹¹¹Nb
42	¹⁰⁴Mo	¹¹¹Mo
43	¹⁰⁵Tc	¹¹¹Tc
44	¹⁰⁶Ru	¹¹¹Ru
45	¹⁰⁷Rh	¹¹¹Rh
46	¹⁰⁸Pd	¹¹¹Pd
47	¹⁰⁹Ag	¹¹¹Ag
48	¹¹⁰Cd	¹¹¹Cd
49	¹¹¹In	¹¹¹In
50	¹¹²Sn	¹¹¹Sn
51	¹¹³Sb	¹¹¹Sb
52	¹¹⁴Te	¹¹¹Te
53	¹¹⁵I	¹¹¹I
54	¹¹⁶Xe	¹¹¹Xe
55	¹¹⁷Cs
56	¹¹⁸Ba
57	¹¹⁹La
58	¹²⁰Ce
59	¹²¹Pr