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Medical · PET / SPECT
In
49
111

Indium-111

A gamma-emitting SPECT workhorse with a 2.8-day half-life, used for white blood cell labeling, peptide receptor imaging (Octreoscan), and antibody pharmacokinetics.

t½ 2.8 daysElectron Capture (γ)
49 e⁻5 shells

Atomic Structure

49
Protons
62
Neutrons
K2 e⁻
L8 e⁻
M18 e⁻
N18 e⁻
O3 e⁻

Applications

  • WBC labeling (infection imaging)
  • Octreoscan (neuroendocrine tumors)
  • Antibody pharmacokinetics
  • Peptide receptor SPECT

Production

Reaction
¹¹²Cd(p,2n)¹¹¹In
Target
Enriched ¹¹²Cd
Source
30 MeV Cyclotron
16 MeV CyclotronLimited
30 MeV CyclotronYes
70 MeV CyclotronYes
Nuclear ReactorYes

Threshold ~10 MeV, optimal 20–25 MeV.