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Medical · TheranosticNovel
Co
27
55
Cobalt-55
A positron-emitting (β⁺) theranostic isotope and calcium analogue. Its 17.5-hour half-life supports PET perfusion imaging and the study of longer biological processes.
t½ 17.5 hoursPositron Emission (β⁺)
27 e⁻4 shells
Atomic Structure
27
Protons
28
Neutrons
K2 e⁻
L8 e⁻
M15 e⁻
N2 e⁻
Applications
- PET perfusion imaging
- Calcium-analog tracing
- Theranostic pairing
- Myocardial viability assessment
Production
Reaction
⁵⁸Ni(p,α)⁵⁵Co
Target
Enriched ⁵⁸Ni
Source
30 MeV Cyclotron
16 MeV CyclotronLimited
30 MeV CyclotronYes
70 MeV CyclotronYes
Nuclear ReactorNo
⁵⁸Ni(p,α)⁵⁵Co or ⁵⁴Fe(d,n)⁵⁵Co — threshold ~5 MeV, optimal ~20 MeV.