Quick Answer:The Sealed Radioactive Source, Cobalt contains 5 μCi (185 kBq) of cobalt-60 behind an aluminium disc that shields the beta particles, so only gamma radiation is emitted. It is colour-coded green and has a 5.26-year half-life.
Last updated: 18 October 2026
Key Features
Aluminium disc blocks beta emission, leaving a gamma-only source.
Active material enclosed in metal foil in a cylindrical mount with a 4 mm stem, protected by a wire gauze cap.
Mount engraved with the nature and strength of the source, and colour-coded green.
Comes in a small lead castle within a labelled MDF box, together with a data sheet.
Technical Specifications
Specification
Value
Isotope
Cobalt-60
Activity
5 μCi (185 kBq)
Emission
γ only (β shielded by aluminium disc)
Half-life, years
5.26
Colour code
Green
Mount
Cylindrical, 4 mm diameter stem
Storage
Lead castle in labelled MDF box, 100 x 75 x 65 mm high
Documentation
Data sheet
How It Is Used
With the beta particles filtered out, the source gives gamma radiation alone, which suits GM tube counting work where only gamma emission is wanted. After use it goes back into its lead castle and storage box.
Frequently Asked Questions
Why does the Sealed Radioactive Source, Cobalt emit only gamma rays?
The cobalt-60 is covered by an aluminium disc that shields the beta particles, so only gamma radiation is emitted.
Institutions and distributors in Latvia, Grenada, Bahrain, Estonia, Malta and Cameroon can request an export quotation for the Sealed Radioactive Source, Cobalt.
For a quotation on the Sealed Radioactive Source, Cobalt, contact JLab India on +91-8569909696.
