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Teletherapy sources with imported and indigenous Co activity.

Jain Reji George¹, Raksha Kushwah, K V S Sastry

¹Board of Radiation and Isotope Technology, Department of Atomic Energy, BRIT/BARC Vashi Complex, Sector-20, Vashi, Navi Mumbai-400705, India.

Journal of Medical Physics

|January 26, 2010

Summary

This study explored mixing imported and indigenous cobalt-60 pellets for teletherapy sources. Combining sources with different specific activities is feasible, potentially reducing reliance on imported materials.

Keywords:

60Co pellets Content activity and specific activity radiation output (RMM)teletherapy

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Area of Science:

Nuclear Engineering
Medical Physics
Materials Science

Background:

The Board of Radiation and Isotope Technology supplies radioactive sources for various applications.
High specific activity cobalt-60 for teletherapy is typically imported.
There is a need for indigenous manufacturing of high specific activity cobalt-60 sources.

Purpose of the Study:

To assess the feasibility of fabricating teletherapy source capsules by mixing imported and indigenous cobalt-60 pellets.
To evaluate the radiation output from mixed-activity capsules.
To determine optimal capsule designs and activity compensation for self-absorption losses.

Main Methods:

Simulated radiation output from teletherapy source capsules using various combinations of imported (>300 Ci/g) and indigenous (140 Ci/g) cobalt-60 pellets.
Accounted for self-absorption losses in radiation output calculations.
Estimated optimal capsule lengths and additional activity needed to achieve a target output (200 RMM).

Main Results:

Radiation output was evaluated for different specific activity combinations.
Self-absorption losses were quantified and factored into estimations.
Optimized capsule lengths and compensating activity were estimated for various pellet specific activities.
Fabricated sources aligned well with estimations.

Conclusions:

Mixing imported and indigenous cobalt-60 pellets for teletherapy source fabrication is a viable approach.
This method can potentially reduce dependence on imported high specific activity cobalt-60.
Further fabrication and testing of mixed-activity source capsules are recommended.