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Volume 13, Number 2, 2008

In-air calibration of new high dose rate 60Co brachytherapy sources: results of measurements on a GZP6 brachytherapy afterloading unit

Asghar MESBAHI, Alireza NASERI

Summary:

BACKGROUND: The air kerma rate of brachytherapy sources should be determined accurately by the manufacturer and medical physicists before clinical use.
AIM: In the current study the air kerma rate of three new 60Co high dose rate (HDR) brachytherapy sources was obtained by in-air measurements and a Farmer type ionization chamber.
MATERIALS/METHODS: Three 60Co sources of a brachytherapy afterloading unit, GZP6, were calibrated in free air using a Farmer type chamber which was calibrated in terms of air kerma in an external teletherapy 60Co beam. Several correction factors including scatter correction and non-uniformity correction factors were derived and used for in-air calibrations.
RESULTS: The measured air kerma rates for all sources were in good agreement (less than 2.5%) with manufacturer-provided data, and the reliability of the air kerma rates of sources was validated for clinical application.
CONCLUSION: In-air calibration of 60Co HDR sources can be performed using a Farmer type ionization chamber with acceptable accuracy. However, accurate distance measurement and reproducible measurement setup are required.

Signature: Rep Pract Oncol Radiother, 2008; 13(2) : 69-73

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Indexed in: EMBASE®, the Excerpta Medica database, the Elsevier BIOBASE (Current Awareness in Biological Sciences) and in the Index Copernicus.

http://www.sciencedirect.com/science/journal/15071367/19/2