open access

Vol 13, No 2 (2008)
Untitled
Published online: 2008-03-01
Submitted: 2007-07-09
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In-air calibration of new high dose rate Co brachytherapy sources: results of measurements on a GZP6 brachytherapy afterloading unit

Asghar MESBAHI, Alireza NASERI
DOI: 10.1016/S1507-1367(10)60084-3
·
Rep Pract Oncol Radiother 2008;13(2):69-73.

open access

Vol 13, No 2 (2008)
Untitled
Published online: 2008-03-01
Submitted: 2007-07-09

Abstract

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.

Abstract

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.

Get Citation
About this article
Title

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

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 13, No 2 (2008)

Pages

69-73

Published online

2008-03-01

DOI

10.1016/S1507-1367(10)60084-3

Bibliographic record

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

Authors

Asghar MESBAHI
Alireza NASERI

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