open access

Vol 16, No 1 (2011)
Published online: 2011-01-01
Submitted: 2010-08-19
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Evaluation of Gafchromic EBT2 film for the measurement of anisotropy function for high-dose-rate Ir brachytherapy source with respect to thermoluminescent dosimetry

Satish C. Uniyal, Umesh C. Naithani, Sunil D. Sharma
DOI: 10.1016/j.rpor.2010.11.003
·
Rep Pract Oncol Radiother 2011;16(1):14-20.

open access

Vol 16, No 1 (2011)
Published online: 2011-01-01
Submitted: 2010-08-19

Abstract

Aim

The aim of this work was to assess the suitability of the use of a Gafchromic EBT2 film for the measurement of anisotropy function for microSelectron HDR 192Ir (classic) source with a comparative dosimetry method using a Gafchromic EBT2 film and thermoluminescence dosimeters (TLDs).

Background

Sealed linear radiation sources are commonly used for high dose rate (HDR) brachytherapy treatments. Due to self-absorption and oblique filtration of radiation in the source capsule material, an inherent anisotropy is present in the dose distribution around the source which can be described by a measurable two-dimensional anisotropy function, F(r, θ).

Materials and methods

Measurements were carried out in a specially designed and locally fabricated PMMA phantom with provisions to accommodate miniature LiF TLD rods and EBT2 film dosimeters at identical radial distances with respect to the 192Ir source.

Results

The data of anisotropy function generated by the use of the Gafchromic EBT2 film method are in agreement with their TLD measured values within 4%. The produced data are also consistent with their experimental and Monte Carlo calculated results for this source available in the literature.

Conclusion

Gafchromic EBT2 film was found to be a feasible dosimeter in determining anisotropy in the dose distribution of 192Ir source. It offers high resolution and is a viable alternative to TLD dosimetry at discrete points. The method described in this paper is useful for comparing the performances of detectors and can be applied for other brachytherapy sources as well.

Abstract

Aim

The aim of this work was to assess the suitability of the use of a Gafchromic EBT2 film for the measurement of anisotropy function for microSelectron HDR 192Ir (classic) source with a comparative dosimetry method using a Gafchromic EBT2 film and thermoluminescence dosimeters (TLDs).

Background

Sealed linear radiation sources are commonly used for high dose rate (HDR) brachytherapy treatments. Due to self-absorption and oblique filtration of radiation in the source capsule material, an inherent anisotropy is present in the dose distribution around the source which can be described by a measurable two-dimensional anisotropy function, F(r, θ).

Materials and methods

Measurements were carried out in a specially designed and locally fabricated PMMA phantom with provisions to accommodate miniature LiF TLD rods and EBT2 film dosimeters at identical radial distances with respect to the 192Ir source.

Results

The data of anisotropy function generated by the use of the Gafchromic EBT2 film method are in agreement with their TLD measured values within 4%. The produced data are also consistent with their experimental and Monte Carlo calculated results for this source available in the literature.

Conclusion

Gafchromic EBT2 film was found to be a feasible dosimeter in determining anisotropy in the dose distribution of 192Ir source. It offers high resolution and is a viable alternative to TLD dosimetry at discrete points. The method described in this paper is useful for comparing the performances of detectors and can be applied for other brachytherapy sources as well.

Get Citation

Keywords

Anisotropy function; TL dosimetry; Gafchromic EBT2 film; HDR [[ce:sup loc=" pre" ]]192Ir source

About this article
Title

Evaluation of Gafchromic EBT2 film for the measurement of anisotropy function for high-dose-rate Ir brachytherapy source with respect to thermoluminescent dosimetry

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 16, No 1 (2011)

Pages

14-20

Published online

2011-01-01

DOI

10.1016/j.rpor.2010.11.003

Bibliographic record

Rep Pract Oncol Radiother 2011;16(1):14-20.

Keywords

Anisotropy function
TL dosimetry
Gafchromic EBT2 film
HDR [[ce:sup loc="pre"]]192Ir source

Authors

Satish C. Uniyal
Umesh C. Naithani
Sunil D. Sharma

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