open access

Vol 24, No 4 (2019)
Original research articles
Published online: 2019-07-01
Submitted: 2018-02-28
Get Citation

Radiation dose verification of an X-ray based blood irradiator using EBT3 radiochromic films calibrated using Gamma Knife machine

Khaled Soliman, Marouf Adili, Abdullah Alrushoud
DOI: 10.1016/j.rpor.2019.05.006
·
Rep Pract Oncol Radiother 2019;24(4):369-374.

open access

Vol 24, No 4 (2019)
Original research articles
Published online: 2019-07-01
Submitted: 2018-02-28

Abstract

Aim

Blood irradiators (BI) initial acceptance testing and routine annual dosimetry checks require radiation dose measurements in order to comply with regulatory requirements.

Background

Traditionally thermo-luminescence dosimeters (TLD) have been used to measure the dose. The EBT3 film is reported to be a better dosimeter for low energy X-rays than its predecessors EBT2 and EBT. To the best of our knowledge, the use of EBT3 films to perform dosimetry on X-ray based BI has not been reported yet.

Materials and methods

We performed routine radiation dosimetry checks using EBT3 films on a new X-ray based BI and compared the results with TLD dosimetry. Calibration films were irradiated with radiation beam from a Co-60 Gamma Knife (GK) radiosurgery machine and, alternatively, using an Ir-192 high dose rate (HDR) brachytherapy device. The films were calibrated to cover a wide dose range from 1 to 40Gy. Such a wide dose range has not been reported yet in BI film dosimetry.

Results

We obtained a relative difference of about 6.6% between doses measured using TLD and those measured using EBT3 films. Both irradiation methods using GK or HDR were found to be adequate for the calibration of the EBT3 Gafchromic films.

Conclusions

We recommend the use of EBT3 films in routine X-ray based BI dosimetry checks. The presented method takes advantage of available radiotherapy equipment that can be efficiently used for EBT3 films calibration. The method is fast, reproducible and saves valuable medical physicist's time.

Abstract

Aim

Blood irradiators (BI) initial acceptance testing and routine annual dosimetry checks require radiation dose measurements in order to comply with regulatory requirements.

Background

Traditionally thermo-luminescence dosimeters (TLD) have been used to measure the dose. The EBT3 film is reported to be a better dosimeter for low energy X-rays than its predecessors EBT2 and EBT. To the best of our knowledge, the use of EBT3 films to perform dosimetry on X-ray based BI has not been reported yet.

Materials and methods

We performed routine radiation dosimetry checks using EBT3 films on a new X-ray based BI and compared the results with TLD dosimetry. Calibration films were irradiated with radiation beam from a Co-60 Gamma Knife (GK) radiosurgery machine and, alternatively, using an Ir-192 high dose rate (HDR) brachytherapy device. The films were calibrated to cover a wide dose range from 1 to 40Gy. Such a wide dose range has not been reported yet in BI film dosimetry.

Results

We obtained a relative difference of about 6.6% between doses measured using TLD and those measured using EBT3 films. Both irradiation methods using GK or HDR were found to be adequate for the calibration of the EBT3 Gafchromic films.

Conclusions

We recommend the use of EBT3 films in routine X-ray based BI dosimetry checks. The presented method takes advantage of available radiotherapy equipment that can be efficiently used for EBT3 films calibration. The method is fast, reproducible and saves valuable medical physicist's time.

Get Citation

Keywords

Gafchromic EBT3; Blood irradiation; X-ray based irradiators; Gamma Knife; Quality assurance

About this article
Title

Radiation dose verification of an X-ray based blood irradiator using EBT3 radiochromic films calibrated using Gamma Knife machine

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 24, No 4 (2019)

Pages

369-374

Published online

2019-07-01

DOI

10.1016/j.rpor.2019.05.006

Bibliographic record

Rep Pract Oncol Radiother 2019;24(4):369-374.

Keywords

Gafchromic EBT3
Blood irradiation
X-ray based irradiators
Gamma Knife
Quality assurance

Authors

Khaled Soliman
Marouf Adili
Abdullah Alrushoud

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