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Verification of dose rate and energy dependence of MAGICA polymer gel dosimeter with electron beams
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K. Adinehvand   , M.H. Zahmatkesh , M.R Aghamiri , Sh. Akhlaghpour , S. Bagheri |
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Abstract: (15287 Views) |
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Background: The purpose of this study was to
evaluate the dependency of MAGICA polymer gel
dosimeter response (R2) on different electron
energies as well as on different mean dose rate for a
standard clinically used linear accelerator. Materials
and Methods: The sensitivity of the dosimeter was
represented by the slope of calibration curve in the
linear region measured for each modality. A calibration
curve (in the linear region) based on 12 dosimeters
(11 irradiated and one blank) was obtained for 6 MeV
electron beam. Dosimeter energy dependence was
studied for electron energies of 4,6,12 and 18 MeV.
Dose rate dependence was studied in 10 MeV electron
beam with the use of dose rates 80,160,240,320,400
and 480 cGymin-1. Evaluations of dosimeters were
performed on Siemens Symphony, Germany, 1.5T
Scanner in the head coil. A multiecho sequence with
32 equidistant echoes was used for the evaluation of
irradiated polymer gel dosimeters. The parameters of
the sequence were as follows: TR 3000ms, TE 20ms,
Slice Thickness 4mm and FOV 256mm. Results:
Polymer gel dosimeter response R2 was increased
with increasing electron energy. No trend in polymergel
dosimeter R2 dependence was found on mean
dose rate for electron beams. Conclusion: In MAGICA
polymer gel, the sensitivity is dependant on electron
energy increase, but no dependence was observed on
response to dose rate. The presence of antioxidant
and oxygen scavengers in the MAGICA polymer gel is
believed to cause different results. Iran. J. Radiat. Res.,
2008 6 (1): 31-36 |
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| Keywords: Polymer gels, MAGICA gel, magnetic resonance imaging (MRI), agarose. |
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Full-Text [PDF 315 kb]
(3071 Downloads)
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Type of Study: Original Research |
Subject:
Radiation Biology
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