Optimisation of the MAGAT gel dosimeter compositions

Background: an effective polymer gel dosimeter can be fabricated by varying the composition of its chemical components

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Materials and Methods: the MAGAT gel dosimeter formulations that used different compositions of Methacrylic acid [MAA] and gelatin were extensively investigated in the present study according to the R2-dose response and R2-dose sensitivity. The irradiation of MAGAT gel was performed by 6-MV photon beam at a dose range 1 to 10 Gy and was imaged by 1.5T Magnetic Resonance Imaging [MRI]. The dose response of MAGAT gel dosimeter was obtained from spin-spin relaxation rate [R2] of MRI signal

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Results: the MAGAT gel dosimeter composed of 5% gelatin and 6% MAA gave the highest sensitivity [1.1180 s[-1]Gy[-1]]

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Conclusion: understanding the effects of the compositional changes will help to clarify the mechanisms involved in the dose response of the MAGAT gel dosimeter