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Water equivalent radiological properties of Gafchromic external beam therapy and external beam therapy 2 film dosimeters

 Department of Physics, School of Advanced Science, VIT University, Vellore, Tamil Nadu, India

Correspondence Address:
K Srinivasan,
Department of Physics, School of Advanced Sciences, VIT University, Vellore, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jcrt.JCRT_965_16

Background: Water equivalent property of any clinical dosimeter is important. Water has the approximately similar radiation absorption and scattering properties to soft tissue. Film dosimeter plays a significant role in radiotherapy quality assurance and treatment plan verification. Aims: In this study, we are evaluating the water equivalent radiological properties of Gafchromic electronic benefit transfer (EBT) and EBT2 film dosimeters. Materials and Methods: Radiological properties such as number of electrons per gram (ne), electron density (ϼe), and effective atomic number (Zeff) are calculated using Mayneord formula. Mixture rule is used to calculate the mass absorption coefficient (μen/ϼ) and mass attenuation coefficient (μ/ϼ), and data are generated using Win-XCom over 10 KeV to 20 MeV. Electron stopping power data are generated with the help of ESTAR database over 10 KeV to 30 MeV. Those results are compared with water and deviations are found. Results: Our results suggest that Zeff, ne, and ϼe of EBT is showing deviations <8.83%, 4.39%, and 16.18% and for EBT2 is 4.26%, 2.82%, and 19.41% with respect to water. Deviation in μen/ϼ and μ/ϼ of EBT and EBT2 film is ≤5% and ≤6%, respectively, with respect to water >100 KeV. Electron stopping power properties are also close in agreements with water having deviations ≤5%. Conclusion: Presence of high atomic number element chlorine, potassium, and bromine may disturb the water equivalent properties in the lower energy range <100 KeV and similarly enhance the dose sensitivity because of the strong photoelectric absorption process.

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