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Performance evaluation of EBT3, EBT-XD, and OrthoChromic OC-1 films for reference dosimetry in Ultra-High dose rate
Cathyanne Schott1, Imane Said-Mansour1, Pauline Maury1
1INSERM U1030, Gustave Roussy, Université Paris-Saclay, Villejuif, France; Department of Radiation Oncology, Gustave Roussy Cancer Campus, Villejuif, France.
Purpose:
This study evaluates EBT3, EBT-XD (Ashland) and OC-1 (OrthoChrome) films for reference dosimetry in electron beams, focusing on their use in ultra-high dose rate (UHDR) conditions.
Methods:
Responses of the three film types were compared and the influence of calibration methodology and background correction method on accuracy were evaluated by irradiating the films at doses between 2.5-30 Gy in a 12 MeV electron beam with a conventional linac (CONV, 600 monitor units/mins). Measured doses were compared to a calibrated Advanced Markus ionization chamber (IC). Finally, films were irradiated alongside a flashDiamond (fD) at UHDR (mean dose rate 150 Gy/s) under various beam parameters (Pulse Width (PW): 0.5-4 µs, Pulse Repetition Frequency (PRF): 10-250 Hz) using the FLASHKNiFE system (THERYQ, Peynier, France). Films measurements were compared to those obtained with the fD.
Results:
EBT3 films showed the least influence from their intrinsic properties and the scanning process. The background correction method did not improve measurement accuracy. A calibration curve generated on a different day from the irradiations provided accuracy comparable to simultaneous calibration and irradiation. Relative deviation with IC below 2.5 % at CONV dose rate was observed for the 3 film types. On average, doses measured with the 3 types of films and fD at UHDR were consistent within 5%, and showed independent responses to PW, PRF, and dose per pulse.
Conclusion:
EBT3, EBT-XD and OC-1 films have demonstrated suitability for absolute dosimetry of electron beams in UHDR conditions, with EBT3 and EBT-XD films emerging as the optimal choice.
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