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<p>The Energy dependence of the dose response is a primary characteristic of a radiation dosimeter. Although an ideal dosimeter should exhibit an independent energy response over the range of use, all types of dosimeters show some energy dependence. The current study aimed to evaluate this energy dependence of some gafchromic films in a photon field through Monte Carlo (MC) simulations using the MCNPX code. Five gafchromic films including EBT3, EBT4, HD-V2, MD-V3, and RTQA2 were considered and the energy dependence was evaluated for monochromatic and some polychromatic clinical photon beams. The results showed that all considered films show an energy dependent dose response. Specifically, the energy dependence was highly evident at photon energies below 60&#xa0;keV. Among the studied films, the EBT4 and MD-V3 films showed the least and most energy dependence, respectively. Changing from monochromatic nature of photon beam to a polychromatic clinical beam changed film energy dependence response at keV energy range. Although considered gafchromic films are characterized as dosimeters with energy-independent response, all studied films showed a degree of absorbed-dose energy dependence. This observed energy dependence may be of concern in absorbed dose measurements, especially at low photon energies.</p>

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Evaluation of the absorbed-dose response of EBT3, EBT4, HD-V2, MD-V3, and RTQA2 gafchromic films as a function of photon energy

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Mohammad Khosravani,
  • Hamid Reza Baghani,
  • Reza Shamsabadi

摘要

The Energy dependence of the dose response is a primary characteristic of a radiation dosimeter. Although an ideal dosimeter should exhibit an independent energy response over the range of use, all types of dosimeters show some energy dependence. The current study aimed to evaluate this energy dependence of some gafchromic films in a photon field through Monte Carlo (MC) simulations using the MCNPX code. Five gafchromic films including EBT3, EBT4, HD-V2, MD-V3, and RTQA2 were considered and the energy dependence was evaluated for monochromatic and some polychromatic clinical photon beams. The results showed that all considered films show an energy dependent dose response. Specifically, the energy dependence was highly evident at photon energies below 60 keV. Among the studied films, the EBT4 and MD-V3 films showed the least and most energy dependence, respectively. Changing from monochromatic nature of photon beam to a polychromatic clinical beam changed film energy dependence response at keV energy range. Although considered gafchromic films are characterized as dosimeters with energy-independent response, all studied films showed a degree of absorbed-dose energy dependence. This observed energy dependence may be of concern in absorbed dose measurements, especially at low photon energies.