Dosimetry for low energy electrons in the range of 12 to 45 keV with EBT3 GafChromic films.

Abstract

Objective Low energy electrons (LEE) in the range of tens of keV combine high relative biological effectiveness (RBE) with low penetration depth in tissue, making them an interesting tool for radiobiological studies. To harness these advantages, a reliable and comprehensible dosimetry method is essential. Approach Unlaminated EBT3 GafChromic films were evaluated as potential LEE dosimeters, given the limitations of other dosimetry tools for LEE applications. The depth dose profile of the LEE in the film was simulated and then combined with the experimentally determined response of the film to a calibrated radiation source. Using this, the total response of the film for a given average dose was calculated. Main results A calibration curve for unlaminated EBT3 GafChromic films for LEE in the energy range of 12 keV to 45 keV has been successfully developed for a range of average doses from 0 Gy to 16 Gy. Significance The developed calibration curve enables direct, quantitative comparison of biological experiments using LEE with other types of radiation such as x-rays, facilitating the adoption of LEE in radiobiological research.