Study Of Offline X-Ray Dosimeter Using Ldpe As A Tissue-Equivalent Sample Including Electrical Capacity Model

Nahid Madani¹, Dariush Sardari², Shahnaz Hashemi², Leila Anvariazar², Bashir Bashiri³*

¹Faculty of Physics, Kharazmi University, Karaj, (ISLAMIC REPUBLIC OF IRAN)
²Department of Medical Radiation Engineering, Islamic Azad University, Science and Research Branch,
Tehran, (ISLAMIC REPUBLIC OF IRAN)
³Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, (ESTONIA)

PAGE NO: 037-044

ABSTRACT – DOI: https://dx.doi.org/10.47204/EMSR.6.1.2024.037-044

The investigation focuses on the phenomena of charge trapping and charge transport within Low-Density Polyethylene (LDPE) samples subjected to gamma radiation. These samples, irradiated and charged with gamma radiation, produce electrons within a range proximate to the thickness of the material. Subsequently, the charged LDPE samples are stored, and their offline readout is analyzed. The study delves into the behavior of space charge generated during bipolar transport under DC high voltage, specifically examining two distinct exposing times to discern the impact of varied energy depositions on the samples. The results reveal a linear response of LDPE under voltage conditions ranging from 3.5 to 4.5 kV, highlighting a saturation dose effect within the samples.