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Abstract Bardawil Lake is a unique aquatic ecosystem that provides a habitat for various fish and other marine organisms. This study aimed to analyze the quality of fish species to prove that this lake is free of pollution, not other Egyptian lakes, due to the accumulation of some heavy metals (Cd, Pb, Cu, and Zn) in various tissues of fish species that were caught from this lake. Thirty-five fish samples were caught during the Spring of 2018 from seven different species: Mugil cephalus, Liza auratus, Sparus aurata, Dicentrarchus labrax, Siganus rivulatus, Anguilla angilla, and Solae solea. The Association of Official Analytical Chemists methods using a spectrophotometer determined the biochemical composition. In contrast, atomic absorption spectrometry (AAS) was employed to determine the heavy metals expressed by µg/g wet weight. Results exposed that the accumulation of essential micronutrient (Cu, Zn) content was higher than toxic elements (Cd & Pb) in muscles in order to Zn > Cu > Pb > Cd. Muscles

EPR, which is characterized by the non-destructive evaluation of radiation-induced radicals, is one of the most recent and accurate techniques for radiation dose measurements. Alanine has been considered the reference EPR dosimeter for several applications over decades due to its consistent response and the stability of its radiation-induced radicals. Recently, ammonium tartrate was proposed as a promising EPR dosimeter, as it possesses several prominent dosimetric features. In this work, ammonium tartrate is investigated as a possible alternative to alanine. The studied properties include sensitivity to different radiation doses, energy dependence, detection limit, and the stability of the induced radicals. Ammonium tartrate’s responses to Cs-137 gamma radiation were studied and compared with those of alanine over two ranges: the first ranged from 47 to 2500 Gy, and the second ranged from 1.46 to 87.8 Gy. The uncertainties associated with the evaluated radiation doses using EPR/the ammonium tartrate dosimetry system were evaluated and are presented in detail.