When a gun is fired, a number of particles and gases, which are called gunshot residue (GSR), are released. Detection of GSR particles, as an important step to solve a case, potentially indicates that a person fired a gun or somehow involved the shooting event in a close distance to discharged gun [1,2]. GSR particles consist of a combination of lead (Pb), antimony (Sb), and barium (Ba), and other elements may accompany this characteristic structure [3].Various methods are utilized in GSR analysis, which can be detected frequently on individuals' body parts, especially in the hand and around the gun. SEM/EDX is the leading method with its specificity in evaluating the morphological and analytical properties of GSR and is currently considered as the gold standard [4]. During last

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