เปรียบเทียบอนุภาคของเขม่าที่ได้รับจากการประกอบอาชีพและเขม่าปืนชนิด Lead-free (Comparison of Particles of Occupation Origins Residues and Lead-free Gunshot Residues)

Abstract

The objective of this research is to analyze the differences between the particles of occupation origins and gunshot residues (GSR) delivered from Lead-free ammunitions. The results can be used as a guide to identify who is innocent of a crime. The studies focused on the elemental composition of particles of occupation origins in 1-15 µm spherical shape, and compare the morphology of the particles with particles of Lead-free GSR. The determinations were carried out using SEM/EDX. The results show that the most of particles contained Si as the major component and Al as the minor elements. A group of particles is an essential element of Lead-free GSR particles and can be found at installation and repair automotive glass workers, automotive painters, and ceramic workers. The comparison with particles of Lead-free GSR found that only particles from the automotive glass workers -6 contained the elemental composition which is the same as particles from Winchester WinCleanTM, and the automotive painters-4 which have elements of similar particles of Remington/UMC LeadLessTM. By studying and analyzing the morphology of those particles, the results are different from particles of Lead-free GSR.