Estimation of the Age of Semen Stain on the Different Supporting Objects and Conditions

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Juthathip Thepsit
Thiti Mahacharoen

Abstract

The aim of this research is to study the surface characteristics and chemical components of 3 types of fibers which are toray tr, denim and slag in order to compare semen stain on the fabrics in the different temperature conditions: cold temperatures (4-8°C), room temperature (24-29°C) and hot temperature (30-35°C). This research determines a period of time on 1, 3 and 13 days for estimating the age of semen stain on fabrics.


The result of the research shows that semen contains the main components which are water (H2O) and amino acids (C, H, O, N). The interest of this research is to study the 2 elements, carbon (C) and oxygen (O), that are coated on surface of the 3 types of fabrics after dropping semen 1, 3 and 13 days. The researcher analyzes the chemical composition (%Wt) of the semen stains on the fabric using the EDS that can detect only the surface fabric. The results show that over time, the amount of carbon (C) increases %wt due to the breakdown of the semen stains that are coated on the surface of the fabric, allowing it to be deeper into the fabric fibers. The oxygen content (O) decreases in %wt due to the degradation of the main water components of semen stains that are coated on the surface of the fabric until close to the amount of chemical composition of the fabric without semen stains. On day 1, semen stains were found on the surface than other periods. The research results show that the estimation the age of semen stains using a Scanning electron microscope/Energy Dispersive X-ray Spectroscopy (SEM/EDS) can be used to confirm the approximate age of the semen stains non-destructive.

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How to Cite
Thepsit, J., & Mahacharoen, T. (2021). Estimation of the Age of Semen Stain on the Different Supporting Objects and Conditions. Journal of Criminology and Forensic Science, 7(1), 12-22. Retrieved from https://so02.tci-thaijo.org/index.php/forensic/article/view/242904
Section
Research Articles

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