정액흔 탐색을 위한 LED 및 Laser 법광원의 비교
Comparison of LED and Laser Forensic Light Source for Detection of Semen Stain
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초록
정액흔을 효과적으로 탐색하기 위하여 LED 기반 법광원 장비인 Polilight Flare plus 2(이하PF+2)와 Laser 기반 법광원 장비인 BrightBeam Laser ULTRA (이하 BBL Ultra)의 성능과 특성을 각각비교하였다. PF+2는 주황색, BBL Ultra는 노란색 고글을 이용하였을 경우에 가장 선명한 정액흔을 발견할 수 있었으며 두 법광원의 탐색 최소한계는 큰 차이를 보이지 않았다. 특이성 연구결과, 소변, 커피 및 주스에서 비교적 약한 형광이 관찰되었고 질액, 혈액 및 타액에서는 형광이 관찰되지 않았으며일부 시료들 간의 미세한 형광색상 및 밝기 차이를 구분하는데 BBL Ultra가 PF+2보다 효과적이었다. 색상의 종이에 부착된 정액흔 시험결과로부터 빨간색과 분홍색에서 PF+2로는 보이지 않았던 정액흔이BBL Ultra를 사용하였을 때 관찰되었다. 그러므로 범죄현장 증거물로부터 다양한 정액흔을 탐색하는데BBL Ultra가 PF+2보다 더욱 효과적인 것으로 판단되었다
Abstract
In this study, we compared two Forensic Light Sources (FLSs), LED-based Polilight Flare plus 2 (PF+2) and Laser-based BrightBeam Laser ULTRA (BBL Ultra), in order to detect semen stain from crime scene evidences. The best combinations of FLSs and goggles for detecting semen stain were PF+2/orange and BBL Ultra/yellow, respectively. There were no significant difference in sensitivity for both FLSs. In specificity study, urine, coffee, and juice showed relatively low intensity of fluorescence by both FLSs, however no fluorescence were detected for vaginal fluid, whole blood, and saliva. We found that BBL Ultra is superior to distinguish subtle color and brightness difference between several samples. From the results of background effect tests using semen stain on colored paper, it was shown that PF+2 could not detect the semen stain on the red and pink paper, but BBL Ultra could detect the semen stain. Therefore, we suggested that BBL Ultra was suitable forensic light source for detection of semen stains.
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