By Norman Marin
Alternate gentle resource Imaging presents a short advisor to electronic imaging utilizing mirrored infrared and ultraviolet radiation for crime scene photographers. transparent and concise guideline illustrates how one can accomplish solid images in various forensic occasions. It demonstrates how tunable wavelength mild resources and electronic imaging strategies can be utilized to effectively find and rfile actual proof on the crime scene, within the morgue, or within the laboratory. The medical rules that make this kind of images attainable are defined, by way of the fundamental steps that may be applied to trap top of the range evidentiary photos.
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Extra resources for Alternate Light Source Imaging. Forensic Photography Techniques
It was determined that the best contrast was achieved with 430 nm illumination and a yellow barrier filter. Contrast was created because the background fluoresced and the bloodstains absorbed the radiation and appeared dark. In fact much of the original pattern could be visualized. The sensitivity of detecting dilute bloodstains with ALS was also investigated. One drop, 25 microliters of serial diluted blood from 1021 to 1027, was placed on Whatmans filter paper and allowed to dry. A negative control consisting of only distilled water was also used.
Blood by contrast absorbs radiation extending from the UV into the IR, with the strongest absorption in the UV/blue-violet region of the electromagnetic spectrum Most bodily fluids will respond to radiation from a UV source. However, depending on the supporting material, the background may fluoresce as well, minimizing any observable contrast in the subject. With a tunable wavelength source, the examiner may tune the wavelength of light and change barrier filters to minimize background fluorescence.
Since blood has strong absorption characteristics, it will appear dark. Contrast can be created between the bloodstains and its substrate if the background reflects or absorbs the radiation relative to the bloodstains or if the background is actively fluorescent. The authors had a homicide case where the decedent’s wife was accused of shooting her husband, three times, in the head at close range with a firearm belonging to the deceased. No blood or tissue was found on the weapon. In fact the weapon was pristine but exhibited signs of corrosion on some metal surfaces.
Alternate Light Source Imaging. Forensic Photography Techniques by Norman Marin