Alternate Light Source Imaging. Forensic Photography by Norman Marin

By Norman Marin

Alternate gentle resource Imaging offers a short consultant to electronic imaging utilizing mirrored infrared and ultraviolet radiation for crime scene photographers. transparent and concise guide illustrates find out how to accomplish stable photos in various forensic events. It demonstrates how tunable wavelength mild assets and electronic imaging concepts can be utilized to effectively find and rfile actual facts on the crime scene, within the morgue, or within the laboratory. The clinical ideas that make this sort of images attainable are defined, by means of the elemental steps that may be applied to seize top of the range evidentiary images.

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By examining the transmission curve for the #18A, we notice that the filter transmits very efficiently between 250 and 400 nm with its peak at about 325 nm. The filter blocks visible radiation between 400 and 680 nm. 3 UV focus shift through a simple lens. 4 Transmission curve for the #18A filter. between 680 and 800 nm. This unwanted transmission in the near-IR region is commonly called an IR leak. When using this filter, one must take special precautions to carefully control the illumination.

UV can be used to document surface characteristics of the skin and superficial injuries such as scratches cuts, and bite marks. Radiation longer in wavelength than near-UV will have a better depth of penetration into tissue and should be used for imaging bruises and injuries that may be healing. 8 DOMESTIC VIOLENCE INJURIES When examining domestic violence cases where the victim has survived, the circumstances of the case, the time, and the type of injury need to be carefully considered. A review of medical records or an interview with a physician who is familiar with the case should be performed prior to the examination.

Gunshot residue is particularly labile and can be lost readily. A nondestructive approach is therefore necessary prior to chemical and instrumental analysis. Fluorescence can be induced in the partially burnt organic constituents of gunshot residue. 14AÀD). Pizzola (1998) studied the photoluminescence of gunshot residues extensively. The technique involves treating the gunshot residues in situ with 1M hydrogen chloride (1M HCl) followed by immersion in liquid nitrogen. The chloride ion can form a complex with the fine vaporous lead, antimony, and any such metal deposits that may reside on the particulate.

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