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Preparation of a low-cost fingerprint powder that harnesses white light to emit long-lived phosphorescence |
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| Institution: | 1. School of Environment and Science, Griffith University, 170 Kessels Road, Brisbane, QLD 4111, Australia;2. Quality Management Section, Forensic Services Group, Queensland Police Service, Brisbane, 4000 QLD, Australia;1. Centre for Forensic Science, Department of Applied Sciences, Faculty of Health & Life Sciences, Northumbria University, Ellison Building, NE1 8ST Newcastle Upon Tyne, United Kingdom;2. Northumbria Sport, Northumbria University, NE1 8ST Newcastle Upon Tyne, United Kingdom;3. King’s Forensics, Department of Analytical, Environmental & Forensic Sciences, King’s College London, SE1 9NH London, United Kingdom;1. Institute of Law, Psychiatry, and Public Policy, University of Virginia, United States;2. Houston Forensic Science Center, United States;1. University of Texas Southwestern, 1801 Inwood Rd, Dallas, TX 75390-9132, USA;2. Friendly Foot Care, PC, 50 W. 94th Place, Crown Point, IN, USA;3. Former Research Scholar, Department of Anthropology, Panjab University, 160014, Chandigarh, India;4. Department of Forensic Medicine & Toxicology, Medical College Building, All India Institute of Medical Sciences, Jodhpur, Rajasthan 342005, India;5. Department of Anthropology, Panjab University, Chandigarh, India;1. Centre of Forensic Sciences, 25 Morton Shulman Avenue, Toronto, Ontario M3M 0B1, Canada;2. Centre of Forensic Science, Royal College Building, University of Strathclyde, 204 George Street, Glasgow, Scotland G1 1XW, United Kingdom;1. Institute of Law, Psychiatry, and Public Policy, University of Virginia, United States;2. Houston Forensic Science Center, United States;3. Carnegie Mellon University, United States |
| Abstract: | An inexpensive, commercially available doped strontium aluminate phosphor with long-lived afterglow has been prepared and assessed in the role of a luminescent fingerprint dusting powder. Blue, green, and aqua phosphorescence persisting for ca. 30 s was obtainable from treated fingermarks after charging the powders with the white light (400–700 nm) setting of a forensic light source. Imaging the phosphorescent afterglow enabled the elimination of background emissions encountered during latent fingermark examination. This was demonstrated by visualising fingermarks on substrates that possess inbuilt fluorescent security features and highly patterned substrate backgrounds, without any need for bespoke scientific equipment. |
| Keywords: | Fingerprint powder White light Phosphorescence Fingerprint development Doped strontium aluminate CAST"} {"#name":"keyword" "$":{"id":"k0035"} "$$":[{"#name":"text" "_":"Centre for Applied Science & Technology Hz"} {"#name":"keyword" "$":{"id":"k0045"} "$$":[{"#name":"text" "_":"hertz ISO"} {"#name":"keyword" "$":{"id":"k0055"} "$$":[{"#name":"text" "_":"International Standards Organization IFRG"} {"#name":"keyword" "$":{"id":"k0065"} "$$":[{"#name":"text" "_":"International Fingerprint Research Group JPEG"} {"#name":"keyword" "$":{"id":"k0075"} "$$":[{"#name":"text" "_":"Joint Photographic Experts Group nm"} {"#name":"keyword" "$":{"id":"k0085"} "$$":[{"#name":"text" "_":"nanometres OSHA"} {"#name":"keyword" "$":{"id":"k0095"} "$$":[{"#name":"text" "_":"Occupational Safety and Health Administration SS"} {"#name":"keyword" "$":{"id":"k0105"} "$$":[{"#name":"text" "_":"shutter speed UV"} {"#name":"keyword" "$":{"id":"k0115"} "$$":[{"#name":"text" "_":"ultraviolet |
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