AN X-RAY SPECTRAL DATABASE FOR FORENSIC APPLICATIONS€¦ · AN X-RAY SPECTRAL DATABASE FOR...
Transcript of AN X-RAY SPECTRAL DATABASE FOR FORENSIC APPLICATIONS€¦ · AN X-RAY SPECTRAL DATABASE FOR...
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AN X-RAY SPECTRAL DATABASE FOR
FORENSIC APPLICATIONS
Dennis WardFederal Bureau of Investigation
Quantico, DC 22135
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Characterize
Compare
Identify
What are the structural and chemical characteristics?
Could items have come from the same source?
What is it?
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Existing Deficiencies in SEM/XRF Utilities
• “Quant based”• Cannot search for best fit• Cannot compare specific compositions • Cannot search for text information• Cannot display nested spectra• Cannot associate an image with
spectrum
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Spectrum Analysis WindowSpectrum Analysis Window
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Select Search CriteriaSelect Search Criteria
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Best Fit SearchBest Fit Search
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Compare Case SpectraCompare Case Spectra
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• Demonstrate GSR particle populations• Demonstrate “other” populations • “Unusual” particle composition query• Bullet lead/jacket composition “screen”
Summary of uses(GSR/Firearms)
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Individual recordIndividual record
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“Projects”“Projects”(Speer Lawman 9mm Luger)
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“Best fit” query“Best fit” queryExample: Winchester Super Clean NT primer cup
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Query for specific compositionQuery for specific compositionExample: Example: SbSb >5%>5% SbSb, , BaBa >5% >5%
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view GSR populationview GSR populationExample: Winchester 25 auto
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“environmental” particle composition“environmental” particle compositionExample: Brake particles
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Confirm questioned particle to GSRConfirm questioned particle to GSR
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SWGFAX(Scientific Working Group for the Forensic
Archive of X-ray spectra)
• Belgium, US, Germany, Canada, and California
• Confirmed utility of database• Consensus for design
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♦ MATERIAL IDENTIFICATION ♦ PRODUCT IDENTIFICATION♦ MANUFACTURER IDENTIFICATION♦ CRITICAL SUDIES OF COMPOSITION
♦ FBI LABORATORY♦ FEDERAL LABORATORIES♦ INDUSTRY♦ STATE AND LOCAL CRIME LABORATORIES
NATIONAL XNATIONAL X--RAY DATABASERAY DATABASE(PROPOSED FOR DEVELOPMENT)
Spectral Library and Classification Explorer, developed by the FBI and xk, Inc. as a “stand alone” application for spectra management
Scanning Electron Microscope
X-ray Fluorescence - laboratory use
X-ray Fluorescence - field use
(proposed for development)
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SS 316
SEM/EDS
SS330.str
Fe
Cr
Ni
Cr, (Mn) Fe
Ni????
SS 330
0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00
SS 316 XRF
SS 316 Micro
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First response capability
• Elemental analysis• Wide elemental range (Mg +)• Qualitative• Portable (suitcase size)• Interface to database (SLICE)• = XRF
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www.fbi.gov
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