forensic glass analysis case study

The gradient tube should stand overnight before being used so that the liquids will diffuse into each other to form a gradient.

185–187. Arbab, M., Shelestak, L. J., and Harris, C. S. Value-added flat-glass products for the building, transportation markets, part 1.

Parouchais, T., Warner, I. M., Palmer, L. T., and Kobus, H. The analysis of small glass fragments using inductively coupled plasma mass spectrometry. George Allen & Unwin Ltd, London, England, 1972, pp.

To date, Clark does not have a criminal record.Paul Ekman was coincidentally onsite during the interview, and was asked to examine the video of the interview. What did you find? Australian Federal Police, 1993.

A beam of monochromatic light is directed through the vapor, and the absorption is measured. This is a precise way of matching a sample to a possible source.

During experimental studies, glass fragments have been recovered from up to four meters away from a breaking glass object (Francis 1993; Locke and Unikowski 1991). Most modern, commercially produced glass is manufactured in a nonstop process wherein raw materials are fed continuously into one end of a melting tank and liquid glass is drawn from the other end.

Underhill, M. Multiple refractive index in float glass. FSS Report No.

Arribart, H. and Abriou, D. Using atomic force microscopy for study of glass surfaces: Part 1.

Flameless atomic absorption spectrometry provides accurate, precise measurements and is a well-developed and widely accepted technique (Koons 2002). In: GIA Gem Identification.

Police obtained the necessary documents and seized the equipment relating to the allegation.

This must accurately reflect the content of your report and must be generated automatically in Microsoft Word with page numbers. The forensic significance of glass composition and refractive index measurements, Journal of Forensic Sciences (1999) 44:496–503.

Stoecklein, W. Fluorescence in Glass. The second, third, and fourth layers should each be about half the height of the first layer. He suggested the use of a monochromator and hot stage to allow for the variation of temperature and wavelength simultaneously.

See our User Agreement and Privacy Policy. All samples must be labeled according to where they came from (the original window, a broken fragment on the floor, the inside of the window, the outside, etc.). Color assessment is performed visually against a white background in natural light with the particle on edge. Andrasko, J. and Maehly, A. C. The discrimination between samples of window glass by combining physical and chemical techniques, Journal of Forensic Sciences (1978) 23:250–262.

I. Laminated glass is produced by heat-sealing thin layers of plastic between two or more panes of heat-strengthened glass. Alain Baxter

Earn Transferable Credit & Get your Degree, Paint as Forensic Evidence: Purpose, Collection & Preservation, Forensic Soil Analysis: Evidence & Testing, Tool Marks Forensic Examination: Methods & Purpose, Tire Marks Forensic Examination: Methods & Purpose, Fiber Analysis in Forensics: Procedure & Results, Impression & Pattern Evidence: Definition & Process, Forensic Firearm Investigation: Procedures & Results, Alteration, Obliteration, & Ink Examination, Understanding the Differences in Human & Animal Hairs, Microscopic Hair Analysis: Procedure & Results, Footwear Forensic Examination: Methods & Purpose, Visible & Plastic Fingerprints: Types & Differentiation, Forensic Drug Analysis: Purpose & Process, Latent Fingerprint: Analysis, Development & Techniques, Forensic Laboratories: Description & Services, Infrared Spectroscopy in Forensics: Definition & Uses, Trace Evidence: Definition, Analysis & Examples, Questioned Document Examination (QDE): Definition & Purpose, Criminal Justice 101: Intro to Criminal Justice, DSST Criminal Justice: Study Guide & Test Prep, Criminal Justice 306: Research Methods in Criminal Justice, Introduction to Criminal Justice: Certificate Program, Human Anatomy & Physiology: Help and Review, Introduction to Management: Help and Review, DSST Health & Human Development: Study Guide & Test Prep, UExcel Anatomy & Physiology: Study Guide & Test Prep. Samples adequately large for these methods are rarely encountered in forensic casework (Koons et al.

However, FAAS is a relatively slow analysis because each element is analyzed sequentially. Results of Window Breaking Experiments in the Birmingham Laboratory. 's' : ''}}.

Scientific Working Group for Materials Analysis (SWGMAT). Becke line and dispersion staining methods cannot, therefore, measure the true variability of glass and may not be able to differentiate between glasses with similar but genuinely different refractive indices. Because thickness produces a quantitative measure, the precision and accuracy of the micrometer must be considered when evaluating the results of thickness measurements. Tie thread around glass.

Examination of samples under a regular microscope or a scanning electron microscope can give detailed information about the sample's physical and chemical characteristics.

Locke, J., Winstanley, R., Rockett, L. A., and Rydeard, C. A comparison of long and short schedules for the annealing of glass particles. 1996; Hoefler et al.

Lau, L., Beveridge, A. D., Callowhill, B. C., Conners, N., Foster, K., Groves, R. J., Ohashi, K. N., Sumner, A. M., and Wong, H. The frequency of occurrence of paint and glass on the clothing of high school students, Canadian Society of Forensic Science Journal (1997) 30:233–240. Hickman, D. A., Harbottle, G., and Sayre, E. V. The selection of the best elemental variables for the classification of glass samples. Additionally, there can be secondary transfer of glass between people and objects, such as when glass is transferred from a person to a vehicle seat (Allen et al. The Frequency of Occurrence of Glass Fragments in Head Hair Samples—A Pilot Investigation. Detection limits for most elements by ICP-OES are on the order of 0.01 μg/g; and for ICP-MS, 0.001 μg/g.

The glass must then be recovered. Corning, Incorporated, Corning, New York, 1998. ASTM C162-05 Standard Terminology of Glass and Glass Products.

Use numbers to support or extend the extent of any crimes that have been committed. A glass sample can be visualized under a microscope to determine its unique surface features, such as finishes, patterns, dents, grooves, or similar traits. Harrison, P. H., Lambert, J. RR 777. If you continue browsing the site, you agree to the use of cookies on this website. These furnaces are capable of producing a limited amount of glass, ranging from one to five tons of glass per day (Tooley 1974). The transfer of glass—Part 3: The transfer of glass from a contaminated person to another uncontaminated person during a ride in a car, Forensic Science International (1998c) 93:195–200.

Federal Bureau of Investigation.

1 Weird Trick To Easily Cure Vitiligo For Good In As Little As 7 Days - Guaranteed! Allen, T. J. and Scranage, J. K. The transfer of glass—Part 1: Transfer of glass to individuals at different distances. c. SUSPEND the glass in water. Glass density determination. All other trademarks and copyrights are the property of their respective owners. Northern Ireland Forensic Science Laboratory, Belfast, Ireland, 1987. 2002). Guttman, P. Assessment of batch raw materials.

Laboratory Division. John Wiley & Sons, New York, 1977. International Laboratory Accreditation Cooperation (ILAC). Coleman, R. F. and Goode, G. C. Comparison of glass fragments by neutron activation analysis. 1976).

Guttman, P. Assessment of batch raw materials, The Glass Researcher: Bulletin of Glass Science and Engineering (1996) 5:5–6. The two specimens have been shown to have different sources.

Glass analysis is used by both the glass industry and the forensic community.

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Coleman, R. F. and Goode, G. C. Comparison of glass fragments by neutron activation analysis, Journal of Radioanalytical Chemistry (1973) 15:367–388. Neutron activation analysis has the advantage of being a nondestructive and extremely sensitive form of chemical analysis. The assessment of color in glass can be difficult.

The MD5 hash of the forensic image is “044288459e2fd193e446eec8de0acdd9”. ILAC-G19:2002. Latkoczy, C., Becker, S., Dücking, M., Günther, D., Hoogewerff, J. The basis for neutron activation analysis (NAA) is the measurement of the radioactivity induced as a result of irradiation by nuclear particles.

Method 973.65, characterization and matching of glass fragments: Dispersion microscopy (double variation method).

All rights reserved. Searching for any suspects who may have glass samples on their clothing or in their hair begin immediately, as this kind of evidence is often gone after the first 24 hours.

Accounts CRC Press, Boca Raton, Florida. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Trace Evidence Unit: Casework assignment and review procedures. Over the next several years, the concentrations of additional elements in glass by inductively coupled plasma-optical emission spectrophotometry were determined, and 6 to 10 element classification schemes based on comparison with a glass database divided into nine product categories were developed (Hickman 1981; Hickman et al.

Ratios of the intensities of some of the major and minor elements in glass can be used to discriminate between sources of glass, with 38 of 40 specimens being distinguishable in one study (Andrasko and Maehly 1978).

Samples of glass should not be put in glass vials, but cardboard boxes, paper bindles, or envelopes of some kind should be used. Cold cases may thus be a challenge. Hughes, J. C., Catterick, T., and Southeard, G. The quantitative analysis of glass by atomic absorption spectroscopy, Forensic Science (1976) 8:217–227. Additionally, SWGMAT’s Expert Reporting Guideline (SWGMAT 2009) offers additional advice on what should be included in a report.

Most methods of glass composition analysis are destructive. Misture, S. T. X-ray scattering used to characterize surfaces and thin films, The Glass Researcher: Bulletin of Glass Science and Engineering (1999) 9:5,19.

Forensic Science Service, Birmingham, England, 1978. 1997). Buck Ruxton Beverly Allitt Glass densities by settling method: Water-bath apparatus for production control in glass plants.

revision 2. The most important of these considerations in interpreting the results of glass analyses is that the variations within an object are typically smaller than the variations among objects. 2002; SWGMAT 2005e). If a window or glass object is broken or shattered by a projectile, such as a bullet, the breakage pattern can be analyzed to possibly determine the angle of trajectory of the projectile, shedding more light on the crime, such as where the suspect was when the gun was fired.

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