U.S. flag

An official website of the United States government, Department of Justice.

Effect of Ionizing Gamma Radiation on Natural and Synthetic Fibers and Its Implications for the Forensic Examination of Fiber Evidence

NCJ Number
234638
Journal
Journal of Forensic Sciences Volume: 56 Issue: 3 Dated: May 2011 Pages: 591-605
Author(s)
Michael Colella, M.Sc.; Andrew Parkinson, B.Sc.; Tegan Evans, B.Sc.; J. Robertson, Ph.D.; Claude Roux, Ph.D.
Date Published
May 2011
Length
15 pages
Annotation

Circumstances of criminal activities involving radioactive materials may mean fiber evidence recovered from a crime scene could have been exposed to materials emitting ionizing radiation. The consequences of radiation exposed fibers on the result of the forensic analysis and interpretation is explored.

Abstract

The effect of exposure to 1-1000 kGy radiation doses in natural and synthetic fibers was noticeable using comparative forensic examination methods, such as optical microscopy, microspectrophotometry, and thin-layer chromatography. Fourier transform infrared spectroscopy analysis showed no signs of radiation-induced chemical changes in any of the fiber structures. The outcome of the comparative methods highlights the risk of "false negatives" associated in comparing colors of recovered fibers that may have been exposed to unknown radiation doses. Consideration of such results supports the requirement to know the context, including the environmental conditions, as much as possible before undertaking a forensic fiber examination. (Published Abstract)

Date Published: May 1, 2011