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Objective colour analysis from digital images as a nuclear forensic tool.

Nathan B A Thompson1, Sarah E O'Sullivan1, Robert J Howell1

  • 1University of Sheffield, Department of Materials Science and Engineering, Sir Robert Hadfield Building, Sheffield, S1 3JD, UK.

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Summary

This study introduces a standard method using Red, Green, and Blue (RGB) values from digital images to objectively quantify the color of uranium oxide powder. This technique successfully determined the heating temperatures of unknown studtite samples.

Keywords:
ColourNuclear forensicsObjectivePhotographyUranium peroxide

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Area of Science:

  • Nuclear forensics
  • Materials science
  • Analytical chemistry

Background:

  • Digital images comprise pixels, each with Red, Green, and Blue (RGB) components (0-255 values).
  • Quantitative color analysis of nuclear materials is crucial for objective forensic applications.
  • Studtite ([(UO2)(O2)(H2O)2]·2H2O) is a uranium oxide relevant to nuclear material studies.

Purpose of the Study:

  • To establish a standardized method for photographing and analyzing digital images of uranium oxide powder.
  • To objectively quantify powder color using mean RGB values.
  • To correlate color changes with heat treatment temperatures.

Main Methods:

  • Standardized photography of eight heat-treated studtite samples (up to 550°C) at room temperature.
  • Analysis of digital images using the Red, Green, and Blue (RGB) color model.
  • Calculation of mean RGB values, hue, saturation, and value for each sample.

Main Results:

  • Mean RGB values were successfully obtained for all studtite samples.
  • Hue, saturation, and value were determined alongside RGB values.
  • The colorimetric data accurately determined the heating temperatures of unknown studtite specimens.

Conclusions:

  • The RGB method provides an objective and quantitative approach to assess uranium oxide powder color.
  • Digital image analysis of color can be reliably used to determine the thermal history of studtite.
  • This method offers a consistent analytical tool for nuclear forensics and materials characterization.