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Simulating irradiation power density on body surface in postmortem cooling.

Gita Mall1, Michael Hubig, Andreas Büttner

  • 1Institute of Legal Medicine, University of Munich, Frauenlobstrasse 7a, 80337 Munich, Germany. gita.mall@rechts.med.uni-muenchen.de

Legal Medicine (Tokyo, Japan)
|March 25, 2004
PubMed
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Accurately determining time since death using temperature is hindered by irradiation. This study introduces new formulae and a computer program to calculate radiation power density on body surfaces, improving postmortem cooling models.

Area of Science:

  • Forensic Science
  • Physics
  • Heat Transfer

Background:

  • Irradiation complicates accurate postmortem cooling estimations using temperature-based methods.
  • Existing empirical and heat-flow models do not adequately account for irradiation effects.
  • Heat-flow models are theoretically better suited for incorporating irradiation due to their foundation in heat transfer physics.

Purpose of the Study:

  • To develop formulae for simulating radiation power density on a semi-cylindrical body surface.
  • To implement these formulae in a computer program for practical application.
  • To address the challenge of irradiation in postmortem cooling estimations.

Main Methods:

  • Development of mathematical formulae to calculate radiation power density from a nearby rectangular radiant heater and the sun.

Related Experiment Videos

  • Implementation of these formulae into a computer program for simulation.
  • Inclusion of self-shading functions for the semi-cylindrical body and external shading elements (radiant heater panel).

    • Main Results:

    • The study successfully simulated radiation power density on a semi-cylindrical surface for both radiant heater and solar irradiation scenarios.
    • Maximum calculated power density from a 2000W radiant heater was 418W/m².
    • Maximum calculated power density from simulated midday summer sun in Central Europe was 422W/m².

    Conclusions:

    • The developed formulae and program provide a method to quantify irradiation, a critical factor in heat-transfer-based postmortem cooling models.
    • Accurate calculation of irradiation power density is essential for improving the reliability of time since death estimations.
    • The findings offer a significant advancement for forensic science in addressing environmental factors affecting decomposition analysis.