A novel approach to determine post mortem interval using neutron radiography.

Area of Science:

• Forensic Science
• Biophysics

Background:

• Determining post-mortem interval (PMI) is crucial in forensic investigations.
• Current PMI methods are sensitive to environmental factors and decomposition variability.
• Tissue changes after death involve alterations in water content and elemental composition.

Purpose of the Study:

• To evaluate neutron radiography (NR) as a method for objectively determining PMI.
• To measure changes in hydrogen (H) content during tissue decomposition.
• To correlate hydrogen depletion with the time since death.

Main Methods:

• Canine cadavers were used as a model for human decomposition.
• Tissues were analyzed using neutron radiography under controlled and uncontrolled environmental conditions.
• Neutron radiographs were supplemented with photographic and histological data.

Main Results:

• Increased neutron transmission correlated with decreased hydrogen content in decaying tissues.
• Tissues with lower hydrogen content appeared brighter in radiographs.
• Lung and muscle tissues showed greater changes in neutron transmission than bone over 10 days.

Conclusions:

• Neutron radiography can detect hydrogen abundance changes related to PMI.
• This technique shows potential for objective PMI determination in forensic science.
• Further research is needed for uncontrolled environmental conditions.