Dual Energy in an X-ray baggage scanner is a technology that uses two different X-ray energy levels to identify the type of material inside a bag. It helps the operator distinguish between organic, inorganic, and metallic objects more accurately.
Dual Energy X Ray Imaging: The Motwane X-ray generator (Source) emits:
- Low Energy X-rays
- High Energy X-rays
These two energy levels pass through the baggage simultaneously. Different materials absorb these energies differently based on their atomic number (Z value).
The scanner’s software compares the absorption levels and assigns colors:
- 🟠Organic materials (food, paper, explosives)
- 🟢Inorganic materials (ceramics, glass)
- 🔵Metals
How Low Image and High Image Are Formed?
- Low Energy Image (Soft X-ray Image)
- Produced using lower kV radiation
- More sensitive to low atomic number materials (organic substances)
- Provides better contrast for items like plastics, powders, liquids
- Shows finer details of soft materials
This image highlights objects that do not absorb much radiation.
- High Energy Image (Hard X-ray Image)
- Produced using higher kV radiation
- Penetrates dense and metallic objects more effectively
- Useful for detecting concealed items behind thick materials
- Reduces shadowing caused by heavy metals
This image clearly shows dense objects that block low energy rays.
How the Final Image is Generated?
- The detector captures both low and high energy signals.
- The system compares the absorption ratio.
- Based on the difference, the software: Calculates effective atomic number -> Assigns a specific color.
- The operator sees a color-coded composite image on the monitor.
Why Dual Energy is Important?
- Better threat detection
- Material discrimination
- Reduced false alarms
- Improved operator efficiency
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