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richly detailed information about the contents of a parcel or container

Transmission X-rays provide high-energy with high-performance for greater penetration and detection—even in dense cargo. In addition, Z Backscatter® technology can complement transmission X-rays by providing context and clarity to expedite inspections and further visualize the shape and form of cargo contents for manifest verification and contraband detection.

transmission X-ray technology

AS&E systems with transmission X-ray technology use electronically generated X-rays to examine an object. When X-rays interact with matter, they do one of three things:

  • Pass through the object
  • Get absorbed by the object
  • Scatter from the object

Traditional transmission X-ray images like medical X-rays result when X-rays pass through an object to a detector located on the far side of the object. Objects with greater density block or absorb more X-rays than objects with lesser density. These dense objects produce the characteristic “shadowgram” images similar to medical X-rays. Transmission images are generally high-resolution and result from the X-ray beam being absorbed by objects of varying densities.

Dual-Energy Transmission

For parcel systems, dual-energy transmission X-rays generate a high resolution image in which metallic threats such as guns and knives are easily detected and fine details such as tiny wires that could indicate an improvised explosive device are discerned. Dual-Energy transmission technology uses two X-ray energy levels to determine the atomic number of objects under examination, and then colorizes the image based on material type. Organic materials are orange, mixed materials are green, and metallics are blue.

High-Energy Transmission

For cargo systems, high-energy, high-performance transmission X-rays deeply penetrate densely loaded containers for greater detection. High-energy transmission X-rays provide fine details, even while penetrating up to 400 mm of steel — and offer a reliable means of detecting threatening materials, weapons, and contraband hidden in cargo containers, tankers, and large vehicles. The OmniView Gantry offers the option to scan in single energy or dual energy modes. When scanning in dual energy mode organic materials are displayed in orange, mixed materials in green, metallics in blue and heavy metals in purple (cargo systems only).

Combination of Technologies

Transmission technology can reveal fine details with superb resolution, and can offer some level of material discrimination with dual-energy. However, the more objects or clutter in the path of the beam, the less object and material differentiation is achieved. Because of this, many AS&E products offer a combination of Z Backscatter and transmission technology to give inspectors richly detailed information about the contents of a parcel or container. Z Backscatter photo-like images also complement transmission X-rays by providing context and clarity to expedite inspections.

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