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.
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.