THE UTILITY OF X-RAY DUAL-ENERGY TRANSMISSION AND SCATTER TECHNOLOGIES FOR ILLICIT MATERIAL DETECTION
By Qiang Lu Committee Chairman: Richard W. Conners Computer Engineering
X-ray devices have demonstrated the ability to characterize a material at the molecular and atomic levels. This ability is particularly important for detecting plastic explosives, where object shape information cannot be used. X-ray devices are relatively inexpensive compared to many other detection technologies. X-ray technology is considered as the technology for detecting illicit materials. Using x-ray technology, a material’s density- and effective atomic number or Zeff-related information can be determined. In theory, an illicit material can be identified using those two pieces of information.
This dissertation discusses explosives detection in passenger luggage bags. technology used is called R-L multi-sensing technology. The R-L technology was researchers at Virginia Tech. It is the first true multisensing technology used
The x-ray developed by for explosive
detection. It uses values of an object,
dual-energy transmission and scatter technologies to obtain characteristic i.e., R and L. The material type of this object can then be determined using
R-L plane. modality.
The characteristic R is related to Zeff.
R is computed using signals from dual-energy transmission characteristic value L is computed using signals from low-
energy transmission and scatter modalities. L is related to density. technologies and pseudo multi-sensing technologies, the detection should be much higher.
Compared to single-sensing accuracy of R-L technology