Corrosion Detection Using Coherent Scatter
Abstract
A software model was developed which calculated the spectral response for directly irradiated samples, and for samples indirectly irradiated using reflection and transmission fluorescers. The modeled geometry allowed for selection of x-ray incident and exit angles for the fluorescer and the sample, and for variations in the collimation and filtration of all elements. The model allowed for the use of either Si(Li) or HPGe detectors, with calculation of the R/O ratio based on the selection of energy thresholds. Use of the model allowed the optimization of geometry and selection between the variety of source modes. As a bonus, the model was instrumental in identifying improvements in the source filtration which substantially improved the efficiency with which we can extract the signature. Both direct and indirect excitation modes were evaluated experimentally. As predicted by the model, the direct excitation mode provided faster detection. The accuracy of the model was quite good, which gave us confidence in its ability to model the throughput of subsequent imaging systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1996
- Accession Number
- ADA356322
Entities
People
- Cary I. Pincus
- Jerel A. Smith