ENERGY DISPERSIVE X-RAY ABSORPTION SPECTROSCOPY IN SCANNING TRANSMISSION MODE INVOLVING THE CALCULATION OF THE INTENSITY RATIOS BETWEEN SUCCESSIVE FREQUENCY BANDS

摘要

A method and apparatus for obtaining radiation transmission data comprising information about the composition of an object are described. The principle involves providing a radiation source such as an x-ray or gamma-ray source and a radiation detector system such as an x-ray or gamma-ray detector system, the detector system being capable of detecting and collecting spectroscopically resolvable information about incident radiation; collecting a dataset of information about radiation incident at the detector; resolving the dataset spectroscopically.across a plurality of frequency bands within the spectrum of the source to produce a corresponding plurality of frequency-specific datasets; determining an intensity ratio for at least one pair of frequency specific datasets; using this to identify materials present.