A method and apparatus for the remote, non-invasive detection or characterization of materials manifests a controlled temperature perturbation to the sample material location concurrently with sample interrogation by ionizing radiation and with detection of the response emission energy spectra. The spectral noise power density estimation unit may provide a first estimate of the spectral noise power density of the audio signal. Multiple electronic forms are accessible to the customer at a single access point, such as a web site. The control apparatus 10 calculates the level of similarity between a bright line 4jX projected onto the second image and a bright line on the second image and determines a result of identified correspondence relationship between the bright line 4jX and the bright line on the second image.