Which function does the computer perform to identify sampled alloys by comparing to a spectrum library?

• A. Move the stage
• B. Provide cooling to the detector
• C. Acquire raw data
• D. Identify sampled alloys by comparing to a spectrum library

Answer: (D)

The key operation here is identification through pattern matching against a reference library. In XRF analysis, the instrument first collects a spectrum that shows the characteristic x-ray peaks from the elements present in the sample. The computer then processes that spectrum—peak energies, intensities, and possibly background/peak shape—and compares it to entries in a spectrum library. By matching the observed peaks to those in the library, the software identifies which alloys are present and often estimates their composition. This identification step relies on the library data and matching algorithms, not on moving hardware, cooling, or simply acquiring raw data. The other options describe hardware actions (moving the stage, cooling the detector) or the data collection stage (acquiring raw data), rather than the identification process itself.