PPA, A COMPUTER PROGRAM FOR PHOTO-PEAK ANALYSIS

摘要

PPA (photo-Peak Analysis) is a simple FORTRAN computer code, that fits photo-peaks in pulse-height gamma-ray scintillation spectra, and gives results in terms that are immediately useful to the gamma-ray spectroscopist. PPA fits experimental data with a Gaussian (Normal) distribution function, containing a linear bias term through the use of an iterative, least-squares technique. As many as five photo-peaks can be fitted by PPA in any given experimental spectrum with the following results: (1) the exact channel location of the photo-peak;(2) the width of the photo-peak (FWHM);(3) the peak count rate;(4) the integrated photo-peak count rate and (5) the integrated photo-peak count rate corrected for radioactive decay to "zero-time." The mathematics involved in the analysis, the input data required, and the results of some experimental measurements, as well as some typical applications of the code are discussed. In addition, a complete FORTRAN listing with flow diagrams is given in an appendix.