1. NAME AND TITLE
ALPS: Alpha Spectrum Analysis Code System.
Japan Atomic Energy Research Institute, Tokai, Ibaraki, Japan.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; FACOM 230-75.
4. NATURE OF PROBLEM SOLVED
ALPS analyzes alpha spectra taken with solid-state detectors to extract information on the peak
intensities and energies. It was based on the gamma-ray spectrum analyzing code PSR-84/BOB73 and,
therefore, the structure is quite similar, except for the peak-fitting part.
5. METHOD OF SOLUTION
ALPS carries out the peak finding by the photopeak method, generates the line-shape function
consisting of the Gaussian and the exponential function of the first and/or second order, and
decomposes the peak compound by the function-minimizing fitting method on the basis of the above-mentioned line-shape function. The alpha line shape function is approximated with a Gaussian on the
high-energy side smoothly connected to an exponential function for the loose tail on the low-energy
side. Parameters describing the line shape function are determined separately for individual peak
compounds in the spectrum.
6. RESTRICTIONS OR LIMITATIONS
The acceptable spectrum size is up to 4100 channels, the total number of the peaks contained
should not be more than 50, and the maximum number of the peak multiplicity is 19.
7. TYPICAL RUNNING TIME
For the case of a spectrum with medium complexity, ALPS runs in less than 10 seconds.
8. COMPUTER HARDWARE REQUIREMENTS
ALPS is operable on the FACOM 230-75 computer. It uses 118 K words of storage.
9. COMPUTER SOFTWARE REQUIREMENTS
A Fortran IV compiler is required.
Hiroshi Baba,, "A Computer Program for Alpha Spectrum Analysis," Nucl. Instr. and Meth. 148 (1978) 173-178.
"Input Data Notes."
11. CONTENTS OF CODE PACKAGE
Included are the referenced documents and one (1.2MB) DOS diskette which contains the source
code and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: DATA PROCESSING, SPECTRA; GAMMA-RAY SPECTRUM ANALYSIS; UNFOLDING