1. NAME AND TITLE

FPGAM: Calculation of Fission-Product Gamma-Ray Spectra.

AUXILIARY ROUTINE

PLOT: CALCOMP plotting package.

DATA LIBRARIES

FPNL: FP Nuclide Data Generated by DCHAIN.

G-R(B-M): Gamma-Ray Data Based on Bowman-MacMurdo Data.

FPGAM is designed to accept data generated by the CCC-370/DCHAIN code package which must be requested separately.

2. CONTRIBUTOR

Japan Atomic Energy Research Institute, Tokyo, Japan.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; FACOM 230-75.

4. NATURE OF PROBLEM SOLVED

FPGAM calculates the gamma-ray spectra of fission products based upon the amount of fission product (FP) produced according to CCC-370/DCHAIN.

5. METHOD OF SOLUTION

The program takes into consideration the energy-dependent detection efficiency of the gamma-ray detectors, the Gaussian distribution of the photopeak, and the Compton dispersion spectra. The measured gamma-ray spectra can thus be directly compared with the calculated one without separating each photopeak. Compton spectra can be obtained from several single peak spectra with different photon energies and the Compton spectrum for each photopeak is interpolated about photon energy.

The calculated spectra are shown graphically.

6. RESTRICTIONS OR LIMITATIONS

The number of channels for a gamma-ray spectrum is limited to 2000. The accumulation of each nuclide must be calculated separately.

7. TYPICAL RUNNING TIME

The running time for the sample problem is less than 13 minutes.

8. COMPUTER HARDWARE REQUIREMENTS

FPGAM is operable on the FACOM 230-75 computer.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCES

a. Included in documentation:

Kanji Tasaka, "Computer Program FPGAM for Calculating Gamma-Ray Spectrum of Fission Products," JAERI-M-6898, OLS-880-244 (December 1976).

b. Background information:

W. W. Bowman and K. W. MacMurdo, "Radioactive Decay Gammas," Atomic Data and Nuclear Data Tables 13, 89 (1974).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document (10.a) and one (1.2MB) DOS diskette the source codes and sample problem input, plus output from the sample problem.

12. DATE OF ABSTRACT

February 1982; revised February 1983.