1. NAME AND TITLE

ITER-2: Codes for Unfolding Activation Detector Data and Pulse Height Spectra.

AUXILIARY ROUTINE

BIN

2. CONTRIBUTOR

Jozef Stefan Institute, Ljubljana, Yugoslavia.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; CDC.

4. NATURE OF PROBLEM SOLVED

ITER-2 includes two versions of the ITER code; these are ITERAD and ITERMS. ITER-2 was previously used for unfolding data from neutron activation detectors; it is now capable, also, of unfolding pulse height spectra.

5. METHOD OF SOLUTION

ITER-2 is an iterative code which does activation detector and multispectrometer unfolding. Two simple routines are incorporated into ITER-2 to accelerate the iterative process.

6. RESTRICTIONS OR LIMITATIONS

When applied for the unfolding of 10 - 15 reaction rates, ITER-2 yields satisfactory results after about 10 - 20 iterations. Roughly 100 iterations are required when the same method is used for the multichannel spectrometer data unfolding.

If Monte Carlo runs are to be performed, random number subroutine RANSET (seed initialize) and function RANF (return uniformly distributed random number between zero and one) must be available. The CDC Fortran compiler FTN is equipped with these two subprograms.

7. TYPICAL RUNNING TIME

For the test run of the program on a CDC Cyber computer (25 iterations, 20 Monte Carlo runs with 25 iterations each, dose calculations) 4.738 CP seconds were used by the compiler, 1.536 seconds by the loader and 57.427 seconds for the execution.

8. COMPUTER HARDWARE REQUIREMENTS

ITER-2 is operable on the CDC Cyber computers. 34,525 (octal) words of core storage are required on the CDC Cyber 72 computer. It uses two mass storage files during execution.

9. COMPUTER SOFTWARE REQUIREMENTS

ITER-2 runs under he SCOPE or NOS/BE operating systems. A Fortran IV compiler is required.

10. REFERENCES

M. Pauko and M. Najzer, "Iteration Acceleration in the ITER-2 Unfolding Code," Informal Report (November 1978).

B. Glumac and M. Najzer, "Multispectrometer Unfolding by ITER Code," Informal Report (November 1978).

M. Najzer, B. Glumac, and M. Pauko, "Many Channel Spectrum Unfolding," Informal Report.

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

March 1984.