NEA-0584 GFX/GAMP1.

GFX/GAMP1, Above-Ground Radiation Field from Terrestrial K, U, Th Gamma Emitters

NAME, COMPUTER, PROBLEM, SOLUTION, RESTRICTIONS, CPU, FEATURES, AUXILIARIES, STATUS, REFERENCES, LANGUAGE, AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM

GFX/GAMP1.

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2. COMPUTERS

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Program name	Package id	Status	Status date
GFX/GAMP1	NEA-0584/01	Tested	01-SEP-1980

Machines used:

Package ID	Orig. computer	Test computer
NEA-0584/01	IBM 3033	IBM 3033

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3. DESCRIPTION OF PROGRAM OR FUNCTION

GFX/GAMP1 is a program system for computation of the terrestial gamma-radiation field. The complete data processing system with programs and files is called GB. The main FORTRAN programmes are 'GAMP1' and 'GFX'.

Solution of the plane one- dimensional photon transport equation in the case of two adjacent media. One medium represents a natural ground with uniformly distributed potassium, uranium or thorium gamma-ray emitters. The other medium is usually air with no radioactive contaminants.

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4. METHODS

GB, a system of computer programs intended for solution of the plane one-dimensional photon transport equation in the case of two adjacent media is described, and user's guide for the programs is given. One medium represents a natural ground with uniformly distributed potassium, uranium and thorium gamma-ray emitters. The other medium is usually air with no radioactive contaminants. The solution method is the double-P1 approximation with logarithmic energy spacing. The complete data-processing system 'GB' contains the transport theory code GAMP1, the code GFX for computation of scalar flux and dose rate, and a number of auxiliary programs and data files. Both wavelength and spatial integration are done semi-analytically. A logarithmic wavelength mesh is used. Spatial equations are approximated by aid of a semi-linear least squares technique.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum number of emission lines per radionuclide = 100. Apart from this, all arrays are programmed with adjustable dimensions, and the total allocated storage can be changed by altering a single array bound.

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6. TYPICAL RUNNING TIME

GAMP1 requires about 200 sec B6700 CPU-time (this would correspond to about 25 sec for IBM 370) to produce the complete radiation field for one radioelement, with the recommended standard input parameters of the test case. The other programs in GB are faster than GAMP1.

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7. UNUSUAL FEATURES OF THE PROGRAM

The overall logarithmic wavelength mesh is considered as the most unusual feature of GAMP1 as compared to other gamma-ray transport codes. Although designed for the natural gamma-radiation field, the code could probably (after a few modifications) be of value also for shielding calculations.

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8. RELATED OR AUXILIARY PROGRAMS

The program system GB consists of a number of data files and the following 6 FORTRAN programs:

GAMP1 transport theory program.
GFX flux and dose program.
UPDATE updates the material data file.
PRINT prints a catalog of the material data file.
CROS computes gamma-ray cross-sections for a material.
DEEPFLUX limiting one medium form of GAMP1.

A detailed description of the programmes is given in the reference.

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9. STATUS

Package ID	Status date	Status
NEA-0584/01	01-SEP-1980	Tested at NEADB

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10. REFERENCES

P. Kirkegaard and L. Loevborg:
Program System for Computation of the Terrestial Gamma Radiation Field Risoe Report no 393 (1979).

NEA-0584/01, included references:

- P. Kirkegaard and L. Loevborg:
Program System for Computation of the Terrestial Gamma Radiation Field
Risoe-R-392 (1979)

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0584/01	FORTRAN-IV

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15. NAME AND ESTABLISHMENT OF AUTHORS

   P. Kirkegaard and L. Loevborg
   Risoe National Laboratory
   DK-4000 Roskilde
   Denmark

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16. MATERIAL AVAILABLE

NEA-0584/01

File name	File description	Records
NEA0584_01.001	INFORMATION	45
NEA0584_01.002	JCL AT NEA	130
NEA0584_01.003	INSTRUCTION OF TEST CASE	25
NEA0584_01.004	GAMP1 SOURCE (F4,EBCDIC)	740
NEA0584_01.005	GFX SOURCE (F4,EBCDIC)	314
NEA0584_01.006	UPDATE SOURCE (F4,EBCDIC)	348
NEA0584_01.007	PRINT SOURCE (F4,EBCDIC)	124
NEA0584_01.008	CROS SOURCE (F4,EBCDIC)	70
NEA0584_01.009	DEEPFLUX SOURCE (F4,EBCDIC)	238
NEA0584_01.010	AUXILIARY ROUTINES	358
NEA0584_01.011	IDAY ROUTINE (ASSEMBLER)	155
NEA0584_01.012	MCMASTER (LIVERMORE GAMMA-RAY X-SEC DATA)	9601
NEA0584_01.013	EMITTERS(EMISSION DATA FOR THE RADIOELEMENT)	190
NEA0584_01.014	MATERIALS1 (BEFORE UPDATING)	126
NEA0584_01.015	MATERIALS2 (AFTER UPDATING)	220
NEA0584_01.016	TEST INPUT DATA FOR ALL THE PRoGRAMS	56
NEA0584_01.017	PRINTED OUTPUT OF GAMP1	218
NEA0584_01.018	PRINTED OUTPUT OF GFX (2-MEDIA PROBLEM)	24
NEA0584_01.019	PRINTED OUTPUT OF DEEPFLUX	179
NEA0584_01.020	PRINTED OUTPUT OF GFX (DEEPFLUX SITUATION)	26
NEA0584_01.021	PRINTED OUTPUT OF UPDATE	52
NEA0584_01.022	PRINTED OUTPUT OF PRINT	31
NEA0584_01.023	PRINTED OUTPUT OF CROS	12

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17. CATEGORIES

J. Gamma Heating and Shield Design
R. Environmental and Earth Sciences

Keywords: cross sections, doses, gamma radiation, one-dimensional, photon transport, transport theory.