NEA-1353 ALBEDO/ALBEZ.

1. NAME OR DESIGNATION OF PROGRAM:  ALBEDO/ALBEZ.
(Programs for the calculation of the attenuation of radiation in
single and double bends).

3. DESCRIPTION OF PROGRAM OR FUNCTION

The programs ALBEDO and ALBEZ are used to calculate the attenuation of scattered radiation in straight or bent air ducts for gamma radiation (0.1-3 MeV) and fast  neutrons (0.1-14 MeV). With the programs the following geometries can be treated:
- ALBEDO: straight ducts and ducts with one bend
-  ALBEZ: ducts with two bends.

4. METHOD OF SOLUTION

In the case of gamma radiation the calculations are based on the Compton effect. The energy and angle dependency of  the energy of the scattered photons and the albedo factors for the scattering is based on generally available literature.
In the case of neutrons the programs are valid only for fast neutrons. This is the range of validity of the albedo factors in the literature which describe the energy and angle dependencies of the scattered fast neutrons. The loss of energy of the neutrons due to scattering at the surface is neglected.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The programs are restricted for gamma radiation to the energy range of 0.1 to 3 MeV.  In the case of neutrons only fast neutrons can be treated in the range of 0.1 to 14 MeV. Furthermore, the albedos used in the codes are valid only for concrete ducts.

6. TYPICAL RUNNING TIME

Running time is strongly dependent on the division of source surface, scattering surfaces and receptor surface. Times can be as low as a few minutes. In the case of a very fine division of surfaces the running time could easily be an hour.  Running time is also dependent on the speed of the PC.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- A. Baran and M. Gruen:
  ALBEDO,ALBEZ - PC-Programs for the Calculation of the Attenuation
  of Radiation in Single and Double Bends
  (January 10, 1990).

11. MACHINE REQUIREMENTS

IBM-PC or compatible, mathematical coprocessor not required; code size would allow execution on a AT with 1.2 MB disk drive without a hard disk, but a hard disk is recommended.
NEA 1353/01: NEA-DB compiled the programs and executed the test cases included in this package on a PC/0386 with 80387 math- co-processor.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The code was developed using Microsoft FORTRAN 5.0 without use of a mathematical  coprocessor. The original system for the development was HP DOS 3.3. Code also runs on PC DOS and MS DOS.
NEA 1353/01: The programs were compiled with the Microsoft FORTRAN version 5.0 compiler running under MS-DOS 4.01.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

          NUKEM GmbH
          Geschaeftsgebiet Sicherheitstechnik
          Industriestr. 13
          D-8755 Alzenau, Federal Republic of Germany

File name	File description	Records
NEA1353_01.001	Information file	61
NEA1353_01.002	Command file to compile and link ALBEDO	1
NEA1353_01.003	Command file to compile and link ALBEZ	1
NEA1353_01.004	ALBEDO Source file	616
NEA1353_01.005	ALBEZ Source file	585
NEA1353_01.006	ALBEDO input file	38
NEA1353_01.007	ALBEZ input file	58
NEA1353_01.008	ALBEDO output file	216
NEA1353_01.009	ALBEZ output file	653
NEA1353_01.010	ALBEDO executable file	0
NEA1353_01.011	ALBEZ executable file	0
NEA1353_01.012	DOS file-names	11