CCC-0083 RAID.

1. NAME OR DESIGNATION OF PROGRAM:  RAID.
Monte Carlo Multibend Shielding Code.

3. DESCRIPTION OF PROGRAM OR FUNCTION

RAID evaluates the energy, angular distribution, and intensity of either the scattered neutron  or gamma-ray flux that penetrates a straight cylindrical or a multibend duct. A neutron or gamma-ray source may be described with  a set of from 1 to 30 point sources. The energy and angular distribution and the intensity of the scattered flux are calculated  for each set of from 1 to 30 detector points.

4. METHOD OF SOLUTION

The Monte Carlo method represents a Neumann series solution of the integral transport equation. Included in the  sampling techniques are splitting, Russian Roulette, statistical estimation, and a method of importance sampling in the source angular distribution.
The code provides for the calculation of the energy and angular distribution of the scattered neutron or gamma-ray flux, the total scattered neutron or gamma-ray flux and dose rates, and the unscattered neutron or gamma-ray flux and dose rate.
A library of cross sections which can be easily changed is packaged with the code.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

There are no known restrictions implied by storage allocation or argument range due to  approximations.

6. TYPICAL RUNNING TIME:

The test case has been executed by NEA-DB on an IBM3083 computer in 0.8 seconds of CPU time.

7. UNUSUAL FEATURES OF THE PROGRAM

The code has been used in the analysis of the gamma radiation environment above a fallout field, where the effect of the air-ground interface is taken into account.
The geometry routine is sufficiently flexible for the description of many of the shield configurations encountered in reactor, weapon, and space shielding.

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- J.A. Moore, J.B. Eggen and F.O. Leopard:
  Monte Carlo Procedure for Analysis of Radiation in Ducts (RAID).
  AFWL-TR 67-9  (August 1967)

11. MACHINE REQUIREMENTS:

To run the test case included in this package on an IBM 3083, 520K bytes of main storage are required.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

MVS/XA with compiler VS FORTRAN level 2.3.0 (IBM 3083).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Developed by:
                USAF Nuclear Aerospace Research Facility (NARF)
                General Dynamics
                Fort Worth, Texas, U. S. A.
Contributed by:
                Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

File name	File description	Records
CCC0083_01.001	Information file	97
CCC0083_01.002	RAID source file	5153
CCC0083_01.003	Simulator for SLITE and SLITET	14
CCC0083_01.004	Sample data	687
CCC0083_01.005	JCL used at Data Bank	25
CCC0083_01.006	Sample output by the Data Bank	380
CCC0083_01.007	Sample output by the author	217