CCC-0118 SIGMA/B. (Abstract last modified 04-APR-2003)
1.
NAME OR DESIGNATION OF PROGRAM - SIGMA/B. 2.
COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -
To request or retrieve programs click on the one of the active versions below.
A password and special authorization is required. Explanation of the status codes.
Machines used:
Package-ID Orig.Computer Test Computer
CCC-0118/01 IBM 370 series IBM 370 series
3.
DESCRIPTION OF PROBLEM OR FUNCTION - SIGMA/B calculates radiation dose at arbitrary points inside a space vehicle, taking into account vehicle geometry, heterogeneous placement of equipment and stores, vehicle materials, time-weighted astronaut positions and many radi- ation sources from mission trajectories, e.g. geomagnetically trap- ped protons and electrons, solar flare particles, galactic cosmic rays and their secondary radiations. The vehicle geometry, equip- ment and supplies, and man models are described by quadric surfaces. The irradiating flux field may be anisotropic.
4.
METHOD OF SOLUTION - Automatic sectoring of the vehicle is perform- ed by a Simpson's rule integration over angle; the dose is computed by a numerical angular integration of the dose attenuation kernels about the dose points. The kernels are curve-fit functions construc- ted from input data tables.
5.
RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - The code uses vari- able dimensioning techniques to store data. The only restriction on problem size is the available core storage.
6.
TYPICAL RUNNING TIME - 7.
UNUSUAL FEATURES OF THE PROGRAM - 8.
RELATED AND AUXILIARY PROGRAMS - SIGMA/B is designed to use dose attenuation data calculated by CHARGE (CCC-0070), which in turn uses as input flux data calculated by the Monte Carlo code OGRE (CCC-0046).
9.
STATUS 10.
REFERENCES - 11.
MACHINE REQUIREMENTS - 2500 bytes on an IBM 7094, for a sample prob- lem modelling a space vehicle with 40 surfaces and 44 geometric regions.
12.
PROGRAMMING LANGUAGE(S) USED - 13.
OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - Standard 14.
OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - 15.
NAME AND ESTABLISHMENT OF AUTHOR - 16.
MATERIAL AVAILABLE - 17.
CATEGORIES - Keywords: DOSES, SPACE RADIATION
Program-name Package-ID Status
SIGMA/B CCC-0118/01 Tested
SIGMA/B CCC-0118/02 Obsolete
The code can be used to perform simultaneous dose calculations for multiple vehicle trajectories, each involving several radiation sources. Results are presented either as dose as a function of shield thickness, or the dose received through designated outer sections of the vehicle.
CCC-0118/01: 01-OCT-1977 Tested at NEADB
CCC-0118/02: 04-APR-2003 Obsolete
- T.M. Jordan:
SIGMA, A Computer Program for Space Radiation Dose Analysis Within Complex Configurations
McDonnell Douglas Report DAC-60878 (November 1967).
- W.R. Yucker:
Extended Capabilities of the SIGMA Program
McDonnell Douglas Memorandum A3-830-BBFO-121
(June 1971, revised May 1974).
CCC-0118/01:
CCC-0118/01: FORTRAN-IV
T.M. Jordan
Advanced Propulsion Department
Research Development
McDonnell Douglas Missile & Space Systems Division
Santa Monica, California, U.S.A.
CCC-0118/01:
CCC0118_01.002 SIGMA/B SOURCE - F4 EBCDIC 1627 records
CCC0118_01.003 RANDM1 SUBROUTINE - F4 EBCDIC 16 records
CCC0118_01.004 SIGMA/B JOB CONTROL 4 records
CCC0118_01.005 SIGMA/B SAMPLE PROBLEM INPUT 156 records
CCC0118_01.006 SIGMA/B SAMPLE PROBLEM OUTPUT 1243 records
- G. Radiological Safety, Hazard and Accident Analysis
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