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CCC-0118 SIGMA/B.

SIGMA/B, Doses in Space Vehicle for Multiple Trajectories, Various Radiation Source

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1. NAME OR DESIGNATION OF PROGRAM:  SIGMA/B.
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2. COMPUTERS
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Program name Package id Status Status date
SIGMA/B CCC-0118/01 Tested 01-OCT-1977

Machines used:

Package ID Orig. computer Test computer
CCC-0118/01 IBM 370 series IBM 370 series
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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.

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.
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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.
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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.
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6. TYPICAL RUNNING TIME:
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7. UNUSUAL FEATURES OF THE PROGRAM:
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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).
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9. STATUS
Package ID Status date Status
CCC-0118/01 01-OCT-1977 Tested at NEADB
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10. REFERENCES

- 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).
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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.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
CCC-0118/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  Standard
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

T.M. Jordan
Advanced Propulsion Department
Research Development
McDonnell Douglas Missile & Space Systems Division
Santa Monica, California, U.S.A.
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16. MATERIAL AVAILABLE
CCC-0118/01
File name File description Records
CCC0118_01.002 SIGMA/B SOURCE - F4 EBCDIC 1627
CCC0118_01.003 RANDM1 SUBROUTINE - F4 EBCDIC 16
CCC0118_01.004 SIGMA/B JOB CONTROL 4
CCC0118_01.005 SIGMA/B SAMPLE PROBLEM INPUT 156
CCC0118_01.006 SIGMA/B SAMPLE PROBLEM OUTPUT 1243
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: doses, space radiation.