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CCC-0379 SHIELDOSE.

SHIELDOSE, Doses from Electron and Proton Irradiation in Space Vehicle Al Shields

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1. NAME OR DESIGNATION OF PROGRAM:  SHIELDOSE.
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2. COMPUTERS
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Program name Package id Status Status date
SHIELDOSE CCC-0379/03 Tested 09-APR-1986

Machines used:

Package ID Orig. computer Test computer
CCC-0379/03 IBM 360 series Many Computers
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3. DESCRIPTION OF PROBLEM OR FUNCTION

The ability to predict absorbed dose within a spacecraft due to a specified radiation environment is important for design and planning considerations pertaining to the reliability of electronic components and to the radiological safety  of on-board personnel. This computer code SHIELDOSE evaluates the absorbed dose as a function of depth in aluminum shielding material  of spacecraft, given the electron and proton fluences encountered in orbit.
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4. METHOD OF SOLUTION

It makes use of pre-calculated, monoenergetic depth-dose data for an isotropic, broad-beam fluence of radiation incident on uniform aluminum plane media. Such data are particularly suitable for routine dose predictions in situations where the geometrical and compositional complexities of the spacecraft are not known. Furthermore, restricting our consideration to these rather simple geometries has allowed for the development of accurate electron and electron-bremsstrahlung data sets based on detailed transport calculations rather than on more approximate methods. The  present version of SHIELDOSE calculates, for arbitrary proton and electron incident spectra, the dose absorbed in small volumes of the detector materials Al, H2O (tissue-equivalent detector), Si and SiO2, in the following aluminum shield geometries: (1) in a semi- infinite plane medium, as a function of depth; (2) at the transmission surface of a plane slab, as a function of slab thickness; and (3) at the center of a solid sphere, as a function of sphere radius.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

.No. of depth Z for which dose calculation is desired (IMAX) <=50
.No. of prints used in the numerical evaluation of the integral over  the incident proton spectrum (NPTSP) <=301
.No. of points used in the numerical evaluation of the internal over  the incident electron spectrum (NPTSE) <=101
.No. of energy for which the solar-flare-proton spectrum is read in  (JSMAX), incident trapped-proton spectrum is read in (JPMAX) and incident electron spectrum is read in (JEMAX) <=101, respectively.
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6. TYPICAL RUNNING TIME:  The sample problem ran 8 sec. on the IBM 370/ 195.
CCC-0379/03
NEA-DB executed the test case included in this package  on different machines. The following CPU times were required:
2.6 seconds( IBM 3081); 33.6 seconds (VAX11/780); 44.7 seconds (CDC  CYBER 740).
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7. UNUSUAL FEATURES OF THE PROGRAM

It is, in general, necessary to suppress underflow diagnostics which interrupt, and can eventually terminate, a run. Underflow conditions are not detected by the code  itself and should therefore be suppressed using the appropriate options available at the particular computing installation. For the  IBM system used by the author, this is accomplished by the "CALL ERRSET" instruction at the beginning of the main.
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
CCC-0379/03 09-APR-1986 Tested at NEADB
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10. REFERENCES:
CCC-0379/03, included references:
- S. Seltzer :
  SHIELDOSE: A Computer Code for Space-shielding Radiation
  Dose Calculations
  NBS Technical Note 1116 (May 1980)
- S. Seltzer :
  Addendum to NBS Technical Note 1116, "SHIELDOSE: A Computer Code
  for Space-shielding Radiation Dose Calculations"
  (February 1984)
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11. MACHINE REQUIREMENTS

Approximately 310K bytes of core memory and one disk storage unit (20 tracks) for depth-dose data are required.
CCC-0379/03
To run the test case, the following main storage was required: 372K bytes (IBM 3081); 783 pages (VAX-11/780); 230,000 (octal) words (CDC CYBER 740).
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
CCC-0379/03 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS/370.
CCC-0379/03
OS/MVS-SP (IBM 3084Q); VMS 4.2 (VAX-11/780); NOS-1 (CDC CYBER 740).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

Stephen Seltzer
Center of Radiation Research
National Measurement Laboratory
National Bureau of Standards
Washington, DC 20234
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16. MATERIAL AVAILABLE
CCC-0379/03
File name File description Records
CCC0379_03.001 INFORMATION FILE 85
CCC0379_03.002 JOB CONTROL FOR IBM 91
CCC0379_03.003 JOB CONTROL FOR VAX 15
CCC0379_03.004 JOB CONTROL FOR CDC 15
CCC0379_03.005 DEPTH DOSE DATA LIBRARY (UNIT 9) 2083
CCC0379_03.006 SHIELDOSE SOURCE (FORTRAN-77) 618
CCC0379_03.007 SHIELDOSE SAMPLE PROBLEM INPUT DATA 24
CCC0379_03.008 SHIELDOSE SAMPLE PROBLEM OUTPUT DATA(VAX) 274
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • J. Gamma Heating and Shield Design

Keywords: dose rates, doses, electrons, protons, shields.