Computer Programs
CCC-0379 SHIELDOSE.
SHIELDOSE, Doses from Electron and Proton Irradiation in Space Vehicle Al Shields
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES
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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.
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.
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.
.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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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.
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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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.
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).[ top ]
CCC-0379/03
OS/MVS-SP (IBM 3084Q); VMS 4.2 (VAX-11/780); NOS-1 (CDC CYBER 740).[ top ]
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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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- G. Radiological Safety, Hazard and Accident Analysis
- J. Gamma Heating and Shield Design
Keywords: dose rates, doses, electrons, protons, shields.