NEA-1688 SACALC2B/SACALC_CYL.
SACALC_CYL, Calculates the average solid angle subtended by a volume
SACALC2B, Calculates the average solid angle for source-detector geometries
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHODS, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES, AUXILIARIES, STATUS, REFERENCES, HARDWARE REQUIREMENTS, LANGUAGE, SOFTWARE REQUIREMENTS, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| SACALC2B | NEA-1688/03 | Tested | 19-JUN-2006 |
| SACALC_CYL | NEA-1688/04 | Tested | 21-FEB-2007 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NEA-1688/03 | IBM PC,PC Windows | PC Windows |
| NEA-1688/04 | IBM PC,PC Windows | PC Windows |
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3. DESCRIPTION OF PROGRAM OR FUNCTION
SACALC2B calculates the average solid angle subtended by a rectangular or circular detector window to a coaxial or non-coaxial rectangular, circular or point source, including where the source and detector planes are not parallel.
SACALC_CYL calculates the average solid angle subtended by a cylinder to a rectangular or circular source, plane or thick, at any location and orientation. This is needed, for example, in calculating the intrinsic gamma efficiency of a detector such as a GM tube. The program also calculates the number of hits on the cylinder side and on each end, and the average path length through the detector volume (assuming no scattering or absorption). Point sources can be modelled by using a circular source of zero radius.
SACALC2B calculates the average solid angle subtended by a rectangular or circular detector window to a coaxial or non-coaxial rectangular, circular or point source, including where the source and detector planes are not parallel.
SACALC_CYL calculates the average solid angle subtended by a cylinder to a rectangular or circular source, plane or thick, at any location and orientation. This is needed, for example, in calculating the intrinsic gamma efficiency of a detector such as a GM tube. The program also calculates the number of hits on the cylinder side and on each end, and the average path length through the detector volume (assuming no scattering or absorption). Point sources can be modelled by using a circular source of zero radius.
NEA-1688/03
Documentation has been updated (January 2006).[ top ]
4. METHODS
The program uses a Monte Carlo method to calculate average solid angle for source-detector geometries that are difficult to analyse by analytical methods. The values of solid angle are calculated to accuracies of typically better than 0.1%. The calculated values from the Monte Carlo method agree closely with those produced by polygon approximation and numerical integration by Gardner and Verghese, and others.
The program uses a Monte Carlo method to calculate average solid angle for source-detector geometries that are difficult to analyse by analytical methods. The values of solid angle are calculated to accuracies of typically better than 0.1%. The calculated values from the Monte Carlo method agree closely with those produced by polygon approximation and numerical integration by Gardner and Verghese, and others.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
The program models a circular or rectangular detector in planes that are not necessarily coaxial, nor parallel. Point sources can be modelled by using a circular source of zero radius. The sources are assumed to be uniformly distributed.
The program models a circular or rectangular detector in planes that are not necessarily coaxial, nor parallel. Point sources can be modelled by using a circular source of zero radius. The sources are assumed to be uniformly distributed.
NEA-1688/04
In SACALC_CYL, to avoid rounding errors, differences less than 1e-12 are assumed to be zero.[ top ]
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| Package ID | Status date | Status |
|---|---|---|
| NEA-1688/03 | 19-JUN-2006 | Tested at NEADB |
| NEA-1688/04 | 21-FEB-2007 | Tested at NEADB |
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10. REFERENCES
- R. Whitcher:
Calculation of the average solid angle subtended by a detector to source in a parallel plane by a Monte Carlo method (Rad. Prot. Dosimetry 102 (4) pp365-369. 2002)
- The use of a Monte Carlo method to calculate the average solid angle subtended by a detector to source in a non-parallel plane (Radiation Protection Dosimetry 2003 104(2):167-171)
- R. Whitcher:
A Monte Carlo Method to Calculate the Average Solid Angle Subtended by a Right Cylinder to a Source that is Circular or Rectangular, Plane or Thick, at any Position and Orientation (Radiation Protection Dosimetry 2006 118(4):459-474)
- R. Whitcher:
Calculation of the average solid angle subtended by a detector to source in a parallel plane by a Monte Carlo method (Rad. Prot. Dosimetry 102 (4) pp365-369. 2002)
- The use of a Monte Carlo method to calculate the average solid angle subtended by a detector to source in a non-parallel plane (Radiation Protection Dosimetry 2003 104(2):167-171)
- R. Whitcher:
A Monte Carlo Method to Calculate the Average Solid Angle Subtended by a Right Cylinder to a Source that is Circular or Rectangular, Plane or Thick, at any Position and Orientation (Radiation Protection Dosimetry 2006 118(4):459-474)
NEA-1688/03, included references:
- R. Whitcher:SACALC2B How to Use (January 2006)
NEA-1688/04, included references:
- R. Whitcher:SACALC_CYL How to Use (October 2006)
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| Package ID | Computer language |
|---|---|
| NEA-1688/03 | DELPHI V4 |
| NEA-1688/04 | DELPHI V4 |
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NEA-1688/03
SACALC2.EXE Executable to run the SACALC2 codeSACALC2 Documentation both in Word and PDF Formats
Readme.txt Readme file
7 source files
NEA-1688/04
SACALC_CYL.doc manualsacalc_cyl.exe executable file
Keywords: Monte Carlo method, detectors, source.