SIMPSF Version History

SIMPSF - COMPTEL Simulated Point-Spread-Function (PSF) Generation

• Version 12 (20-May-1998)
  Provides new task parameter to limit the smallest value of the geometry correction.
  In the course of normalizing the IAQ with the appropriate geometry factors, there were times when a very small geometry factor (<.001) could lead to spikes in, for example, the resulting PSF phibar distribution. This led to what might be termed 'noise' in the resulting PSF.
  The new version of SIMPSF solves this problem by adding a new task parameter that specifies a geometry value below which the geometry is assumed to be zero, leading to no normalization of the FAQ. The default limit of 0.001 seems to work quite well in most cases. For cases in which there is relatively poor statistics (small number of simulated events), somewhat larger values MAY be useful. This approach works extremely well for cleaning up noisy simulated PSFs.
  • Comparison of v11 PSF (IAQ-58042) versus v12 PSF (IAQ-58143) for 0.75-1.0 MeV (0 degrees)
  • Comparison of v11 PSF (IAQ-58044) versus v12 PSF (IAQ-58141) for 1.0-3.0 MeV (0 degrees)
  • Comparison of v11 PSF (IAQ-58046) versus v12 PSF (IAQ-58145) for 3.0-10.0 MeV (0 degrees)
  • Comparison of v11 PSF (IAQ-58048) versus v12 (IAQ-58147) PSF for 10.0-30.0 MeV (0 degrees)

Last Updated: May 21, 1998