MCNP PTRAC filters

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SUMMARY

This discussion focuses on modeling an HPGe detector to analyze downscatter contributions to Ba-133 spectra using MCNP's PTRAC filters. The user is specifically filtering scattering events within a Ta4C3 shield to refine tally 1, which measures surface fluence on the detector's front face. There is ambiguity regarding the energy parameters (E1, E2, ERG) in the PTRAC card, particularly whether they refer to particle energy at scattering or tally time. Alternative approaches using F8/F6 tallies and PHL for coincidence and anticoincidence analysis are also mentioned.

PREREQUISITES
  • Understanding of MCNP (Monte Carlo N-Particle Transport Code) version used
  • Familiarity with HPGe detector modeling and its applications
  • Knowledge of PTRAC card functionality and parameters
  • Basic concepts of F8/F6 tallies and PHL (Pulse Height Analysis)
NEXT STEPS
  • Research the specifics of MCNP PTRAC card parameters and their implications
  • Learn about F8/F6 tallies and how to implement them in MCNP
  • Explore the use of PHL for analyzing coincidence and anticoincidence events
  • Investigate the energy calibration techniques for HPGe detectors in spectral analysis
USEFUL FOR

Researchers and practitioners in nuclear physics, radiation detection, and anyone involved in modeling and analyzing detector responses using MCNP.

MadGander
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Hi all,

I'm modeling an HPGe detector and want to determine the amount of downscatter that contributes to a Ba-133 spectra. I'm using a PTRAC card to filter scattering events that occur in my Ta4C3 shield that contribute to tally 1 (surface fluence across the front face of the detector). I want to further narrow down the events down so that only particles within a certain energy range in tally 1 are considered. In my case, the manual isn't clear whether the E1, E2, ERG entry would correspond to the particle energy at the time of scattering or at the time of tally. Input deck is linked below.
 

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I get no events in the ptrac file when I run that. Is that successful for you?

I don't know ptrac. I would try to do this sort of thing using F8/F6 tallies and PHL. I don't fully understand that either, but you get coincidence and anticoincidence when done right and this can be used to plot, for example a Compton suppressed spectrum.
 

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